Ngokwezinga le-ASTM, izinto ezihlukene ezinezinga lensimbi elihlukile, ngaphandle kwalokho, izakhiwo zazo zemishini nokwakheka kwamakhemikhali, izakhiwo ze-metallurgical zihlukile. Kukhona uhlu lwezinga le-astm elinebanga elihlukile lensimbi. Ukucaciswa Okujwayelekile kwe-ASTM A53 / A53M Yepayipi, insimbi, iBla...
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