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See Chinese contents: GB/T 40237-2021 GB/T 40237-2021: Test method for ignitability of foamed plastic - Welding spark method
This document specifies the test method by using welding spark to impact the horizontally placed foamed plastic samples to measure its ignitability under laboratory conditions. This document applies to all kinds of rigid foamed plastics and flexible foamed plastics, such as polystyrene, polyethylene, polyurethane, phenolic aldehyde and other materials.
