What is the standard test for coating adhesion?

The Cross-cut test as per Clause 6.4 is the primary method. The coating should show no signs of detachment.

What film thickness should be used for testing?

Tests are typically conducted on a dry film thickness of 50 ± 10 microns, unless otherwise specified (Clause 6.1.1).

Is this coating suitable for outdoor use?

No. Standard epoxy coatings have poor UV resistance and tend to chalk and fade outdoors. Polyester or hybrid powder coatings are specified for exterior applications.

What is the minimum hardness requirement?

The coating must have a minimum pencil hardness of 'H' when tested according to the standard (Table 1).

IS 13608

: 1993

Epoxy Powder Coatings - Specification

CurrentSpecializedSpecificationMaterials Science · Painting, Coatings and Surface Finishing

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This standard specifies the requirements, sampling methods, and tests for thermosetting epoxy-based powder coatings. It is intended for materials used for protective and decorative purposes on various substrates, detailing properties like film thickness, gloss, adhesion, and resistance to impact.

Specifies requirements and methods of test for epoxy powder coatings for protective and decorative purposes.

Quick Reference Values

Test panel dry film thickness50 ± 10 microns

Pencil HardnessMinimum H

Adhesion (Cross-cut test)No detachment of film

Flexibility (10 mm Mandrel)No cracking or detachment

Impact Resistance (Direct)Minimum 100 kg.cm

Gloss at 60° angle (For Glossy finish)Minimum 80 units

Practical Notes

This 1993 version has been superseded by IS 13608:2020; the newer version should be used for all current work and procurement.

Proper surface preparation of the substrate (e.g., degreasing, phosphating) is critical for achieving the specified adhesion and overall performance.

Adherence to the manufacturer's recommended curing schedule (time and temperature) is essential for the coating to develop its intended chemical and mechanical properties.