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

What factors should be considered when selecting engineering plastics

2019-08-13 1248

  1. Mechanics

Form and size of stress, form and time of load, anti fatigue requirements, allowable deformation, overload and accidental stress conditions, impact resistance requirements, etc.

  2. heat

Normal operating temperature, maximum and minimum operating temperature.

  3. environment

Touch the conditions of solvents and various vapors, chemical reaction with acid and alkali, water absorption, UV and environmental oxidation, sand and rain corrosion, mold and microorganism.

  4. toxicity

Flame retardant, toner, additive or toxicity during decomposition.

  5. appearance

Transparency, appearance brightness, consistency and persistence of color.

  6. scale

Allowable error and scale stability, weight factor.

江門工程塑料

  7. production

Selection of processing technology, installation method, trimming and secondary processing, quality control and supervision.

  8. Economics

Material cost, mold cost, processing machinery cost, auxiliary equipment cost, operation cost, machinery maintenance cost, etc.

  9. statute

Safety rules (flame retardant, food, medicine).

Industrial rules (automobile industry, electronic industry, etc.).

  10. General structural parts

Requirements: there are no special requirements for strength and heat resistance. It is generally used to replace steel or other materials. The batch is large and high productivity is required. Low cost, sometimes have certain requirements for appearance.   

Source: Jiangmen engineering plastics http://xrtsm.com.cn/