Term Detail

Explanation

A mechanical property test to determine the hardness and softness of materials. The hardness of materials characterizes the ability of local area of surface of materials to resist compression deformation and fracture. There are two types of commonly used hardness test methods: ① indentation method, such as Brinell hardness hardness, Rock well hardness hardness, Vikers hardness hardness, micro hardness, etc.; ② Bouncing method, such as shore hardness hardness and Leeb hardness. For the former, the workpiece to be tested must be placed on the hardness tester sample table, a certain load shall be applied to press the indenter into the sample surface, the indentation area or depth shall be measured after unloading, and the hardness value shall be calculated according to the corresponding formula. The selection of hardness tester type, indenter size and load size shall be determined according to the nature and size of the tested materials. The test operation procedure and hardness value expression method shall be in accordance with relevant standards. Good data repeatability. It is widely used in production to evaluate the quality of materials and hot working process. Infer the strength, plasticity, wear resistance and machinability of parts. However, the comparison between strength and hardness is meaningful only when the composition and structure of the whole part are uniform. hardness test is a common nondestructive testing method with simple operation, small indentation and no damage to the workpiece. RPCV is made of PVC resin, impact modifier, thermal stabilizer, lubricant, filler, pigment, etc. impact modifier can be chlorinated polyethylene, acrylate copolymer, special EVA and ethylene carbon monoxide copolymer (polyketone), and the amount varies according to the variety, generally 4% -12%. heat stabilizer can be basic lead sulfate, organic tin compound, fatty acid calcium salt, barium salt or chromium salt, with the dosage of 0.5% -5%. The lubricant can be stearate, paraffin, low molecular polyethylene, etc., with the dosage of 0.1% -1%, and can be processed by various molding methods, such as extrusion, injection molding, calendering, laminating, etc. RPVC can make hard pipes, hard plates, profiled materials, chemical building materials, plastics doors and windows, various chemical equipment in the chemical industry, linings of various storage tanks and various anti-corrosion facilities. RPVC tube is the largest application field, widely used in drinking water pipes.