Sigma Test and Research Centre

header photo

Blog Posts

Importance of Shoe Testing

A myriad of strict rules and regulations governs the import, export and selling of footwear in the global markets, especially to the developed nation of the world. The rules and regulations imposed help in protecting the customers, clothing brands and the environment. The European Union along with most other countries having healthy consumer markets enforce similar trade laws and legislation concerning the methods of testing footwear as well as controlling the quality of the products.


The manufacturing, supplying and retailing units must ensure that their products meet the requirements of commercial departments as well as those of the health authorities of the countries where they choose to sell their products. A footwear company can have its markets in the EU, the UAE, Asia, and the US, Japan, Australia or any other countries of the world. But, they need to prove that they carried out the testing and met the legal requirements of the destination markets. However, if they fail to do so, the authorities reject their shipment and the firm might have to face penalties above the cost of manufacturing the footwear.

Footwear and Shoes Certifications, Licenses and Accreditations

Depending on the footwear and shoes products, the manufacturers might need a third party Footwear and Shoes laboratories or research facilities with specific certifications, licenses and accreditations. These include:


Laws and Regulations Related to Footwear


All these above-mentioned laws and regulations require third party testing of footwear for ensuring that the products meet all the requirements. Each of the laboratories in India carries out different types of tests that require the footwear to qualify for the appropriate certification pertaining to the regulations of each country.

The requirements might differ for footwear designed for children and for the workplace, compared to those intended for the average adult consumer. Moreover, various agencies take the responsibility for specific aspects of the legislation. Each country has its own agencies, which oversee the directives and the necessary footwear testing requirements.

For instance, footwear compliance requirements for The United States fall under the following agencies and departments:



Consumer Product Safety Commission (CPSC)

Children’s footwear; hazardous substances

Customs and Border Protection (CBP)

Country of the origin for most imported products

Federal Trade Commission (FTC)


Occupational Health and Safety Administration (OSHA)

Protective footwear

United States Department of Agriculture (USDA)

Organic claims


Protection of Intellectual Property Rights for Footwear and Clothing Brands in Europe

The European Observatory on Infringement of Intellectual Property Rights long with the Organization for Economic Co-operation and Development (OECD) act as the watchdogs for illicit trade in counterfeit goods. Both the organizations monitor all forms of transport and shipment of goods, from small parcel services to container services into the European Union (EU).

Counterfeit footwear is among the top-ranking illicit goods seized by European customs departments, and numerous court cases against the importers over the past few years.

Consumer Health and Environmental Protection- Chemical Testing of Footwear

Testing footwear for chemicals used in manufacturing and shipping is the most essential step that manufacturers and suppliers must conduct. The step ensures that their products would satisfy their consumer health and safety regulations regarding the restrictions of using certain toxic chemicals.

REACH Restrictions on Chemicals in Footwear

The footwear industry uses more than 20 toxic aromatic amines derived from Azo dyes while they manufacture the fabrics for footwear and other textiles. The EU’s REACH directives severely restrict the use of these dyes and amines. They stated the limit for the aromatic amines as 30 mg per kilogram, which is 0.003% by weight for each article.

DMF Testing for Footwear

Dimethyl fumarate (DMF) is a volatile chemical commonly added to desiccant sachets or silica bags placed in footwear packaging by the manufacturers as an antifungal agent. The addition of silica bags in the footwear prevents the growth of moulds on the product while storing and transporting them.

However, due to the toxicity- DMF cause allergic reactions, acute eczema and skin burns. The EU market under Directive 2009/251/EC bans the use of silica bags or DMF in footwear. Hence, suppliers of footwear to EU markets must carry out DMF tests on sample products. The test will ensure that there are no traces of DMF found in the products. It also helps in avoiding the risk of product recalls or rejection by EU customers and health authorities.

Product Composition and Labelling Requirements

Testing Fiber Authenticity

The products labels meant for clothes, shoes and other items will come in close contact with the skin must contain accurate information about the composition of the materials used in the manufacturing of the products. The manufacturers need to distinguish and label the natural and synthetic fibres especially for leather, cotton, wool, silk, linen, nylon polyester and others.

With the testing and certifications of the shoes and other leather products, the manufacturers exporting their products to others of the world can strengthen their confidence in the quality and safety of their products. The neutral and intentionally recognized test mark demonstrates the manufacturer’s compliance with legal regulations and voluntary requirements regarding harmful substances and quality to provide the customers with the extra security that they look for while purchasing footwear and other leather products.


If you wish to know more about Sigma Laboratory or Shoe Testing, you can visit their official website- Sigmatest or you can contact them on- +91-9560222333. You can also visit Sigma’s Regd. Office at- 99, Phase 2, Badli Industrial Area, New Delhi-110042.  

What is reach testing? and What is reach compliance testing?

What is REACH testing?

Reach testing is a European testing standard that has been devised keeping in mind the safety requirements of human and environmental well being. It specifies a list of materials that must be tested for any potential risk to its consumers and to the environment in general, it entails subsequent testing for Plastic products, Chemicals, Metals and metal articles, Toys, Packaging material, Coated Material, Finished Goods, Paint with other products apart from the above-mentioned categories of commodities. 

Due to concerns related to producer accountability on the use of hazardous substances, reach testing services are provided by reach testing laboratories giving in-depth analysis of safety concerns related to the substances which might violate the guidelines prescribed in the REACH manual.


REACH stands for Registration, Evaluation, Authorization and Restriction of  Chemicals.


The fundamental of Reach works upon building a responsible attitude towards substances that are unfit from human and environmental degradation point of view and gradually discarding such substances by replacing them with alternatives that are more consumer and environment friendly. This attitude will not only help in reaping long term benefits of sustainable growth but will also be a step towards disposing of the social responsibility on the producers. 



The Regulation holds the producers accountable for ensuring that the substances used in consumer durables satisfy quality standards and are thereafter disposed of off safely, keeping the health of the environment intact, it rules the possibility of replacing the most dangerous chemicals (referred to as "substances of very high concern") as and when suitable alternatives are identified.


These standards mandated by the European Union have greater benefits to producers who comply by these since companies are becoming more and more competitive both domestically and globally henceforth there is an ardent need for producers to not fall in the regulatory purview of regulatory bodies and towards greater benefits of increased customer reach due to the responsible behaviour exhibited by such companies.


What is reach compliance testing? 


Reach compliance testing involves ascertaining the chemical composition of certain substances above the prescribed limits, even though it was a legislation that was followed throughout the European Union but now it has a global effect, it enables manufacturers to enter the EU market without worrying about fines and additional hassles.


The REACH regulation contains information regarding substances that are under scrutiny from Annex XVII (Restricted Substances such as 3 phthalates for toys and 6 phthalates for toys) when the toy can be placed in the mouth by children to the list of SVHC's or substances of very high concern, it is while conforming to these guidelines, that producer must ensure that products do not contain regulated substances above the legal limit, therefore a third party test is advisable for manufacturers.


Sigma Test and Research Center is a NABL accredited laboratory. We are providing you all types of testing services like Toy Testing, Reach Testing, Food Testing, Non-Destructive Testing, Drinking Water Testing, Oil Testing etc. at very good rates. Book your test with a Sigma certified lab.


Search now for a wide array of reach tests performed scientifically by industry experts. Our lab support ensures optimum satisfaction and coverage of all safety guidelines issued by Indian and international food safety organisations.


Have a query? Get in touch and clear all hassles! Call the Sigma team at 9560222333. 


What are the differences between REACH and RoHS?

Companies operating in the European Union need to abide by the laws such as REACH and RoHS. There are some similarities, but they also possess fundamental differences. So first let us focus on REACH.

REACH is the acronym for Registration, Evaluation, Authorization, and Restriction of Chemicals. It entered into force on June 1, 2007. REACH is a regulation of the European Union, which is adopted to improve the protection of human health and the environment from the daily-life risks that can be posed by chemicals while enhancing the competitiveness of the EU chemicals industry. It also promotes alternative methods for the hazard assessment of substances to reduce the number of tests on animals.

This regulation applies to all chemical substances; REACH not only guides the chemical which is used in the industries but also to those which are used by us in our daily lives, for example in cleaning products, paints as well as in articles such as clothes, furniture, and electrical appliances. Therefore, this regulation has a huge impact on most companies across the EU and it changed the lifestyle of the people.

REACH has several aims:

To provide a high level of protection of human health and the environment from the use of chemicals.

To make the people who place chemicals on the market (manufacturers and importers responsible for understanding and managing the risks associated with their use.)

To allow the free movement of substances on the EU market.

To enhance innovation in and the competitiveness of the EU chemicals industry.

To promote the use of alternative methods for the assessment of the hazardous properties of substances.

REACH applies to substances that are manufactured or imported into the EU in quantities of 1 tonne or more per year. Generally, this regulation is applied to all individual chemical substances on their own, in preparations or articles.

Some substances are specifically excluded:

Radioactive substances

Substances under customs supervision

The transport of substances

Non-isolated intermediates


Some naturally occurring low-hazard substances

Coming forward to RoHS (Reduction of Hazardous Substances) which directs on the restriction of the use of certain hazardous substances in electrical and electronic equipment, this directive was adopted in February 2003 by the European Union to protect both people and the environment from hazardous chemicals found in both electronics and electrical products.

The legislation’s primary purpose is to make electronics manufacturing safer at every stage of an electronic device’s life cycle. Of course, there are individuals and even large-scale distributors who continue to use non-RoHS parts which are completely illegal in the state, this is because RoHS compliance can be difficult to follow it completely as the devices generally may be inconvenient and expensive even at the governmental level.

Since July 1, 2006, all electrical and electronic products to be sold within the European Union must follow the RoHS materials requirements. You’ve likely heard RoHS referred to as the “lead-free directive”, but it restricts the use of six different materials, and lists their allowable levels in parts per million (ppm):

Lead: Lead is primarily used in the production of batteries, televisions, and computer monitors. RoHS restricts the use of lead to 1000ppm.

Mercury: Mercury has been used in the manufacture of fluorescent lamps, mercury- vapour lamps, printed circuitry, aluminium electroplating, thermostats, and fuel cells. The RoHS directive limits the use of mercury to 100ppm.

Cadmium: Cadmium, which has been limited by RoHS to 100ppm, can act as a stabilizer for some plastics, and is used in cadmium/nickel batteries, electroplating, pigment production, solders, brazing alloys, alarm systems, automatic sprinklers and nuclear shielding.

Hexavalent Chromium: Hexavalent chromium, which is used in photography, paints, plastics, and stainless steel products, is limited by RoHS to a level of no more than 1000ppm.

Polybrominated biphenyls (PBB): Polybrominated biphenyls, which are used in flame- retardants, plastic foams, and certain plastics used in home electrical appliances, have been limited by RoHS to 1000ppm.

Polybrominated diphenyl ethers (PBDE): Polybrominated diphenyl ethers are used in household electronics, printed circuit boards, and capacitors. RoHS limits the use of PBDE to 1000ppm.

Therefore, the main difference between RoHS and REACH is that RoHS prohibits hazardous substances that are present in electrical and electronic equipment that is within the directive. REACH, however, pertains to all chemicals including those used to make a product. This can include harmful materials, solvents, paints, chemicals, and more.

REACH is much broader in scope than RoHS, while RoHS covers the hazardous materials and focuses on those used in the manufacturing of electronics whereas REACH targets and controls the usage of thousands of harmful substances and is not limited to the electronics industry. For instance, cars, toys, furniture, and even clothing can be subjected to REACH provisions. By now we are pretty much clear about that though REACH and RoHS are different things, it is very essential in our daily lives to keep us protected from the harmful substances around us.

Have a query? Get in touch and clear all hassles! Call the Sigma team at 9560222333. 

What is food packaging testing?

Food Packaging

Post the breakthroughs in the packaged food industry and home food delivery services that have become the norm today, the demand for packaged food has risen dramatically. Due to the online food delivery mechanisms that are cost-efficient, convenient and enticing to the tongue, the trend for packaged food habits has been adopted by one and all which has, in turn, raised concerns regarding food packaging standards in India and abroad.

How a particular food item will be packed depends upon the nature, perishability and lifetime of the product, it is said that it is the packaging that impresses the consumers first and not the taste but packaging necessarily doesn't mean in the aesthetic appeal of the product but it signifies the quality of packaging in which the product is handed for disposal to the customer.

Food Quality

There is a great deal of research that has been put to what materials must be used to pack a particular food item in a particular way so that it remains in its best form for a maximum period of time and does not react with the flavours of the food items which can lead to the food becoming toxic for human consumption. Since food items are subject to many quality and hygiene checks, several regulatory organisations have also issued specific guidelines that must be followed by producers while determining standard packaging procedures. Henceforth, testing the quality of such packaging becomes essential and in this process, the task of food packaging laboratories comes into play.

Food Packaging Laboratories

Food packaging laboratories conduct specific tests by using food samples and packaging material to measure the viability of the packaging to sustain the food item inside it in the most effective way. Packaging testing ensures that the packaging material provides sufficient insights for protection from microorganisms to enter the product, it also provides safety, durability, spill protection guidance in terms of liquid food items and in the maintenance of standards of hygiene.

Food Chemical Testing

Chemical testing is conducted by labs on foods that have direct contact with plastics or foils or other high contact materials in which the item is contained for reactive results to ascertain if exposure to a certain material does not make the food unfit for consumption.

Several gases are also used in packaging food items such as chips, packed vegetables and drinks which must not be harmful to human health, hence a comprehensive evaluation of all these variables is a necessity before releasing the product out in the market, several companies today are known for their quality since it always maintains consumers trust on the product for a long period since quality and hygiene are the fundamental concerns of any consumer.

Food packaging material testing services near you can be availed by simply typing in your location and service required for tailormade tests as per producer requirements.

Sigma is a NABL and FSSAI accredited laboratory for Food Packaging testing. Search now for a wide array of Food Packaging tests performed scientifically by industry experts. Our lab support ensures optimum satisfaction and coverage of all safety guidelines issued by Indian and international food safety organisations.

Have a query? Get in touch and clear all hassles! Call the Sigma team at 9560222333. 

Top 5 Hygiene Tips for Food Safety

Food safety and hygiene are essential and critical parts of healthy eating habits. It is an integral part of living healthy. Not only that, maintaining food quality is as necessary as maintaining the proper diet. After all, you do want to become fit, but not at the cost of food poisoning, right. So what can you possibly do to keep what you eat healthily? Here are five quick tips that can save you from bad poisoning and provide you with a more sustainable healthier goal. Read on to find out!


1. Know the food you are buying.

The place you are buying food from is equally important when it comes to hygiene and quality. Make sure that the place is itself clean and hygienic, and the food is fresh. If you are buying packaged food then make sure that they are properly labelled and come from a trusted source. The package should have relevant labels certifying the quality and inspection certifications as well. If you do not trust the source then simply do not buy it. Remember hygiene in food production is directly proportionate to your personal safety measures.

2. Pay heed to proper storage norms for food safety.

Properly wash the market-bought vegetables and fruits and refrigerate them to prevent them from rotting. Even for packaged food, the first step to your personal hygiene is to maintain proper storage. Establish a clean pantry in your kitchen. Make use of different airtight clean containers to store your pulses, legumes and spices.

Storing these things in proper containers will not only make your kitchen and pantry more organized but will also provide you with a clean and tidy environment that will be healthy for you and your family in the end. Never keep your food open or uncovered. Make inspections from time to time to make sure that the quality is up to the mark.

3. Use well-sanitized kitchenware.

The plates you are eating on are as important as the food that you are eating when it comes to overall hygiene. Make sure that all the utensils you are using for food preparation, cooking as well as eating are properly washed and sanitized. The cutlery is important too. Wash them, make them completely dry, and then put them away in dry and clean storage space. Space should be well covered, yet with particular ventilation to prevent dampness and accumulation of fungi.

If you are storing your utensils in an open space, then pay attention to the fact that they are washed before using. Even the containers that we talked about must be completely clean with zero dampness. They must be airtight and should always be properly closed after each use. Avoid using plastic containers. Glass containers are particularly nice when it comes to food safety and hygiene.

4. Properly disinfect your kitchen, pantry and dining area.

Using industrial products is a good idea. But you have to keep in mind to not use them directly around food or utensils. Maintain different sets of fresh hand-towels for your kitchen. Always keep the kitchen-top clean. Clean the chimney, the microwave and the refrigerator. Maintain a closed dustbin and never forget to dispose of the trash properly. Do not use detergents to clean the utensils. Instead, use only those soaps that are specifically designed for the purpose.

5. Maintain personal hygiene.

Yes. Personal hygiene is also an important aspect of food safety and hygiene. All your hard work in maintaining the quality can be damaged if you simply forget to wash your hands before food preparation, or before eating. While cooking and food preparation, always wear an apron and keep a fresh, clean hand-towel handy. Pay attention to your overall appearance and hygiene. It is preferable if you wear a net cap, mask and gloves for better prevention and maintenance. Always touch your food with clean hands.

Last but definitely not the least; do not forget to follow all the above points! Each point is important if you want to maintain food safety and hygiene. Moreover, following these simple tips may also make your quality even better!

Sigma Test & Research Centre is the best food testing laboratory in India. We have highly professional testers as well as use up-to-date equipment for the same. Contact us at +91-9560222333 or Visit our website--

RoHS stands for Reduction of Hazardous Substances

RoHS stands for Reduction of Hazardous Substances and is an EU directive that prevents the use of certain substances in electronic products. It essentially directs to not keep certain chemicals in the product. The directive is popularly known as the “Lead Directive” among the engineers but in reality its not bound only with the lead but has rules for certain other chemicals as well. 


The list of chemicals on which this regulation works are as follows:

  • Lead (Pb)

  • Mercury (Hg)

  • Cadmium (Cd)

  • Hexavalent Chromium (Cr6+)

  • Polybrominated Biphenyls (PBB)

  • Polybrominated Diphenyl Ethers (PBDE)

  • Bis(2-Ethylhexyl)phthalate (DEHP)

  • Benzyl butyl phthalate (BBP)

  • Dibutyl phthalate (DBP)

  • Diisobutyl phthalate (DIBP)


All follow the limitation of a maximum of 0.1%


The directive has been taken to be much more than only Lead Directive as for some electronic industries the product without Lead stays to be RoHS Complaint in nature. However, not all chemicals in the list are RoHS Complaint in nature.


LDR or Light Dependent Resistor that we often use in our projects is one of those simple components that are not RoHS compliant. As we all know, the functionality of LDR to be triggering certain function on detection of light, it uses Cadmium Sulphide(CdS) in it. Cadmium Sulphide although falls in the RoHS list but is excepted due to some military or medical grounds and thus has been introduced in the commercial products.


These sets of rules greatly affect the manufacturing companies of electronic goods as these rules have direct connections to customer rights and market values. When an electronic manufacturing company starts, it first meets the need of the market and manufactures a product according to it. It then selects a small target market and maps the success and demand rate of the product. Now as it aims for the bigger market, the legislation intervenes and these rules come to be addressed to. These products are generally small electronic components that are used in other bigger electronic systems.


Thus, the main problem arrives for the companies, when the product such as LDR does not have any such immediate alternative that can be manufactured. The work becomes all the more difficult for the one designing the electronic system using the following component as they now have to design a full circuit satisfying the Ross rules to validate that particular functionality.


For example, in place of LDR, the photodiode can be used as reverse biased along with a resistor. Even after this method, the alternate circuit made in place of the product often turns out to be not as effective as the product itself. It also hampers the manufacturing process, as well as more time and work, is invested in that. 


After the Ross complaint filter is passed, the product goes through another set of filtering before getting launched in the market. This set of filtering rules is termed to be as REACH which stands for Registration Evaluation Authorization and restriction of Chemicals. REACH has a list of around 200 chemicals that it restricts from being used in the product. This rule is strictly issued on companies that transact over 1 tonne of chemicals per year for their work. This list of chemicals is termed as SVHC that is, Substance of Very High Concern.


The stage of distributors strictly follows the rule of REACH and thus even after passing the Ross restrictions, the product may get stopped by these sets of rules. These sets of chemicals are a concern that needs to look after as even if these chemicals do not seem to be harmful on the first go, but are seen to be turning toxic and harmful under recycling. Thus, the rules of REACH are the ones that need to be followed as well.


Electronic systems formed concerning the food industry strictly need to follow these rules as they are the ones that are directly connected to the health concerns of the customers and as well do not have proper medical supervision in the industry. 


Proper documentation is provided once the product or component satisfies all these requirements and thus it officially becomes usable for commercial purposes. This documentation or certification is important, as they can be asked for in any level of survey and even by the customer. The company in that case always stays liable to provide the certification under public interest.


The testing of chemicals while manufacturing the product is also an important measure that needs to be followed. Companies guiding in this matter of testing procedures are already present and one can consult them for the need.


It is better to be always dealing with the rules. Saving a few amounts of money while initializing the manufacturing house by avoiding these rules can cost the whole product after getting launched in the market. Being cheap is not always helpful for the production process in the long run.


Contact the Sigma Team For Any Inquiry


Call on this number +91-9560222333,  Mail ID-

What is Automotive Life Cycle Testing?

The life cycle is a term that defines change from one form to another that happens sequentially. Every entity goes through a life cycle from its origin to its demise. Similarly, the software is also an entity with a development life cycle called the software development life cycle (SDLC). Just as if the development of software has different specific sequential steps, testing also follows a similar pattern.

Life cycle testing or software  (SATLC) is a process of testing that consists of several specific testing procedures to be executed in a definite sequence to ensure a set quality standard of a product or software. There are many companies, which specifically provide life cycle testing services.

Every organization has its different phases of the Software automotive life cycle testing, but the basis is of every life cycle testing remains the same. Eight phases of life cycle testing are as follows:

1. Requirement phase:

The scope of the testing is analysed in this phase of life cycle testing. A group of experts sit together and study all the requirements, later they conduct brainstorm sessions to discuss whether the software requirements are testable or not. If any requirement is not testable, it is communicated to develop a more refined strategy.

2. Planning phase:

In this phase, the actual planning for testing is done after the experts are done analysing requirements. The procedures, techniques, resources, metrics that would help to meet the objectives are identified to execute an efficient testing life cycle. Planning is done keeping in mind the factors like organization test strategy and risk analysis.

3. Analysis phase:

This is a very important phase of product life cycle testing. Test conditions to be put are identified in this phase with the help of requirement document and product risk analysis. A test condition must trace back to the requirement. Different factors like levels of testing, depth of testing, product complexity, project risks, test management, SDLC, and availability of stockholders affects the identification of test conditions.

4. Design phase:

This is the “HOW” phasing of the automotive life cycle testing. This phase determines the practical execution process aspects of the testing life cycle. Processes like breaking down test conditions into easily executable multiple small sub test conditions, identification and gathering of test data, identification and setting up of test environment, creation of traceability matrices, and test coverage metrics are ensured in this phase of the testing life cycle.

5. Implementation phase:

The major process involved in this phase of the  is to ensure the creation of detailed test cases. Priority test cases that will become the part of the regression suite are also identified in this phase along with the review of test cases to ensure that test cases are correct.

6. Execution phase:

The name of this phase is self-explanatory. In this phase, the actual execution of test cases takes place. It is made sure that the entry criterion is met before the start of execution. The output of these tests determines whether the software qualifies all the test conditions. Test cases are executed and the defects raised are logged in case of any discrepancy. Traceability matrix developed bits of help in tracking the progress of the software testing life cycle.

7. Conclusion phase

Exit criteria and reporting are the focus areas of this phase of the software testing life cycle. A daily or weekly report is sent depending upon the project and stakeholders’ choice. Daily status reports and weekly status reports are depending upon the requirements of the product life cycle testing. The content of these reports focuses on the person to whom the report is sent. If the report is sent to the project manager, he is more likely to be interested in the technical aspects of the report whereas if the report is sent to stakeholders, he is more likely to be interested in the risk aspects.

8. Closure phase:

A task like completion of the test check, check that there are no open severity 1 defects, or the check that all the tests are executed and mitigated deliberately are part of this phase of the . In addition, the aspects and insight report on what was good about the Software testing life cycle and what could be improved about it are created in this phase of the testing life cycle.

Vibration Testing Lab:- Sigma Test and Research Centre


Established in 2009, Sigma Test and Research Centre delivers a comprehensive suite of accurate and thorough testing and calibration services to a varied range of industries worldwide. Technocrat educators, with 30+ years of experience in education, administration, manufacturing, and marketing, set up the lab.

They offer leading services to help their clients maintain equilibrium between quality, profitability, and sustainability. They rely on a systematic approach and expertise to manage the glitches in the market, supply chain management, and regulatory measures. 

Sigma has its headquarters in New Delhi, India. Their crucial role lies in ensuring their clients of quality control & assessment of the products. Hence, they have created amenities as per international values pleasing the necessities of ILAC, ASTM, ISO, USP, BP, and NABL

Sigma is a one-point stop for testing a comprehensive range of products used in Chemical, Biological, Mechanical, Non-Destructive, Electrical, and Electronics industries. They also provide excellent calibration services for various instruments in their laboratories. 

Sigma Test and Research Centre have a talented team of experts & knowledgeable governing bodies, state-of-the-art management, keen & multi-discipline professionals, sponsored by the most sophisticated high accuracy measuring instruments and computerized data management. 


Their mission is to provide out-of-the-box and brilliant amenities through analytical procedures and methodologies, that help organizations and industries, small or large, to attain predictably, improved, cost-effective product quality levels while sustaining the integrity in testing procedures. 


Vibration Testing impersonates the circumstances of a product or a structure that they might see during their lifetime while under a testing environment. Envisioned to certify that products are robust and perform safely during their transit, vibration testing spots performance issues and potential failures before they begin.  

It’s generally distinguished based on mechanical shock testing and its application for different periods which may vary from a few minutes to weeks. 

Furthermore, to produce a defined vibration, they use electromagnetic vibration exciters/shakers. It helps convert the electric signals into mechanical movements that are further controlled to uphold the vibration force or its level as per specified norms.


Vibration tests are done on various equipment’s, but yes, there are lots of reason behind the application of its analysis. The foremost reasons include-

  • Rather than the definite vibration level, the response to the vibration force is recorded to determine the dynamic properties of the objects. So, they try their best to find out the aptitude of those objects to transmit the vibration and its modes at resonance.

  • Moreover, at a prearranged vibration level, the vibration test is obligatory to associate the transducers to be calibrated and the reference transducer.  


The tests are carried out with exceptionally severe vibration level, ever recorded. The core purpose behind this is to determine the stimulated life of the product by performing the test for hours, days, and even weeks. 

Such severe tests include Highly Accelerated Life Tests (HALT) and Environmental Stress Screening (ESS), which helps in reporting the units that make sure the rigidity of the product to the customer, once the product lasts the test without losing its anticipated remaining life. 


FREQUENCY RANGE- For objects that incite in the shipping environment, the frequency of the test stays between 5Hz and 3kHz. It’s because of some products that are exposed to higher vibration levels during transportation.

ONE AXIS- Vibration tests are generally performed one axis at a time rather than in all the three axes. Exciters used for the test are made to shake the product within the vertical direction and to hide the complete axis; the object is rotated to apply vibration in all the directions.

FOR LARGE SAMPLES- Considering the larger samples, they are shocked horizontally instead of vertically because of some functional reasons. In this case, the slip table consists of an enormous metal plate, which helps keep the weight down, a large granite block, and endlessly pumps lubricating oil.

RESONANCE- The vibration response, which is higher than the vibration input, is known as resonance. To look for resonance and perform the tests with substantial resonance frequency, preliminary sine sweeps, or random tests takes place.

AEROSPACE ELEMENTS- Ordinarily, aerospace components face challenges like temperature, volatile weather conditions, atmospheric pressure, or heavy loads issues. Due to these issues, is why dynamic measurement application count analysis, ground vibration tests, and acoustic tests, ranging from the analysis of the products to large channels.

AUTOMOBILE INDUSTRY- The manufacturers of the automobile, industries are under the constant pressure of producing long-lasting automobiles, and vehicles with well-managed NVH (noise, vibration, and harshness) qualities. Consequently, the appliance of the vibration tests varies from acoustic, rotational, and structural testing. 

Sigma’s qualified engineers guarantee the quality of the standard of the product by tendering a varied range of vibration and shock testing. Having years of experience and knowledge, Sigma can help you determine the best designs for your products and their reliabilities. 

If you wish to know more about Sigma Laboratory or Vibration Testing, you can visit their official website- Sigmatest or you can contact them on- +91-9560222333. You can also visit Sigma’s Regd. Office at- 99, Phase 2, Badli Industrial Area, New Delhi-110042.  

How Construction Materials Testing Helps Save Costs

In the Construction industry, your business reputation gets built on the quality of your work. The better the quality, the more renowned are your structures and that's how your brand name picks fame. Besides perhaps just for the reputation, quality output builds for you, construction material testing (CMT) is a critical process that helps you as a construction company to decide and plan. In delivering reliable and superior quality construction, companies need to abide by several legal and environmental compliances, which require optimal CMT.


Testing Quality of Construction Material & their Composition

Given the relevance and importance of the quality of construction materials, constructed companies deploy CMT for almost all of their raw building materials. Right from the testing the soil quality of the construction site, CMT also evaluates the quality of steel TMT bars, Aluminium, Cement, Concrete, Bricks, Aggregates, Admixture, Flyash, Masonry, Wood, Tiles, etc. Testing of cm helps ascertain the quality and strength of the final construction intended so that there is nothing untoward that results later on. Besides, optimized CMT also helps construction companies save costs.

Cost Savings by deploying Construction Material Testing

Let us understand how construction material testing not only serves the obvious purpose of meeting compliances and regulatory requirements but also helps in saving costs.

Testing Quality of raw construction materials assures Quality of Final Product

Industry uses several raw materials for construction purposes. In the absence of quality testing of the intended raw materials, the final constructed product could be compromised in quality or could even fail stress tests. This could be a loss-making proposition for construction companies. This would result in expensive rework and repairs, which adds to your costs. When you test raw construction materials, it gives you assurance about the quality of the final construction. This reduces or eliminates chances of repairs, which otherwise can be quite costly. It is therefore recommended to routinely deploy construction material testing not only to give you superior quality constructions but at the same time save costs substantially, as compared to those who don't.

Construction Material Testing reduces the risk of hazard to human life

The most important outcome of CMT is that testing procedure of cement testing, aggregate testing, steel bars testing, etc. help in determining the post-construction strength of an intended structure. The test results derived from such CMT gives confidence and assurance to the construction companies about the quality of their final constructions, which typically aims at eliminating hazards and risk to human life. When requisite building material testing hasn't happened then there could be possibilities of the collapse of constructions made well before their estimated lifetime. This can pose to be hazardous to human life, besides causing other losses, which can result in heaving penalties to the construction company. Hence, timely CMT processes help you save on unnecessary costs.

Consistent CMT procedures help maintain optimal inventory

Construction companies that deploy consistent CMT procedures are aware of their cm quality, well in advance of commencing. In this way, they can forecast material requirements and stock their inventory adequately without having to be reactive to upcoming phases. Such optimal inventory management helps construction companies save enormously on costs. Also, the lack of repairs/rework ensures your inventory is run optimally without adding sudden and ad-hoc expenses, thereby saving you unexpected costs.

The industry is a big sector and is responsible for the several constructions, we see and live in. They must ensure quality construction so that their customers are assured of safety and quality living. To be able to give your customers quality assurance, Sigma Test and Research Centre, a NABL accredited laboratory as per ISO 17025:2005, ISO 14001:2004 offers an extensive range of building material tests, analysing the quality of building materials, testing on soils, rocks, aggregates, concrete, bricks-blocks, steel, and polymers. Connect with our team of cm technicians and engineers, who will advise you and create customized constructed material testing programs for your company.

Contact Sigma Test and Research Centre 

 Contact us at +91 - 9560222333

 Visit Our Website

How to Reduce Segregation in Concrete?

In this article, we will be discussing segregation, factors causing it, and different methods to avoid it. So, now the question arises what is segregation?


The segregation of concrete is the failure of newly mixed concrete. Segregation is a term when the particles which are present in concrete, cement, sand, and their aggregates get separated from each other during handling and placement. It is usually caused by excessive vibration of cement


In concrete technology, segregation is of three types:-

  1. Separation of Coarse aggregate from the concrete mixture,
  2. Separation of Cement paste from the concrete during the plastic stage
  3. Separation of water from the concrete mix (Which is also called as Bleeding in concrete)

Some other factors causing segregation in concrete are:

  1. Transporting concrete mixtures for long distances.
  2. The poorly proportioned mixture, where the adequate matrix is not there to tie up the aggregates.
  3. Dropping concrete from more than 1m high can cause segregation.
  4. Vibrating the concrete for a long time can cause segregation.

To reduce segregation in concrete the workers need to follow these measures :

  1. The concrete water-cement ratio must be in the limit.
  2. The freshly prepared concrete mixture should not be too wet nor too dry.
  3. Do not place the concrete to its desired area from an elevated height.
  4. Concrete transportation should be done properly. 
  5. Select the shortest route for the transportation of the concrete mix.
  6. The vibrator should be used in concrete for the proper time, neither too long nor too short span of time.
  7. The formwork must not be loose.
  8. Do not vibrate the formwork.
  9. Do not allow concrete to flow.

Contact the Sigma Team For Any Inquiry


Call on this number +91-9560222333,  

Mail ID-

View older posts »



There are currently no blog comments.