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
I retired33 fromthe force last year. I’m on the board of a security company inOsaka now,’ said
Hideji, gazing eagerly at the glistening34 whiterice before getting to work with his chopsticks.
‘Sounds like they’ve sorted you out with a nice position. I have tosay though – you haven’t
changed a bit. Still got that sharp look in your eyes!’ saidNagare, meeting Hideji’s gaze.
‘The bitterness of these kikuna leaves works very nicely. A realKyoto flavour, isn’t it.’ Hideji
positioned the rest of the salad on top of his rice beforepolishing it off. Then he crunched on one
of the pickled cucumbers.