久久久亚洲东京热|精品欧美一区二区三区|久久久久国产精品三级|精品乱码一区二区三区四区|精品国产理论在线观看不卡|九九热欧美久久久午夜视频|精品一级国产一区二区三区7|欧美性爱亚州最新一区二区三区

Engineering plastics is a general term of plastics with outstanding performance in all aspects. It can replace many traditional raw materials such as copper, steel, wood and so on as a new type of plastics.

Although China has mastered many production principles of engineering plastics, there is a large gap with foreign advanced technologies in terms of technical control, production equipment and development strength, so there will be some differences, even in quality, mainly as follows:

1. Quality gap: the quality of domestic engineering plastics is relatively poor, and there is no sense of quality of imported plastics;

2. Purity gap: purity has always been the weakness of domestic engineering plastics;

3. Production technology gap: due to the lack of technological breakthrough in China, the production technology is relatively backward and the uniformity of product quality is poor;

Of course, domestic engineering plastics are also catching up. I believe that in the near future, after facing up to our shortcomings, China' s engineering plastics will have considerable progress and great development.

Source: Jiangmen engineering plastics http://www.6936yh.com/