What is the standard zinc coating mass for these sheets?

The standard refers to IS 277 for coating classes. A common class is Z120, which means a minimum of 120 g/m² total on both surfaces.

What does the T-bend test indicate?

It measures the flexibility and adhesion of the paint film when the sheet is bent. A lower 'T' value (e.g., 2T) indicates better flexibility and less risk of cracking than a higher value (e.g., 4T).

What is the pencil hardness test for?

It assesses the scratch resistance and hardness of the cured paint film. The standard requires a minimum hardness of 'H' (Clause 7.2).

Does this standard specify the color of the sheet?

No, the color is as agreed upon between the purchaser and the manufacturer (Clause 5.1). The standard focuses on the performance and durability of the paint, not its specific color.

IS 14245

: 1995

Prepainted hot-dip metallic coated steel sheets/coils for roofing and cladding

SupersededFrequently UsedSpecificationBIMMaterials Science · Roofing Materials

Superseded by IS 15965:2012

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This standard specifies the requirements for prepainted steel sheets and coils that have a hot-dip metallic coating, such as zinc or aluminium-zinc alloy. It covers the base metal, paint system, dimensions, tolerances, and performance criteria for materials intended for roofing, cladding, and similar applications.

Specifies requirements for pre-painted hot-dip metallic coated steel sheets/coils for roofing and cladding.

Quick Reference Values

Minimum zinc coating mass (Class Z120)120 g/m²

Standard top paint coat thickness18-22 microns

Standard primer thickness5-7 microns

T-Bend test requirement (General purpose)≤ 4T

Pencil hardness requirementH minimum

Salt spray test duration requirement1000 hours

Practical Notes

Always specify and verify the Total Coated Thickness (TCT), not just the Base Metal Thickness (BMT), as TCT includes the metallic and paint coatings which contribute to durability.

The type of paint system (e.g., RMP, SMP, PVDF) significantly impacts durability, UV resistance, and cost; select based on the project's environmental exposure and required lifespan.

Request the Manufacturer's Test Certificate (MTC) to confirm compliance with all performance tests, especially salt spray and UV resistance for coastal or sunny locations.