Raw khoom muaj pes tsawg leeg thiab cov khoom ntawm PVC ntoo yas.PVC ntoo hmoov thiab ntoo fiber ntau thiab inorganic filling (calcium carbonate), lubricant, stabilizer, foaming agent, foaming regulator, toner thiab lwm yam additives (plasticizer, toughening agent, coupling agent), etc. 1, resin domes...
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