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
Now as she ran up the steps toward Sonny a tremendous flash ofdesire went through her body. On the landing Sonny grabbed her handand pulled her down the hall into an empty bedroom. Her legs wentweak as the door closed behind them. She felt Sonny's mouth onhers, his lips tasting of burnt tobacco, bitter. She opened hermouth. At that moment she felt his hand come up beneath herbridesmaid's gown, heard the rustle193 of material givingway, felt his large warm hand between her legs, ripping aside thesatin panties to caress143 her vulva. She put her armsaround his neck and hung there as he opened his trousers. Then heplaced both hands beneath her bare buttocks and lifted her. Shegave a little hop113 in the air so that both her legswere wrapped