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
Lying back in his seat, Hagen went over all theinformation given to him that day. Jack Woltz was one of the threemost important movie producers in Hollywood, owner of his ownstudio with dozens of stars under contract. He was on the Presidentof the United States' Advisory309 Council for WarInformation, Cinematic Division, which meant simply that he helpedmake propaganda movies. He had had dinner at the White House. Hehad entertained J. Edgar Hoover in his Hollywood home. But none ofthis was as impressive as it sounded. They were all officialrelationships. Woltz didn't have any personal political power,mainly because he was an extreme reactionary310, partlybecause he was a megalomaniac who loved to wield power wildlywithout regard to the fact that by so doing legions of enemiessprang up out of the ground.