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Copper alloy is an alloy formed by adding one or several other elements to pure copper as the matrix. Pure copper is purple red in color, also known as purple copper. Pure copper has a density of 8.96 and a melting point of 1083 ℃, exhibiting excellent conductivity, thermal conductivity, ductility, and corrosion resistance. Mainly used for making electrical equipment such as generators, busbars, cables, switchgear, transformers, as well as thermal conductivity equipment such as flat plate collectors for heat exchangers, pipelines, and solar heating devices. The commonly used copper alloys are divided into three categories: brass, bronze, and white copper.

WILLCOME 3 ply disposable surgical face masks are made of non-woven fabric and Melt-brown fabric,effectively block against fine particles in the air such as saliva, dust and pollen while not constricting air flow. The thickness of surgical face mask is very breathable and comfortable. 3 layer design protection breathable disposable surgical face mask with elastic ear-loops and adjustable nose clips, anti-dust protective cover mask bulk for adult, men, women,children, indoor, outdoor use.