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IS 13213:1991 is the Indian Standard (BIS) for thermosetting powder coatings - specification. 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.
Overview
Status
Current
Usage level
Frequently Used
Domain
Materials Science — Painting, Coatings and Surface Finishing
! 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.
BS EN 12206-1:2021BSI (British Standards Institution) / CEN (European Committee for Standardization), UK/Europe
HighCurrent
Paints and varnishes — Coatings on aluminium and aluminium alloys for architectural purposes — Part 1: Coatings prepared from coating powder
Covers performance requirements for a key application of thermosetting powder coatings (architectural aluminium).
ISO 8130 SeriesISO (International Organization for Standardization), International
MediumCurrent
Coating powders (Various parts, e.g., Part 2: Determination of density by gas comparison pyknometer)
Provides the individual test methods that are referenced by comprehensive specification standards.
ASTM D3451-22ASTM International, USA
MediumCurrent
Standard Guide for Testing Coating Powders and Powder Coatings
A guide outlining the test procedures for powder coatings, analogous to the testing section of IS 13213.
BS 6496:1984BSI (British Standards Institution), UK
HighWithdrawn
Specification for powder organic coatings for application and stoving to aluminium alloy extrusions, sheet and preformed sections for external architectural purposes...
A historically significant specification for architectural powder coatings, conceptually similar to IS 13213 for its specific application.
Key Differences
≠IS 13213 is a single, self-contained specification document. Modern standards like BS EN 12206-1 are modular, referencing dozens of separate ISO standards for each specific test method.
≠IS 13213 classifies powders by general resin chemistry (Epoxy, Polyester, Hybrid). International standards are predominantly performance-based, defining classes of durability (e.g., 'Class 1', 'Class 2') based on weathering tests, irrespective of the exact chemistry.
≠Weathering and durability requirements in IS 13213 are basic (e.g., 1000 hours salt spray). Modern standards like BS EN 12206-1 mandate extensive accelerated weathering (QUV/Xenon-Arc) and natural weathering (e.g., Florida exposure) with strict gloss retention and color change criteria.
≠Acceptance criteria in IS 13213 are often qualitative ('shall pass', 'no detachment'). International standards use quantitative and more stringent criteria (e.g., 'adhesion classification 0', 'indentation value ≥ 80', 'creep from scribe < 2.0 mm').
Key Similarities
≈Both IS 13213 and international standards specify a core set of mechanical tests for the cured film, including adhesion (cross-cut), flexibility (mandrel bend), impact resistance, and hardness.
≈The requirement to test and define properties of the unapplied powder, such as particle size distribution and gel time (reactivity), is common to ensure proper application and curing.
≈The use of salt spray testing as a fundamental method for assessing corrosion resistance on a scribed panel is a common feature in both the Indian and international standards.
≈All standards acknowledge the critical importance of the manufacturer's specified curing schedule (time and temperature) and mandate that all test panels be prepared and cured according to these instructions.
Parameter Comparison
Parameter
IS Value
International
Source
Adhesion (Cross-Cut Test)
Shall show no signs of detachment [Effectively Class 0 or 1 on ISO 2409 scale]
Classification 0 according to ISO 2409.
BS EN 12206-1
Impact Resistance
Pass a 150 cm-kg test with no cracking or detachment.
No cracking or detachment when subjected to a 2.5 Nm impact (approx. 25.5 kg-cm) as per ISO 6272-1.
BS EN 12206-1
Hardness (Indentation)
Passes test as per IS 101 (Part 3/Sec 2).
Indentation length shall result in a Buchholz hardness value of ≥ 80, tested per ISO 2815.
BS EN 12206-1
Gloss Tolerance (@60°)
Typically ±5 gloss units or as agreed.
Specified tolerances by range: ±7 for >70 units, ±5 for 10-70 units, ±3 for <10 units.
BS EN 12206-1
Salt Spray Test (Duration)
Up to 1000 hours (for exterior durable grade).
1000 hours (Acetic Acid Salt Spray - AASS test per ISO 9227).
BS EN 12206-1
Salt Spray Test (Acceptance Criteria)
Qualitative: No blistering, peeling, or corrosion.
Quantitative: Max average creep from scribe < 2.0 mm; Blistering not to exceed size 2, density 2 of ISO 4628-2.
BS EN 12206-1
Minimum Dry Film Thickness (DFT)
As specified, typically 50-80 µm.
Minimum local thickness of 60 µm for standard durability powders.
BS EN 12206-1
⚠ Verify details from original standards before use
Key Values6
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