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
During the summer, preparing for the wedding of her best friend,Connie Corleone, Lucy heard the whispered stories about Sonny. OneSunday afternoon in the Corleone kitchen, Sonny's wife Sandragossiped freely. Sandra was a coarse, good-natured woman who hadbeen born in Italy but brought to America as a small child. She wasstrongly built with great breasts and had already borne threechildren in five years of marriage. Sandra and the other womenteased Connie about the terrors of the nuptial189 bed."My God," Sandra had giggled190, "when I saw that pole ofSonny's for the first time and realized he was going to stick itinto me, I yelled bloody191 murder. After the first yearmy insides felt as mushy as macaroni boiled for an hour. When Iheard he was doing the job on other girls I went to church and lita candle."