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
Sonny's heavy Cupid face grew red with anger. "Thoselousy bastards110, they don't respect anything." He left thesteps of the house and walked across the mall to where the blacksedan was parked. He thrust his face angrily close to the face ofthe driver, who did not flinch111 but flapped open hiswallet to show a green identification card. Sonny stepped backwithout saying a word. He spat112 so that the spittle hitthe back door of the sedan and walked away. He was hoping thedriver would get out of the sedan and come after him, on the mall,but nothing happened. When he reached the steps he said to hisfather, "Those guys are FBI men. They're taking down all thelicense numbers. Snotty bastards."