一级特黄色片在线免费播放,久久精品一级一级片。,www高清无码精品极品,成人看黄A在线观看

How to modify plastics to flame retardant

Shengye
Due to the high oxygen index of PA66 resin and certain flammability, its application in various fields has been restricted. In order to increase the application scope of PA66 engineering plastics, its flame retardant properties should be further improved. There are many domestic researches on ... Read More

Application of polymer materials in various fields

Shengye
1. Application in machinery industry Polymer materials are more and more widely used in the machinery industry. “Plastic instead of steel” and “Plastic instead of iron” have become the hotspot and focus of material science research. This kind of research has broadened the range of ... Read More