久久激情5月丁香伊人_αv中文字幕女人乱码在线_成年人看的毛片在线观看_国产上床视频_精品亚洲国产黄片_三级日本黄页网站大全_国产美女精品网站_在线观看中文综合亚洲_男操女视频免费_亚洲中文字幕无码永久

　　1. Classification by resin properties.

　　2. Thermoplastics: plastics that can be repeatedly heated, softened, and cooled and hardened within a specific temperature range. Such as polyethylene plastic, PVC plastic.

　　3. Thermosetting plastics: plastics that can be cured into insoluble materials due to heat or other conditions. Such as phenolic plastic, epoxy plastic, etc.

　　4. It is classified according to the use scale of plastics.

　　5. General purpose plastics: refer to plastics with large output, wide use, good formability and low price. Such as polyethylene, polypropylene, polyvinyl chloride, etc.

　　6.engineering plastic: refers to the plastic that can accept certain external force, has good mechanical properties and dimensional stability, can maintain its excellent performance at high and low temperatures, and can be used as engineering structural parts. Such as ABS, nylon, poly alum, etc.

　　7. Special plastics: generally refer to plastics with special functions (such as heat resistance, self lubrication, etc.) and applied to special requirements. Such as fluoroplastics, organosilicon, etc.

This article is from Jiangmen engineering plastic:http://xrtsm.com.cn/