... BETC-QC1-2009-304S), refer to GB/T50121-2005, GRP of thickness of 50mm, sound isolation is 28dB.Wonderful mechanical performance, which ... water, co2, co and dust, exclusive of nitride, sulfide, halogen or heavy metal. The product of combustion is low in toxicity, even lower ... than the one of pine, the result of smoke toxicity test is ...