Is pvc graded?
PVC肯定有等级之分PVC板材是挤出成型的，非发泡的，质量等级分A级，B级，C级。
A级PVC板材比重1.5，全新料
B级PVC板材比重1.6，新料加适量填充料。
C级PVC板材比重1.6，优质再生料。
聚氯乙烯（PVC）本色为微黄色半透明状，有光泽。透明度胜于聚乙烯、聚丙烯，差于聚苯乙烯，随助剂用量不同，分为软、硬聚氯乙烯，软制品柔而韧，手感粘，硬制品的硬度高于低密度聚乙烯，而低于聚丙烯，在屈折处会出现白化现象。
There must be different grades of PVC. The PVC sheet is extruded and non-foamed. The quality grades are Grade A, Grade B and Grade C.
Grade A PVC sheet with a specific gravity of 1.5, new material
The specific gravity of Grade B PVC sheet is 1.6, and the new material is added with appropriate amount of filler.
Grade C PVC sheet has a specific gravity of 1.6, which is high-quality recycled material.
The natural color of polyvinyl chloride (PVC) is yellowish translucent and shiny. The transparency is better than polyethylene and polypropylene, but worse than polystyrene. It can be divided into soft and hard polyvinyl chloride according to the amount of additives. The soft products are soft and tough, and feel sticky. The hardness of hard products is higher than that of low density polyethylene, but lower than that of polypropylene. Whitening will occur at the bend.
常见PVC制品：板材、管材、鞋底、玩具、门窗、电线外皮、文具等。是一种使用一个氯原子取代聚乙烯中的一个氢原子的高分子材料。
Common PVC products: plates, pipes, soles, toys, doors and windows, wire skins, stationery, etc. It is a polymer material that uses a chlorine atom to replace a hydrogen atom in polyethylene.
