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
Don Corleone knew who they were. His closest and mostintimate friends had been advised to attend the weddingin automobiles114 not their own. And thoughhe disapproved115 of his son's foolish display of anger,the tantrum served a purpose. It would convince the interlopersthat their presence was unexpected and unprepared for. So DonCorleone himself was not angry. He had long ago learned thatsociety imposes insults that must be borne, comforted by theknowledge that in this world there comes a time when the mosthumble of men, if he keeps his eyes open, can take his revenge onthe most powerful. It was this knowledge that prevented the Donfrom losing the humility all his friends admired in him.