Sezvo polyurethane rigid foam (PU rigid foam) ine hunhu hwehuremu huremu, yakanaka kupisa kwemafuta ekudzivirira, kuvaka kuri nyore, nezvimwewo, uye zvakare ine hunhu hwakanakisa senge kuvharwa kweruzha, kushomeka kwemagetsi, kudzivirira kupisa, kutonhora kwechando, solvent. zvakare...
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