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
lodgings2 at 16 Milman Street, Bedford Row, and removedhimself elsewhere, and so Borrow was left friendless to fight whathe called his “horrors” alone. The depression wasnot unnatural3. From his ownvivid narrative4 we learn of Borrow’s bitter failure asan author. No one wanted his translations from the Welsh andthe Danish, and Phillips clearly had no further use for him afterhe had compiled his Newgate Lives and Trials (Borrow’s name inLavengro for Celebrated5 Trials), and was doubtlessinclined to look upon him as an impostor for professing6, withWilliam Taylor’s sanction, a mastery of the German language whichhad been demonstrated to be false with regard to his ownbook. No “spirited publisher” had come forward to givereality to his dream thus set down: