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
All of these people and many othersreceived engraved70 invitations to the wedding of MissConstanzia Corleone, to be celebrated71 on the lastSaturday in August 1945. The father of the bride, Don VitoCorleone, never forgot his old friends and neighbors though hehimself now lived in a huge house on Long Island. The receptionwould be held in that house and the festivities would go on allday. There was no doubt it would bea momentous72 occasion. The war with the Japanese hadjust ended so there would not be any nagging73 fear fortheir sons fighting in the Army to cloud these festivities. Awedding was just what people needed to show their joy.