免费看无码自慰一区二区,女同另类国产精品视频,天堂草原电视剧在线观看免费,日韩成人片免费永久在线观看网站,欧美国产精品一区久久,欧美一区二区性爱视频,一本无码aⅴ久久久国产,亚洲丁香五月婷婷

Because the adapter is basically used in the electronic and electrical field, which has high requirements for the mechanical function, electrical function, temperature resistance function and flame retardant function of engineering plastics, it is necessary for the engineering plastics used for the adapter to have the following characteristics: 1) stable contact resistance; 2) Good durability and long-term use; 3) Small size and light weight; 4) Excellent engagement and separation; 5) Outstanding electrical insulation function.

Excellent resistance: resistance is used to characterize the ability of data to absorb energy during plastic deformation and cracking. The better the resistance is, the less likely the brittle cracking of the data is. Generally, the bump resistance of the data is measured by the impact strength. The notch impact strength of the modified PBT engineering plastic used for the adapter is generally about 10-15kj/m2.

Outstanding fluidity: plastic powder or particles are melted at a certain temperature during plastic processing and molding, and then processed into plastic products of a certain shape through extrusion, injection molding, blow molding, film blowing, etc. The high fluidity of plastics means that more complex and thin-walled products can be planned, which makes injection molding easier and improves work efficiency.

Excellent electrical function: arc resistance represents the ability of data to resist deterioration caused by high-voltage arc effect. It is usually indicated by the time required for standard arc flame to cause carbonization on the surface of data to conduct electricity on the surface, and the arc disappears. The unit is second. The arc resistance time of PBT engineering plastics is significantly higher than that of PC materials. It has the same electrical function as nylon.

PBT engineering plastics have unique advantages in the field of adaptors: pc: easy to stress crack, lower heat resistance than PBT, but higher cost than PBT engineering plastics; PA: high water absorption, poor scale stability, and higher cost than PBT engineering plastics.

Article source: PBT engineering plastics http://www.wcyxs8888.com/