Potential fire and explosion hazards proof tools oxygen bottle wrench is a tool for flammable gas areas, made of aluminum bronze, beryllium copper alloy is widely used in petroleum, chemicals, etc., is also a good machinery manufacturing mechanical maintenance necessary special tools. these two qualities can play explosion-proof function, and where beryllium alloy products can also play a shielded functionality present in domestic production, sales and distribution of explosion tool to distinguish the material can be divided into two categories: 1. aluminum-copper alloy (commonly known as aluminum bronze ) proof tools, specific material is a high purity copper matrix by adding an appropriate amount of aluminum, nickel, manganese, iron and other metals, copper-based alloy composition 2. beryllium copper alloy (commonly known as beryllium bronze ) proof tools, specific materials based on high purity copper matrix by adding an appropriate amount of beryllium, nickel and other metals, copper-based alloy composition. these two thermally conductive properties of materials are very good L type wrench