What is the minimum required pencil hardness for a glossy powder coating?

A minimum hardness of 'H' is required for glossy and semi-glossy finishes. (Table 2)

What adhesion rating is required?

The coating must achieve Class 0 in the cross-cut adhesion test as per IS 101 (Part 5/Sec 2). (Table 2)

What is the difference between Type 1 and Type 2 coatings?

Type 1 is for interior use and Type 2 is for exterior use. Type 2 has higher durability requirements, such as a longer minimum salt spray resistance (480h vs 240h). (Clause 3.1 & Table 2)

How is coating flexibility tested?

Using a 6 mm cylindrical mandrel bend test. The film should show no signs of cracking or detachment when bent around the mandrel. (Table 2)

IS 9862

: 2008

Powder Coatings for General Purposes - Specification

CurrentFrequently UsedSpecificationMaterials Science · Painting, Coatings and Surface Finishing

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This standard specifies the requirements and testing methods for thermosetting powder coatings intended for general industrial purposes. It covers two types of coatings (for interior and exterior use), detailing their powder properties, film characteristics like hardness and adhesion, and resistance to environmental factors. It serves as a quality benchmark for manufacturers and users of general-purpose powder coatings.

Specifies requirements and methods of test for powder coatings suitable for general purposes on various substrates.

Quick Reference Values

Minimum Pencil Hardness (Glossy/Semi-Glossy)H

Minimum Pencil Hardness (Matt)HB

Minimum Adhesion (Cross-Cut Test)Class 0

Flexibility (Mandrel Bend Test Diameter)6 mm

Minimum Recommended Film Thickness50 microns

Salt Spray Resistance (Type 1 - Interior)240 hours minimum

Salt Spray Resistance (Type 2 - Exterior)480 hours minimum

Practical Notes

This is a general-purpose standard. For more specific resin chemistries, refer to the IS 13871 series (Part 1: Epoxy, Part 2: Epoxy-Polyester, Part 3: Polyester).

Proper surface preparation (pre-treatment) of the substrate is critical to achieve the performance specified in this standard, although pre-treatment itself is outside the scope of this document.

The performance of the coating heavily depends on the curing schedule (time and temperature), which must be strictly as per the manufacturer's recommendation.