Polyurethane sealing mgbanaka e ji eyi iguzogide, mmanụ, acid na alkali, ozone, ịka nká, ala okpomọkụ, tearing, mmetụta, wdg Polyurethane sealing mgbanaka nwere nnukwu ibu na-akwado ikike na-eji ọtụtụ ebe dị iche iche ubi. Na mgbakwunye, mgbanaka akara nkedo na-eguzogide mmanụ, hydrolysi ...
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