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BIS Certification for Hot-Dip Zinc Coating on Structural Steel and Allied Products IS 4759:1996

ISI Mark Certification Product Image

BIS Certification for hot dip galvanized coatings on structural steel and other allied products is essential in ensuring the strength, safety and durability of the steel materials used in construction. The process helps to ensure that the steel does not undergo rusting or corrosion through the application of the zinc coating layer. According to IS 4759:1996, the manufacturing companies have to adhere strictly to quality specifications like coating thickness, adhesion, uniformity and corrosion resistance to guarantee proper performance in actual conditions.

The BIS license is important as structural steel is used in the construction of bridges, buildings and towers that require high levels of safety. The BIS certification ensures that the product is up to the Indian standard requirements and passes all the necessary tests. It also gives the ISI mark to the product, which builds credibility in the Indian market.

What is IS 4759:1996 Standard?

IS 4759:1996 is the Indian standard that outlines the specifications for hot-dip zinc coating on structural steel and similar items. It makes sure that the steel items are adequately coated with zinc to avoid corrosion and damage due to the environment. The following are some of the criteria for checking the coated steel products under BIS regulations -

  • Proper zinc coating thickness
  • Strong bonding between the steel and the zinc layer
  • Uniform and smooth surface finish
  • Resistance to corrosion in harsh environments
  • Overall durability and protection performance

Who can apply for BIS Certification as per IS 4759:1996?

BIS certification under IS 4759:1996 is required for businesses involved in coating, manufacturing, importing, or supplying hot-dip galvanized steel products in India. This ensures that only safe and tested products are used in important structures. Applicable to -

  • Manufacturers (India) - Must obtain BIS certification before selling coated steel products under regulated use.
  • Foreign Manufacturers - Must get BIS approval before exporting galvanized steel products to India.
  • Importers - Must ensure products are BIS certified before selling them in the Indian market.

Importance of ISI Mark Certification for Zinc Coated Structural Steel

BIS ISI mark certification of hot-dip zinc-coated steel guarantees that the product conforms to safety and quality standards set by BIS as per IS 4759:1996. This helps improve the performance and durability of steel in construction and other industrial uses.

  • This will ensure conformity with BIS safety norms for corrosion resistance
  • Improve the life span of structural steel in adverse weather conditions
  • Guarantee high bond strength between the zinc coating and steel
  • Increase reliability in bridges, buildings and infrastructure projects
  • Lower maintenance cost of steel structures
  • Prevent premature rusting and deterioration of the structure
  • Increase acceptance in governmental and private projects
  • Ensure consistent quality of coating in mass production
  • Gain customer confidence through ISI marking
  • Help in standardization in the steel protection industry

BIS Testing Requirements for Hot-Dip Zinc Coatings on Structural Steel & Allied Products

In order to ensure the safety and longevity of the performance of hot-dip zinc coatings on structural steel and other allied products, the Bureau of Indian Standards has set the minimum standards in IS 4759:1996. It is a means of ensuring that manufacturers keep up the same quality standards as per the IS code. The hot-dipped steel would serve as an effective anti-corrosion coating as well as provide stable performance in any climatic condition. Below are the BIS testing parameters for hot-dip zinc coatings on structural steel -

Test GroupWhat is TestedPurpose
Quality of Zinc Zinc ingot grade as per IS 209:1992 or IS 13229:1991 Ensures proper raw material quality for galvanizing process
Coating Mass Test Average mass and thickness of zinc coating Ensures sufficient protective zinc layer on steel surface
Freedom from Defects Surface defects like cracks, lumps, or uneven coating Ensures smooth and defect-free coating finish
Uniformity Test Evenness of zinc coating using copper sulphate test Ensures uniform protection across the entire surface
Adhesion Test Bond strength of zinc coating on steel surface Ensures coating does not peel or flake during handling or use
Inspection & Visual Test Vision-based or manual inspection Ensures overall appearance and surface quality compliance
Batch/Control Unit Test Testing per 50 tonnes or defined production batch Ensures consistent quality across production lots
Rejection CheckIdentification of non-conforming material Ensures defective products are properly segregated and disposed

BIS Certification Process for IS 4759:1996

The BIS testing procedure guarantees that the hot-dipped zinc coatings used for structural steel and related products, as defined in the IS 4759:1996 standard, conform to quality and performance requirements for safe usage. The certification procedures have been established by the Bureau of Indian Standards (BIS) and include the following -

  1. Online Registration - Manufacturers register on the BIS Manak portal by submitting company, factory and product details. Foreign manufacturers must appoint an Authorized Indian Representative (AIR).
  2. Testing at BIS-Approved Laboratory - Product samples are tested in BIS-approved laboratories to check coating thickness, adhesion and corrosion resistance.
  3. Application Submission - The application is submitted along with test reports, technical documents and factory details. Foreign manufacturers must also submit AIR-related documents.
  4. Factory Inspection - Officials from the BIS examine the factory to check the production process and the quality control system.
  5. Grant of BIS License - If all requirements are met, BIS issues the certification license for IS 4759:1996 compliance.
  6. Use of ISI Mark - After the approval, the producer may put the ISI mark on the goods with a CM/L number.


Required Documents for BIS IS 4759:1996 Approval

Document Category Documents Required
Basic Details GST Certificate, Email ID & Contact Number, Factory & Office Address, Rent Agreement / Lease Deed (if applicable), Partnership Deed (if applicable for partnership firms)
Manufacturing Details List of Machinery, Process Flow Chart, Factory Layout Plan
Raw Material Details List of Raw Materials, Supplier Details, Raw Material Invoices, Raw Material Test Certificates
Testing & Quality Control List of Testing Equipment, Calibration Certificates, QC/Lab In-charge Appointment Letter & Qualification
Production Details Annual Installed Capacity, Last Year Production Value
Product & Packaging Details Quantity per Package, Nature of Packing, Product Printing / Marking Details
Management DetailsTop Management Details, BIS Communication Contact Person
Brand & Certification Documents Trademark / Brand Certificate, Consent Letter from BIS Recognized Laboratory
Additional Documents Weekly Off Details, Hygiene Document (if applicable), Relaxation Letter (if applicable), Any Other Relevant Document
Foreign Manufacturer Requirements Agreement with AIR (Authorized Indian Representative), Aadhaar Card of AIR, AIR Nomination Form, Required Undertakings, Scope of License

Foreign manufacturers should appoint an Authorized Indian Representative (AIR) in India. This person serves as the local contact for the Bureau of Indian Standards (BIS) and looks after all regulations in India.

ISI Marking and Identification Rules for Hot-Dip Zinc Coatings on Structural Steel & Allied Products

On acquiring the BIS Certification, the ISI Mark for Hot Dip Zinc Coating for Structural Steel and its Allied Products needs to be permanently affixed to the product or surface or on its packaging, as the case may be. In addition to the ISI Mark, some other crucial information including the identification and license number of the manufacturer (CM/L) is needed. The ISI Mark signifies that the product has fulfilled all the necessary quality and safety requirements as per BIS IS 4759:1996. Below are more details about the same -

RequirementDetails
ISI Mark Indicates that the product is BIS certified and conforms to standards
Standard Number IS 4759:1996
CML Number Certification Marks Licence (CML) number issued by BIS
Manufacturer DetailsName of manufacturer or registered trademark
Batch / Date Batch number, heat number, or manufacturing date for traceability

Note - Marking is typically applied using durable stamping, tagging, or permanent printing to ensure clear identification during handling, storage and transportation, as per BIS marking requirements.

Validity of BIS License under IS 4759:1996

ParticularsDetails
ValidityTypically 1 to 5 years, depending on BIS approval conditions
Renewal Must be renewed before expiry by submitting the application along with the prescribed fee and updated documents
SurveillanceIncludes periodic factory inspections and market sample testing conducted by BIS
ComplianceContinuous following to standard and applicable Quality Control Orders (QCOs) is mandatory
Risk Non-compliance or failed sample testing may lead to suspension or cancellation of the BIS license

Cost of BIS Certification for Zinc Coatings on Structural Steel & Allied Products

The BIS Certification cost of Hot-Dipped Zinc Coating on Structural Steel and other allied items will include the cost of Application Fee, Inspection, Licensing, Testing and Marking. All such fees have to be paid to BIS as per Scheme I under IS 4759:1996. The amount of cost will vary based on the type of manufacturing company and its test requirements.

Charge TypeIndian ManufacturersForeign Manufacturers
Application Fee INR 1,000 USD 15
Audit Charges INR 7,000 USD 3,200 - 5,900
License Fee INR 1,000 USD 15
Marking Fee As applicable As applicable
Testing Charges As applicable As applicable
EVTL India Consultancy Fee As per actual As per actual

Note -

  • Application fee for foreign manufacturers is payable via SWIFT (SAARC countries may pay in INR with applicable GST).
  • Audit charges for foreign manufacturers vary based on country/location.
  • The marking fee is determined based on the product category and production volume (MSME benefits may apply).
  • Testing charges are paid directly to BIS-recognised laboratories.
  • Consultancy fees vary depending on product type and factory location.

Problems faced during BIS IS 4759:1996 Certification

Manufacturers can face various problems when trying to get BIS certification for the hot-dip zinc-coated steel products. These problems should be handled very carefully to avoid any delays.

  • Incorrect thickness of the coating
  • Poor adhesion between zinc and the steel surface
  • Low quality of the raw materials used
  • Failure of the corrosion test
  • Uneven coating during the manufacturing process
  • Incorrect documents submission
  • Problems related to factory inspection non-compliance
  • Test failure in BIS-approved labs
  • Consistent quality problem among different batches
  • Environmental test failure with humidity and heat

Conclusion

Hot-dip zinc coatings for structural steel and allied products are very important in providing protection against rusting and corrosion for steel products. The hot-dip zinc coating is extensively used in bridges, buildings, towers and other infrastructural applications for providing durable strength. Adherence to IS 4759:1996 ensures that the manufacturers adhere to high standards of quality concerning coating thickness, adhesion, uniformity and corrosion resistance of the coating.

The BIS certification for the hot-dip zinc coating ensures that the product complies with all Indian standard specifications and enables manufacturers to apply the ISI mark on their product. This provides additional credibility, reliability and safety of the product for use in infrastructure projects. It also builds confidence in the customer and facilitates procurement of contracts from the government and industries. Manufacturers can seek advice from a reliable BIS consultant for hassle-free certification of their product according to IS 4759:1996. EVTL India will facilitate your BIS certification process easily and quickly.

BIS Certification for Hot-Dip Zinc Coating on Structural Steel and Allied Products IS 4759:1996