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What is the C number of Tianjin V-type industrial film?

C5. Different types of films have different C types. V-type membrane belongs to C5 at present, which is a petroleum resin with excellent thermal stability and weatherability. Industrial film is the abbreviation of "industrial radiographic film". Industrial X-ray film is widely used for nondestructive X-ray inspection of equipment profile parts or welds made of ferrous metals, nonferrous metals and their alloys or other materials with small attenuation coefficient.