CGA PS-9解决了纯铜和/或含铜合金在乙炔压力下形成爆炸性铜化合物的问题。根据多年的历史，给出了一般认为可接受的铜百分比的指南。

CGA PS-9 addresses the issue of explosive copper actylides formed as a result of pure copper and/or copper bearing alloys in the presence of acetylene under pressure. Guidelines are given as to the percentage of copper generally considered acceptable based on years of history.