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
Abbandando fell back on the pillow. His eyes lost theirwild gleam of hope. The nurse came back into the room and startedshooing them out in a very matter-of-fact way. The Don got up butAbbandando put out his hand. "Godfather," he said, "stay here withme and help me meet death. Perhaps if He sees you near me He willbe frightened and leave me in peace. Or perhaps you can say a word,pull a few strings285, eh?" The dying man winked as if he weremocking the Don, now not really serious. "You're brothers in blood,after all." Then, as if fearing the Don would be offended, heclutched at his hand. "Stay with me, let me hold your hand. We'lloutwit that bastard as we've outwitted others. Godfather, don'tbetray me."