优点:耐热耐寒防腐防酸碱化学稳定减磨耐磨无毒害机械性好低摩擦系数绝缘性自润滑性耐折性耐开裂性压缩强度好         我司供应以下产品：   PFA  AP-230 大金美国 用途： 其它 特性备注：低摩擦系数、高温强度、共聚物、良好的成型性能、良好的电气性能、耐气候影响性能良好、清晰度高、阻燃性能 重要参数： 熔体流动速率:1.5 g/10min 密度:2.14 g/cm3 吸水率:0.01 % 氧指数:95 % 拉伸强度:30.4 MPa 断裂伸长率:300 % 弯曲模量:580 MPa 硬度:60 生产厂商：大金美国公司    PFA AP-201 大金美国 用途： 薄壁制品 特性备注：低摩擦系数、高温强度、共聚物、良好的成型性良好的电气性能、流动性高、耐气候影响性能良好、清晰度高、阻燃性能 重要参数： 熔体流动速率:20 g/10min 密度:2.14 g/cm3 吸水率:0.01 % 氧指数:95 % 拉伸强度:24.5 MPa 断裂伸长率:350 % 弯曲模量:580 MPa 硬度:60 生产厂商：大金美国公司      介绍:   PFA结晶料,吸湿小。可采用通常得热塑性塑料得加工方法加工成制品。   PFA流动性差，极易分解，分解时产生腐蚀气体。宜严格控制成型温度不要超过475度，模具应加热至度，浇注系统对料流阻力应小。   PFA是半透明粒料，注塑、挤出成型。成型温度度，475度以上容易引起变色或发生气泡。并注意脱模会较困难。     详解:    wholly and toppled to the floor. Morrel bounded to the door, opened it, and found Valentine stretched out at the bottom of the stairs. Quick as a flash, he raised her in his arms and placed her in a chair. Valentine opened her eyes.  "Oh, what a clumsy thing I am," said she with feverish volubility; "I don't know my way. I forgot there were three more steps before the landing."  "You have hurt yourself, perhaps," said Morrel. "What can I do for you, Valentine­" Valentine looked around her; she saw the deepest terror depicted in Noirtier's eyes. "Don't worry, dear grandpapa," said she, endeavoring to smile; "it is nothing -- it is nothing; I was giddy, that is all."  "Another attack of giddiness," said Morrel, clasping