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
Right,' said George. She took a quick look at the ear. It wasstill covered by a piece of elastoplast, butit was quite obviousthat the ear was healthy. She cut the thread that bound the twoends of thecircular collar - and then bent16 it so thatit came off.
They all stared at Timmy, who looked most surprised. He wagged histail gently as if to say'Well - so you've taken off that thing - Iwonder why?'
'Oh Tim - you look sort of undressed without that collar now!' saidAnne. 'It is nice to see youwithout it, though. Good old Tim!You'll guard me and George tonight won't you? You know thatwe're inthe Middle of Something again, don't you?'
'Woof,' said Timmy, wagging his tail violently. 'Woof!' Yes - heknew all right!