In order to prevent the line from catching fire, it is necessary to choose flame-retardant conduit.
PVC (polyvinyl chloride) is one of the largest plastic products in the world, which is cheap and widely used. PVC resin is white or light yellow powder, which cannot be used alone and must be modified. PVC is a white powder with amorphous structure, with low branching degree and poor stability to light and heat. Different additives can be added according to different uses, and PVC plastics can show different physical and mechanical properties. Adding a proper amount of plasticizer into PVC resin can make various hard, soft and transparent products. PVC resin is an amorphous linear polymer compound. The higher the relative molecular weight, the higher the viscosity, the higher the molecular weight, the higher the tensile strength, impact strength and elastic modulus, but the fluidity and plasticity of the resin melt decrease. The molecular weight of polymers is usually expressed by viscosity number, and the types of polymers are classified.