Nou pwodwi chak pwodwi selon estanda li yo. Koulye a, nou gen mwazi yo pa sèlman pou estanda peyi Ewopeyen yo, men tou estanda Ameriken tankou DIN8077/8078, DIN8062, ISO4422, ASTM D2466, ASTM D2467, ASTM F439, ASTM F441, ASTM D2846, ASNZ2053, ISO50086, ASNZ1426, ASNZ1426, ASNZ1426. BS4346, BS5255, BS4514.
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