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
Now the Don was mocking. "Because you acted like a finocchio.You gave her more than the court said. You didn't hit the other inthe face because she was making a picture. You letwomen dictate209 your actions and they are not competentin this world, though certainly they will be saints in heaven whilewe men burn in hell. And then I've watched you all these years."The Don's voice became earnest. "You've been a fine godson, you'vegiven me all the respect. But what of your other old friends? Oneyear you run around with this person, the next year with anotherperson. That Italian boy who was so funny in the movies, he hadsome bad luck and you never saw him again because you were morefamous. And how about your old, old comrade that you went to schoolwith, who was your partner singing? Nino. He drinks too much out ofdisappointment but he never complains. He works hard drivingthe gravel213 truck and sings weekends for a few dollars.He never says anything against you. You couldn't help him a bit?Why not? He sings well."