聚甲醛塑料,俗称赛钢,为结晶性热可塑性塑料,具明显熔点165~175℃,性质Zui接近金属。
优点 1、具高机械强度和刚性
2、Zui高的疲劳强度
3、环境抵抗性、耐有机溶剂性佳
4、耐反覆冲击性强
5、广泛的使用温度范围(-40℃~120℃)
6、良好的电气性质
7、复原性良好
8、具自已润滑性、耐磨性良好
9、尺寸安定性优
缺点 1、加工过程若长时间高温下易起热分解
2、无自熄性
3、抗酸性差
4、成形收缩率大
用途 电子电器:洗衣机、果汁机零件、定时器组件
汽 车: 车把零件、电动窗零件
工业零件:机械零件、齿轮、把手、玩具、螺杆
The money in the envelope was sure to be more than anyoneelse had given. Brasi had spent many hours deciding on the sum,comparing it to what the other guests might offer. He wanted to bethe most generous to show that he had the most respect, and thatwas why he had given his envelope to the Don personally, agaucherie the Don overlooked in his own flowery sentence of thanks.Hagen saw Luca Brasi's face lose its mask offury, swell67 with pride and pleasure. Brasi kissed theDon's hand before he went out the door that Hagen held open.Hagen prudently184 gave Brasi a friendly smile which thesquat man acknowledged with a polite stretching of rubbery,veal-colored lips.