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
Johnny sighed. "I took care of them. After the divorce Igave Ginny and the kids more than the courts said I should. I gosee them once a week. I miss them. Sometimes I think I'm goingcrazy." He took another drink. "Now my second wife laughs at me.She can't understand my being jealous. She calls me anold-fashioned guinea, she makes fun of my singing. Before I left Igave her a nice beating but not in the face because she was makinga picture. I gave her cramps, I punched her on the arms and legslike a kid and she kept laughing at me." He lit a cigarette. "So,Godfather, right now, life doesn't seem worth living."