PVC what's the bundle? It doesn't slip
PVC resin powder, by model. In our country, the most common is SG-5, then SG-3, SG-7, SG-8 and so on. So what is the distinction between various types, commonly used in industry or the viscosity value of K indicates the average molecular weight of PVC (or the average degree of polymerization), is the length of the molecular chain of PVC, to determine and distinguish between resin grades and corresponding processing parameters. The molecular weight of the resin is related to the physical and mechanical properties of the product.
PVC is polyvinyl chloride, it is one of the largest plastic products in the world. It is cheap and widely used. PVC resin is white or light yellow powder. It can not be used alone. It must be modified. PVC is an amorphous white powder with poor branching degree and poor stability to light and heat. Different additives can be added according to different uses, and polyvinyl chloride plastics can exhibit different physical and mechanical properties. A variety of hard, soft and transparent products can be made by adding proper amount of plasticizer in PVC resin.
In terms of product quality. The main difference between SG-8 and SG-7 resin is in viscosity number. Other indexes have little difference. In production, the risk coefficient of SG-7 resin is greater than that of resin. The production cost is basically the same as the SG-8 resin, SG-7 resin, which is slightly higher than the SG-7 type. Most enterprises indicate that the cost of SG-8 is slightly higher than that of SG-5, but there is a slight difference in the cost spread between the different enterprises. Need to and other types of enterprises, the cost is slightly higher than SG-8 type SG-5 type between 100-150 yuan / ton, but the line production enterprises said SG-8 and SG-5 costs less.
