Auahatanga hinonga
I roto i ngā tau, i roto i te rapunga whakaaro o "Te Aroturuki Kounga, Te Arataki Hangarau", kua whakawhanakehia e te kamupene te phosgene wai parakore-teitei me te hanga i te kaihoko whakaora tetraisocyanate (7900#), te TPPT kounga teitei (tetraisocyanate phenyl ester) ...
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