PAHs Testing

PAHs (Polycyclic Aromatic Hydrocarbons) are hydrocarbon compounds containing two or more fused benzene rings in their molecular structure. PAHs are widely found in petroleum, coal tar, asphalt, and other petrochemical products and their derivatives. Due to their carcinogenic, mutagenic, and reproductive toxicity, PAHs are listed as restricted substances under Annex XVII of the EU REACH Regulation (EC 1907/2006). The German GS Mark (Geprufte Sicherheit) imposes the most stringent PAHs restrictions, based on ZEK 01-08 and Af PS GS 2014:01 PAK evaluation standards, specifying limits for specific PAHs in consumer products. The US EPA also lists 16 PAHs as priority pollutants.

PAHs testing applies to the following products: plastic products (especially black plastic products such as PVC, ABS, rubber, etc.), rubber products (tires, handles, seals, rubber bands, etc.), products containing carbon black or asphalt (such as automotive interior parts, waterproof membranes, etc.), toys and children's products (plastic toys, teethers, etc.), food contact materials (plastic tableware, packaging materials, etc.), electronic and electrical products (wire and cable insulation, plastic housings, etc.), textiles (fabrics with rubber coatings), sports equipment (rubber grips, yoga mats, etc.), and tool handles and grips. PAHs typically originate from carbon black fillers, plasticizers, release agents, or residual impurities in petrochemical raw materials.

III. US EPA 16 Priority PAHs The US EPA lists 16 PAHs as priority pollutants (including most of the above substances). EPA limit requirements vary depending on specific product regulations.

The detection limit is typically 0.05 to0.1 mg/kg.

To apply for PAHs testing, the following documents are required: product name and model, list of parts to be tested (indicating material, color, location), sample quantity and dimensions, and applicable regulation description. Important Notes: PAHs mainly originate from impurities in petrochemical raw materials, especially carbon black, process oils, and asphalt. Using high-purity carbon black and release agents can effectively reduce PAHs content. PAHs testing is destructive and samples cannot be returned. GS certification PAHs requirements are stricter than REACH; if GS certification is needed, testing should follow GS standards. Different laboratories may have different detection limits for PAHs testing; it is recommended to use an ISO 17025 accredited laboratory. PAHs content in products may vary between raw material batches; it is recommended to establish a supplier material control system.