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- Non-magnetic stainless steel used in electrical equipment is certified by BIS to be of controlled magnetic permeability.
- IS 10632 (Part 2):1983 specifies the chemical, mechanical, and dimensional standards for the binding wire used in the electrical field.
- Using the certified binding wire is the source of prevention of the insulation getting damaged, the winding failing, and the flux distorting.
- To get BIS approval, manufacturers should be able to present traceability, lab reports, and evidence of the controlled annealing process.
- OEMs are willing to pay for BIS-compliant wire as it makes their products more reliable, less rework is required, and export acceptance is facilitated.
Introduction
Just a few months back, the motor manufacturer in Pune had an overseas audit, which led to an unexpected rejection of their stator assembly. The problem was not the design or the workmanship, but the stainless steel wire that came from a non-certified vendor. As electrification continues to evolve and the devices become more sensitive to magnetic variations, such cases are becoming more frequent. Non-magnetic stainless steel cannot be replaced with normal grades, and even small deviations can change the flux paths, cause the device to become less efficient, and affect its reliability over time. Bureau of Indian Standards
What is IS 10632 (Part 2):1983?
IS 10632 (Part 2):1983 is an Indian Standard that prescribes the requirements for a stainless steel wire binding electrically non-magnetic (EM-NMSW) which is the one used in electrical applications. The standard specifies that the wire should be of low magnetic permeability, should have uniform mechanical properties and should be dimensionally accurate, which are the characteristics necessary for electrically stable performance in transformers, motors, and other electrical devices.
Key Points:
- Makes the definition of chemical composition limits that are necessary for the retention of austenitic, non-magnetic structure.
- Indicates that the magnetic permeability should be limited even after cold working or forming.
- Specifies the mechanical properties of the material, such as tensile strength, elongation, and hardness. ISI MARK
- Defines the dimensional tolerances for diameter and uniformity that are necessary for proper winding and clamping.
- Provides for a surface finish that is both smooth so that insulation is not damaged and corrosion is prevented.
Why is BIS Certification Mandatory
The reason behind the mandatory requirement of the BIS Certification for non-magnetic stainless steel used in the area of electrical application is that it helps in maintaining the uniform quality, safety, and reliability of the products. Components in the electrical area such as transformers, motors, and precision instruments depend on binding wire that keeps low magnetic permeability and stable mechanical properties. In case of absence of certification, the manufacturers are exposed to risks:
Key Points:
- Using substandard wire that becomes partially magnetic after processing.
- Equipment failures due to uneven flux, insulation damage, or winding stress.
- Rejection in domestic or international audits and tenders.
- Increased warranty claims and maintenance costs.
- Legal and compliance issues, as BIS certification is recognized by Indian regulations and many procurement standards.
Importance and Benefits of BIS Certification
| Importance | Benefits |
| Ensures wire meets IS 10632 (Part 2):1983 standards | Reliable electrical performance and low magnetic permeability |
| Confirms chemical and mechanical consistency | Reduces risk of winding failures and insulation damage |
| Guarantees traceability and quality control | Builds trust with OEMs and clients |
| Compliance with Indian regulations | Eligibility for government and export contracts |
| Prevents substandard materials in production | Lowers rework, warranty claims, and maintenance costs |
Step-by-Step Process of BIS Certification
Step1:Documentation
- Collect required technical documents
- Prepare product specifications
- Gather company registration details
- Ensure documents follow BIS format
Step2:Product Testing
- Send samples to a BIS-approved lab
- Conduct safety and quality tests
- Receive test reports
- Confirm compliance with BIS standards
Step3:Application Submission
- Fill out the BIS application form
- Upload all required documents
- Attach valid test reports
- Pay the necessary BIS fees
Step4:Scrutiny and Inspection
- BIS reviews submitted documents
- Authority verifies test results
- Factory/product inspection may occur
- Clarifications requested if needed
Step5:Grant of License
- BIS approves the application
- License number is issued
- Product can carry BIS mark
- Renewal required before expiry
Documents Required for BIS Certification
| Category | Documents Required |
| Business Documents | Business license/registration, ISO certificate, organizational details |
| Manufacturer Details | Factory layout, process flow chart, machinery list, production details |
| Product Documents | Product specifications, component list, user manual, model details |
| Testing Documents | Test report from BIS-recognized lab, sample details, test request form |
| Legal & Compliance | Authorization letter, brand ownership proof, trademark certificate (if any) |
| Import/Foreign Manufacturer (If applicable) | AIR (Authorized Indian Representative) details, contract agreement, overseas manufacturer documents |
Timelines, Costs, Validity & Renewal
- Timelines: Usually from 20 to 30 days, with only 7-15 days for the testing.
- Costs: The cost of the government and the test varies depending on the product. There can be some additional charges though.
- Validity: The validity period is 2 years in most situations.
- Renewal: The renewal is done before the expiration; there should be updated documents/tests; the renewal
Why Choose Diligence Certifications
- Expert team with strong BIS and regulatory knowledge
- Fast, streamlined processing to reduce approval delays
- Accurate documentation and testing coordination
- Transparent guidance with clear communication
- High success rate and complete end-to-end support
Conclusion
Certification by the Bureau of Indian Standards (BIS) of the Specification for Non-Magnetic Stainless Steel for Electrical Applications, mainly for IS 10632 (Part 2):1983, is more than just a legal requirement – it is a key quality measure. It is the means through which the binding wire is ensured to have magnetically low permeability, uniform mechanical strength, and dimensional accuracy, which are the characteristics necessary for the stable operation of transformers, motors, and precision instruments. Makers of BIS-certified wire have the opportunity to lower the rate of their work again, enhance the reliability of their products, and secure the trust of clients and OEMs.
Frequently Ask Questions
What is BIS Certification for non-magnetic stainless steel?
BIS Certification is an indication that the stainless steel to be used in the electrification is of the utmost low magnetic permeability, good mechanical properties and the correct dimensions, as required by the standard.
What is IS 10632 (Part 2):1983 about?
The standard lays down the specifications that the binding wire used in the manufacture of electrical equipment has to conform to e.g. the elemental composition, mechanical strength, magnetic permeability, dimensions, and surface finish.
Why is BIS Certification compulsory for electrical-grade stainless steel?
An electrical-grade stainless steel with such a certificate will have a consistent quality level, will not cause situations of equipment failure, will comply with regulations and will get acceptance from OEMs and foreign markets.
What kind of industries use BIS-certified non-magnetic stainless steel?
Certified transformers, motors, precision instruments, high-frequency coils, aerospace components, and power electronics manufactures are essential suppliers of the wire industry.
What are the key properties tested under IS 10632 (Part 2):1983?
The main properties identified that are subject to testing include magnetic permeability, tensile strength, elongation, hardness, dimensional tolerances, and surface finish.
How do manufacturers get BIS Certification?
The process involves technical documentation suburbs, product samples testing, an application form, and then verification and factory inspection.
How much time does BIS Certification require?
About 20–30 days in general, with a testing time of 7–15 days in most cases.
What are the required documents for BIS approval?
Besides business registration, factory layout, and product specifications, the other documents needed are test reports from a lab recognized by BIS, letter of authorization, and if applicable, trademark or brand ownership proof.
How long does BIS Certification last?
BIS Certification is valid for a period of 2 years and requires a renewal with new documents and test reports before expiration.
What are the advantages of using BIS certified binding wire?
Binding wire of a kind that is certified will conform to these benefits, such as reliable electrical performance, reduced risk of insulation damage, cessation of windings, client loyalty support, government tender access, and smooth facilitation of foreign trade.
