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
grandfather’s house at Dumpling Green, East Dereham, his motherhaving found a natural refuge with her father while her husband wasbusily recruiting in Norfolk. The two children passed withtheir parents from place to place, and in 1809 we find them onceagain in East Dereham. From his son’s two books, Lavengro andWild Wales, we can trace the father’s later wanderings until hisfinal retirement34 to Norwich on a pension. In 1810the family were at Norman Cross in Huntingdonshire, when CaptainBorrow had to assist in p. 10guarding the French prisoners of war;for it was the stirring epoch35 of the Napoleonicconflict, and within the temporary prison “six thousand French andother foreigners, followers36 of the Grand Corsican, werenow immured3