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 third son, Michael Corleone, did not stand with hisfather and his two brothers but sat at a table in themost secluded99 corner of the garden. But even there hecould not escape the attentions of the family friends.
Michael Corleone was the youngest son of the Don and the onlychild who had refused the great man's direction. He did not havethe heavy, Cupid-shaped face of the other children, and his jetblack hair was straight rather than curly. His skin was a clearolive-brown that would have been called beautiful in a girl. He washandsome in a delicate way. Indeed there had been a time when theDon had worried about his youngest son's masculinity. A worry thatwas put to rest when Michael Corleone became seventeen yearsold.