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 had no desire, no intention, of letting hisyoungest son be killed in the service of a power foreign tohimself. Doctors had been bribed103, secret arrangements hadbeen made. A great deal of money had been spent to take the properprecautions. But Michael was twenty-one years of age and nothingcould be done against his own willfulness.He enlisted104 and fought over the Pacific Ocean. Hebecame a Captain and won medals. In 1944 his picture was printed inLife magazine with a photo layout of his deeds. A friend had shownDon Corleone the magazine (his family did not dare), and the Donhad grunted105 disdainfully and said, "He performs thosemiracles for strangers."