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
A familiar voice called from the bandstand, "How about giving usa song, Johnny?" He looked up and saw Nino Valenti smiling down athim. Johnny Fontane jumped up on the bandstand and threw his armsaround Nino. They had been inseparable, singing together, going outwith girls together, until Johnny had started to become famous andsing on the radio. When he had gone to Hollywood to make moviesJohnny had phoned Nino a couple of times just to talk and hadpromised to get him a club singing date. But he had never done so.Seeing Nino now, his cheerful, mocking, drunken grin, all theaffection returned.