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GB 24409-2009 is the national standard for limits of hazardous substances in automotive coatings. Published on 30 September 2009 and implemented on 1 June 2010, it aims to reduce harm to human health and environmental pollution from automotive coatings, meeting today's environmental protection needs and reflecting the move toward an environmentally friendly society. Implementation of this mandatory standard has effectively reduced volatile organic compound (VOC) emissions during vehicle painting and strictly controlled the use of highly toxic benzene, glycol ethers and heavy metals, playing an important role in protecting the environment and human health.
The standard specifies permissible limits of substances harmful to human health and the environment in original, refinish and component coatings for passenger cars, commercial vehicles, trailers and vehicle combinations, together with test methods, inspection rules, packaging markings and painting safety and protection. It applies to all types of automotive coatings except putties and special-function coatings; special-function coatings include PP water, anti-stone-chip coatings and blending solvents. Dacromet coatings are not covered. The entire standard is mandatory.
The standard divides automotive coatings into two classes: Class A solvent-borne coatings, further divided into thermoplastic, one-component crosslinking and two-component crosslinking types; and Class B water-borne coatings (including electrophoretic coatings), powders and UV-curable coatings.
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