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
The undertaker closed his eyes for a moment and then began tospeak. His voice was quiet, the voice he used to consolethe bereaved211. "I raised my daughter in the Americanfashion. I believe in America. America has made my fortune. I gavemy daughter her freedom and yet taught her never to dishonor herfamily. She found a 'boy friend,' not an Italian. She went to themovies with him. She stayed out late. But he never came to meet herparents. I accepted all this without a protest, the fault is mine.Two months ago he took her for a drive. He had a masculine friendwith him. They made her drink whiskey and then they tried to takeadvantage of her. She resisted. She kept her honor. They beat her.Like an animal. When I went to the hospital she had two black eyes.Her nose was broken. Her jaw was shattered. They had to wire ittogether. She wept through her pain. 'Father, Father, why did theydo it? Why did they do this to me?' And I wept." Bonasera could notspeak further, he was weeping now though his voice had not betrayedhis emotion.