What is the minimum storage life for the powder?

The powder must be stable for a minimum of 6 months when stored in original sealed containers below 30°C (Clause 4.2.1).

How is adhesion tested and what is the pass criteria?

Adhesion is tested using the cross-cut test as per Annex B. The film must achieve a classification of Gt 0, indicating no detachment of squares.

Does this standard specify the exact color of the coating?

No, the color and degree of finish (e.g., smooth, textured, matt) shall be as agreed upon between the purchaser and the supplier (Clause 4.3.1).

What is the requirement for flexibility?

The cured film, when tested on a conical mandrel bend tester as per Annex C, shall show no signs of cracking or detachment from the substrate.

IS 13213

: 1991

Thermosetting Powder Coatings - Specification

CurrentFrequently UsedSpecificationMaterials Science · Painting, Coatings and Surface Finishing

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This standard specifies the requirements, sampling methods, and testing procedures for general purpose thermosetting powder coatings. It covers properties of the powder before application (e.g., storage stability, gel time) and the performance characteristics of the cured film, such as gloss, adhesion, flexibility, and impact resistance.

Specifies requirements and methods of test for thermosetting powder coatings intended for protective and decorative finishes.

Quick Reference Values

Minimum storage stability period6 months

Gel time tolerance from nominal value±15 percent

Minimum Pencil HardnessH

Mandrel Bend Test (Flexibility)No cracking or detachment

Minimum Impact Resistance (falling weight)100 kg.cm

Cross-Cut Adhesion Test Minimum RatingGt 0

Practical Notes

Proper surface preparation (e.g., degreasing, phosphating per IS 6005) is absolutely critical for the coating to meet the performance requirements of this standard, especially adhesion.

The type of powder (Epoxy, Polyester, Hybrid, etc.) must be selected based on the end-use environment, particularly for UV exposure and outdoor durability, which is not detailed in this general purpose specification.

The curing schedule (temperature and time) provided by the manufacturer must be strictly followed, as under-curing or over-curing will lead to failure in key film properties like flexibility, hardness, and chemical resistance.