PFA介绍 ：

氟塑料具有耐热、耐寒、耐候、耐药品、耐溶剂，绝缘性能及高频电性能优异．并具有不枯性、自润滑性、低磨擦系数等特点。聚四氟乙烯、全氟(乙烯—丙烯)共聚物(FEP)完全是由碳原子和氟原子组成的，而聚偏氟乙烯(PVDF)、聚氟乙烯(PVF)分子中还含有氢原子但熔融碱金属、氟、三氟氯化烃对它们有不同程度的影响。PCTFE、ETFE、PVDF等在氟塑料中耐药品性稍差，但比其他塑料的耐腐蚀性还是好得多。3．电性能氟塑料的电性能尤其是高频电性能是其他材料难以匹敌的。PTFE、FEP、PFA分子的极性很低，在很宽的温度、频率区间变化都很小、相对介电常数稳定、介电损耗很低，电绝缘性优异。其中PVDF还有特异的压电性和焦电性，可用来制造压电材料。4．机械性能 氟塑料分子中含氢、氯原子增加则其拉伸强度也有所提高。PTFE和PCTFE的脆化温度极低，显示出极好的低温性能。PTFE具有较低的摩擦系数和特异的自润滑性。但是PTFE又有自身磨耗大和冷流性等缺点。可采用填充各种填料以提高耐磨耗性，克服冷流性。不粘性氟塑料具有特异的不粘性。尤其象PTPE、FEP、PFA等分子中氟含量高，表面接触角非常大，使氟塑料制品表面上的液体成球状。不易与树脂粘接，故常用它制造炊具表面不粘徐层。6耐侯性 各品种的氟塑料都有优异的耐候性，即使在苛刻的温度下长期曝晒，其各种性能都没有变化. 7．憎水性氟塑料的吸水率低，尤以PTFE为甚。可利用它的憎水性制造透气不透水的复合织物和其他装备。

Teflon® PFA TE9725

Perfluoroalkoxy

DuPont Fluoropolymers

产品说明：

For inventory control purposes product name may be followed by an X.

Products labeled PFA TE9725 and PFA TE9725 X are equivalent and all information in this document is applicable to both.

Typical Application
DuPont™ Teflon ® PFA TE9725 is an ideal resin for applications involving compounding and compression molding, as well as extruded tubing and other profiles for hose, electrical insulators, and sleeving; industrial film and products made from film; and injection or blow-molded articles requiring superior electrical, chemical, and thermal properties. Teflon ® PFA TE9725 offers a slightly lower melt flow rate than Teflon ® PFA TE9724, ultimately providing a higher degree of stress-crack resistance.

Description
DuPont™ Teflon ® PFA TE9725 is a general purpose fluoroplastic resin available as loosely compacted fluff. It is intended for use in special application processes in consultation with DuPont. Compared with other grades of Teflon ® PFA, its most unique features are a relatively low flow rate and properties that make it suitable for a variety of processes and demanding end uses, especially compounding and compression molding. Table 1 shows the typical property data for Teflon ® PFA TE9725.

Teflon ® PFA TE9725 is used when traditional extrusion and molding processes are required for producing products with the superior properties of a fluoroplastic resin. Compared to other thermoplastics, the high melt strength and thermal stability of Teflon ® PFA TE9725 can be used to improve processing rates. Compared with other thermoplastics, Teflon ® PFA TE9725 provides a superior balance and level of end-use properties at high service temperatures. Teflon ® PFA TE9725 combines the processing ease of conventional thermoplastics with many properties similar to those of polytetrafluoroethylene.

Properly processed products made from neat Teflon ® PFA TE9725 resin provide the superior properties characteristic of fluoroplastic resins: chemical inertness, exceptional dielectric properties, heat resistance, toughness and flexibility, low coefficient of friction, non-stick characteristics, negligible moisture absorption, low flammability, performance at temperature extremes and excellent weather resistance.

In a flame situation, products of Teflon ® PFA TE9725 resist ignition and do not promote flame spread. When ignited by flame from other sources, their contribution of heat is very small and dded at a slow rate with very little smoke.

Teflon ® PFA TE9725 meets the requirements of ASTM D3307, Type II

物性信息：

聚三氟氯乙烯则还含氯原子。氟塑料的优异性能是由碳原子与氟原子间的高结合能实现。聚四氟乙烯的主链骨架是碳原子，而周围完全由氟原子包围，故其各种性能高，而PFA、FEP、ETFE等品种由于侧基的影响，软化点低子PTFE，其他性能也有所变化。1．热性能氟塑料具有难燃性和优异的耐热性。PTFE和PFA的连续使用温度可达260℃，短期可在300℃下使用FEP的使用温度要比它们低60℃。PCTFE的可在120℃下使用。氟塑料如长期在高温下使用会引起结晶度变化，在制造设备衬里时尤须注意。2．耐药品性氟塑料具有卓越的耐药品性和耐溶剂性，尤其是PTFE、PFA、FEP等，酸、碱、溶剂对它们均无浸蚀但熔融碱金属、氟、三氟氯化烃对它们有不同程度的影响。