For inventory control purposes, product name may be followed by an X. Products labeled PFA 440HPB and PFA 440HPB X are equivalent, and all  information in this document is applicable to both. 

Typical Applications  

Applications for Teflon™  PFA 440HPB include fluid handling components  for critical, high-purity processes, like semiconductor, pharmaceutical, and  biotechnology, as well as applications where purity in the parts-per-billion  range is needed. Teflon™  PFA 440HPB offers a slightly lower melt flow rate  than Teflon™  PFA 440HPA, ultimately providing a higher degree of stresscrack resistance. 

Description  

Teflon™  PFA 440HPB is a special purpose fluoroplastic resin available in  pellet form. This resin is a chemically modified form of Teflon™  PFA 340  that combines many of the benefits of the parent resin (a relatively high  typical melt flow rate of 14) with several additional benefits including  enhanced purity, improved thermal stability while processing, and chemical  inertness; for example, to ozonated fluids. Table 1 shows the typical  property data for Teflon™  PFA 440HPB. 

Teflon™  PFA 440HPB is a premium resin with the lowest level of  extractables designed to meet ultra-high purity requirements. Teflon™ PFA 440HPB has a relatively high melt flow rate for injection molding  and extrusion processes, and the highest level of inertness due to  stable end group polymer structure. The enhanced purity of Teflon™ PFA 440HPB makes it suitable for applications that require improved  color, lower extractable fluorides, and freedom from other foreign  materials. This product contains no additives and is designed for hostile  chemical environments where purity in the parts-per-billion range is  needed. Examples are in semiconductor manufacture, fluid handling  systems for industry or life sciences, and instrumentation for precise  measurements of fluid systems. Compared to other thermoplastics, the  high melt strength and thermal stability of Teflon™  PFA 440HPB can be  used to improve processing rates, combining the processing ease of  conventional thermoplastics with many properties similar to those of  polytetrafluoroethylene. 

Properly processed products made from neat Teflon™  PFA 440HPB  resin provide the superior properties characteristic of fluoroplastic  resins: chemical inertness, exceptional dielectric properties, heat  resistance, toughness and flexibility, low coefficient of friction, nonstick characteristics, negligible moisture absorption, low flammability,  performance at temperature extremes, and excellent weather resistance. 

In a flame situation, products of Teflon™  PFA 440HPB resist ignition and  do not promote flame spread. When ignited by flame from other sources,  their contribution of heat is very small and added at a slow rate with very  little smoke.