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
Don Vito Corleone was a man to whom everybody came forhelp, and never were they disappointed. He made no empty promises,nor the craven excuse that his hands were tied by more powerfulforces in the world than himself. It was not necessary that he beyour friend, it was not even important that you had no means withwhich to repay him. Only one thing was required. That you, youyourself, proclaim your friendship. And then, no matter how poor orpowerless the supplicant75, Don Corleone would take that man'stroubles to his heart. And he would let nothing stand in the way toa solution of that man's woe76. His reward? Friendship, therespectful title of "Don," and sometimes the more affectionatesalutation of "Godfather." And perhaps, to show respect only, neverfor profit, some humble gift--- a gallon of homemade wine or abasket of peppered taralles--- specially77 baked to gracehis Christmas table. It was understood, itwas mere78 good manners, to proclaim that you were in hisdebt and that he had the right to call upon you at any timeto redeem79 your debt by some small service.