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
Michael laughed again. "Because they know that bytradition no Sicilian can refuse a request on his daughter'swedding day. And no Sicilian ever lets a chance like that goby."
Lucy Mancini lifted her pink gown off the floor and ran up thesteps. Sonny Corleone's heavy Cupid face, redly obscene withwiney lust24, frightened her, but she had teased him for thepast week to just this end. In her two college love affairs she hadfelt nothing and neither of them lasted more than a week.Quarreling, her second lover had mumbled188 somethingabout her being "too big down there." Lucy had understood and forthe rest of the school term had refused to go out on any dates.