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
Don Corleone greeted the baker with an embrace. They hadplayed together as children in Italy and had grown up infriendship. Every Easter freshly baked clotted-cheese andwheat-germ pies, their crusts yolk-gold, big around as truckwheels, arrived at Don Corleone's home. On Christmas, on familybirthdays, rich creamy pastries160 proclaimed theNazorines' respect. And all through the years, lean and fat,Nazorine cheerfully paid his dues to the bakery union organized bythe Don in his salad days. Never asking for a favor in returnexcept for the chance to buy black-market OPAsugar coupons161 during the war. Now the time had comefor the baker to claim his rights as a loyal friend, and DonCorleone looked forward with great pleasure to granting hisrequest.