特性
（1）PEI的特点是在高温下具有高的强度、高的刚性、耐磨性和尺寸稳定性。（2）PEI是琥珀色透明固体，不添加任何添加剂就有固有的阻燃性和低烟度，氧指数为47%，燃烧等级为UL94-V-0级。（3）PEI的密度为1.28~1.42g/cm3，玻璃化温度为215℃,热变形温度198~208℃,可在160~180℃下长期使用,允许间歇使用温度为200℃。（4）PEI具有优良的机械强度、电绝缘性能、耐辐射性、耐高低温及耐疲劳性能和成型加工性；加入玻璃纤维、碳纤维或其他填料可达到增强改性目的。
PEI一指聚醚酰亚胺（Polyetherimide），它还指的是人员效率指标。 PEI （聚醚酰亚胺）是琥珀色透明固体，不添加任何添加剂PEI原料颗粒图片就有固有的阻燃性和低烟度，氧指数为47%，燃烧等级为UL94-V-0级，密度为1.28~1.42g/cm3。PEI具有很强的高温稳定性，即使是非增强型的PEI，仍具有很好的韧性和强度。因此利用PEI优越的热稳定性可用来制作高温耐热器件。具有优良的机械性能、电绝缘性能、耐辐照性能、耐高低温及耐磨性能，并可透过微波。
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详细说明：And then, after both girls had danced through one London season in different ball-rooms, Rachel’s parents died, her mother first, and then — by accident — her father, leaving behind him an avalanche of unsuspected money difficulties, in which even his vast fortune was engulphed.
Hard years followed for Rachel. She ate the bread of carefulness in the houses of poor relations not of high degree, with whom her parents had quarrelled when they had made their money and began to entertain social ambitions. She learned what it was to be the person of least importance in families of no importance. She essayed to teach and failed. She had no real education. She made desperate struggles for independence, and learned how others failed besides herself. She left her relations and their bitter bread and came to London, and struggled with those who struggled, and saw how Temptation spreads her net for bleeding feet. Because she loved Hester she accepted from her half her slender pin-money. Hester had said, “If I were poor, Rachel, how would you bear it if I would not let you help me” And Rachel had wept slow difficult tears, and had given Hester the comfort of helping her. The greater generosity was with Rachel, and Hester knew it.
