The manufacturer, AT&M Biomaterial Corp., Ltd., has passed the certification of ISO13485:2003. aaAlloy Composition: ... 43%Ag, 32% The manufacturer, AT&M Biomaterial Corp., Ltd., has passed the certification of ISO13485:2003. ŸAlloy Composition ... ., Ltd.(www.atmbio.com) is the biomedical branch of Advanced Technology & Materials Corp., Ltd which is the main member of CISRI Group ...