First, awọn abuda: 1, Ga agbara, ga toughness, ga ti nrakò resistance, ga iyipo: wulo lati paipu paipu, isẹpo, àtọwọdá ara, bbl pẹlu diẹ ninu awọn ti abẹnu awon fun support ati aabo. 2, Ga otutu resistance, hydrolysis resistance, UV resistance: egbogi ẹrọ ...
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