The Bureau of Indian Standards has adopted this Indian Standard (Fifth Revision), mirroring the ISO 11949:2016 standard titled "Cold-reduced tin mill products - Electrolytic tinplate," issued by the International Organization for Standardization (ISO). This adoption follows the recommendation of the Wrought Steel Products Sectional Committee and has received approval from the Metallurgical Engineering Division Council.

Initially published in 1962, this standard has undergone four revisions: in 1974, 1982, 1993, and 2006. The fourth revision of this standard matched ISO 11949:1995. Its fifth revision aims to synchronize with the latest version of ISO 11949:2016.

This Standard specifies the criteria for single and double cold-reduced low-carbon mild steel electrolytic tinplate, available in sheets or coils for further sheet cutting.

Single-reduced tinplate is defined with nominal thicknesses in increments of 0.005 mm, ranging from 0.17 mm to 0.49 mm. Double-reduced tinplate is offered with nominal thicknesses in multiples of 0.005 mm, spanning from 0.14 mm to 0.29 mm. This International Standard pertains to coils and sheets cut from coils with minimum nominal widths of 500 mm.

Single-reduced tinplate is categorized by a temper classification determined by Rockwell HR30Tm hardness values outlined in the standard for this International Standard. Tin coating purity must adhere to the standard specifications. Tinplate manufacturing methods are at the discretion of the manufacturer and are not detailed in this International Standard.

Single cold-reduced tinplate is available in bright, silver, stone, or matt finishes, while double cold-reduced tinplate is commonly provided with a stone surface finish and a flow-brightened tin coating. Testing one sample of any thickness is sufficient to cover all designations within the group of products.

TESTS

The subsequent test must be conducted for Cold Reduced Electrolytic Tinplate.

• Tolerances on dimensions and shape

• Tin coating mass

• Hardness measurement

• Tensile test

MARKING

Marking must comply with IS 1993:2018 standards. Material should be labeled with information as outlined in the standard, and optionally, the material may bear the Standard Mark (ISI Mark). To use the Standard Mark (ISI Mark), the Manufacturer needs to obtain a BIS license from the Bureau of Indian Standards. This license is granted following a successful assessment of manufacturing infrastructure, production processes, and quality control and testing capabilities conducted during a visit to its manufacturing premises.

PROCESS FOR BIS ISI MARK CERTIFICATION