As we all know, sheath material plays an important role in protecting optical cable. The type of optical cable also changes with the variety of sheath material. If the sheath material uses low

In 2015, the European Union issued a new safety standard for electric tools en 62841-1:2015 "safety of hand-held, portable electric tools and garden tools - Part 1: General

Melamine tableware is made of melamine resin powder by heating, pressing and other molding process, which belongs to a kind of high molecular polymer. Compared with ceramic