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IS 13608 : 1993Epoxy Powder Coatings - Specification

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BS EN 12206-1 · ASTM D3451-06(2017) · AAMA 2603
CurrentSpecializedSpecificationMaterials Science · Painting, Coatings and Surface Finishing
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OverviewValues6InternationalTablesFAQ4Related

IS 13608:1993 is the Indian Standard (BIS) for epoxy powder coatings - specification. 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.

Overview

Status
Current
Usage level
Specialized
Domain
Materials Science — Painting, Coatings and Surface Finishing
Type
Specification
International equivalents
BS EN 12206-1:2021 · BSI (British Standards Institution) / CEN (European Committee for Standardization), UK/EuropeASTM D3451-06(2017) · ASTM International, USAAAMA 2603-22 · FGIA (Fenestration and Glazing Industry Alliance), USA
Typically used with
IS 101IS 2379IS 513IS 1070
Also on InfraLens for IS 13608
6Key values1Tables4FAQs
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 This 1993 version has been superseded by IS 13608:2020; the newer version should be used for all current work and procurement.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.
Frequently referenced clauses
Cl. 5RequirementsCl. 6Methods of TestCl. 6.4AdhesionCl. 6.5Flexibility and Adhesion (Bend Test)Cl. 6.7Resistance to ImpactAnnex A - Sampling of Epoxy Powder Coatings
Pulled from IS 13608:1993. Browse the full clause & table index below in Tables & Referenced Sections.
epoxypowder coatingthermosetting resinpaintsprotective coatings

International Equivalents

Similar International Standards
BS EN 12206-1:2021BSI (British Standards Institution) / CEN (European Committee for Standardization), UK/Europe
HighCurrent
Paints and varnishes — Coating of aluminium and aluminium alloys for architectural purposes — Part 1: Coatings prepared from powder coating materials
Specifies performance for thermosetting powder coatings on architectural aluminium, overlapping significantly on core performance tests.
ASTM D3451-06(2017)ASTM International, USA
MediumCurrent
Standard Guide for Testing Coating Powders and Powder Coatings
Provides a comprehensive guide to test methods for powder coatings, many of which are referenced or similar to those in IS 13608.
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...
Historically, this was the primary UK specification for architectural powder coatings, with a very similar intent and test profile to IS 13608.
AAMA 2603-22FGIA (Fenestration and Glazing Industry Alliance), USA
MediumCurrent
Voluntary Specification, Performance Requirements and Test Procedures for Pigmented Organic Coatings on Aluminum Extrusions and Panels
Defines performance level for standard architectural coatings, but focuses on the finished product performance rather than the powder material itself.
Key Differences
≠IS 13608 is a general specification for pure epoxy powders, which inherently have poor UV resistance and are intended for interior/non-exposed use. Modern international standards like BS EN 12206-1 focus on exterior-durable polyester or polyurethane systems and include stringent weathering tests (e.g., Xenon arc, natural Florida exposure) not required by the IS code.
≠The IS code from 1993 has less stringent environmental and health safety requirements. Modern European standards (e.g., BS EN 12206-1) are aligned with REACH regulations, imposing strict limits on heavy metals like lead, chromium (VI), and cadmium, which are not as explicitly controlled in the older IS standard.
≠IS 13608 specifies fixed curing schedules for test panels (e.g., 200°C for 10 minutes). International standards are more flexible, typically requiring tests to be conducted according to the manufacturer's specified curing parameters, accommodating a wider range of chemistries including low-temperature cure powders.
≠Corrosion testing methods have evolved. IS 13608 specifies a standard neutral salt spray (NSS) test. BS EN 12206-1 mandates a more aggressive acetic acid salt spray (AASS) test and may refer to cyclic corrosion tests in related standards, which are considered more representative of real-world conditions.
Key Similarities
≈All standards mandate fundamental mechanical performance tests to ensure coating integrity, including adhesion (via cross-cut/cross-hatch), impact resistance (falling weight), and hardness (pencil or indentation).
≈There is a common emphasis on the visual and physical properties of the cured film. Requirements for gloss, color, finish (freedom from defects), and a specified dry film thickness (DFT) range for testing are core to both IS 13608 and its international counterparts.
≈Both the Indian standard and international equivalents specify tests for the powder in its unapplied state, such as gel time (stroke cure) and particle size analysis, as these are critical for controlling application behavior and cure consistency.
≈Basic chemical and corrosion resistance is a shared requirement. All standards include tests to assess the coating's barrier properties, such as resistance to humidity and salt spray, to ensure it provides adequate protection to the underlying substrate.
Parameter Comparison
ParameterIS ValueInternationalSource
Adhesion (Cross-cut)Classification 0 (No detachment)Classification 0 (No detachment)BS EN 12206-1:2021
Dry Film Thickness (for testing)50 - 70 micronsMinimum average 60 micronsBS EN 12206-1:2021
Pencil HardnessMinimum HPrimary test is Buchholz indentation (≥ 80); Pencil hardness often specified as ≥ FBS EN 12206-1:2021
Impact ResistanceNo cracking/detachment from 1kg at 1m (~9.8 Joules)No cracking/detachment after 2.5 Nm impact (2.5 Joules)BS EN 12206-1:2021
Salt Spray Resistance1000 hours (Neutral Salt Spray); Creepage ≤ 2mm from scribe1000 hours (Acetic Acid Salt Spray); More detailed assessment of blistering and creepageBS EN 12206-1:2021
Gloss Measurement (60°)Value to be agreed upon (e.g., >80 for high gloss)Tolerance around agreed nominal value (e.g., ±5 units for gloss >70)BS EN 12206-1:2021
Humidity Resistance1000 hours; No blistering or defects1000 hours (Constant humidity condensation); Max blistering rating 2(S2)BS EN 12206-1:2021
⚠ Verify details from original standards before use

Key Values6

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

Tables & Referenced Sections

Key Tables
Table 1 - Requirements for Epoxy Powder Coatings
Key Clauses
Clause 5 - Requirements
Clause 6 - Methods of Test
Clause 6.4 - Adhesion
Clause 6.5 - Flexibility and Adhesion (Bend Test)
Clause 6.7 - Resistance to Impact
Annex A - Sampling of Epoxy Powder Coatings

Related Resources on InfraLens

Cross-Referenced Codes
IS 101:1986Methods of sampling and test for paints, varn...
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IS 2379:1977Method for Estimation of Thermal Conductivity...
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IS 513:2018Cold Rolled Low Carbon Steel Sheets and Strip...
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IS 1070:1992Reagent Grade Water
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Frequently Asked Questions4

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).

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