PFA Compression Molding

 

PFA Compression Molding


PFA (polyfluoroalkoxy) is a fully fluorinated, semi-crystalline copolymer of TFE and a minor amount of a PAVE (perfluoroalkyl vinyl ether), such as PMVE (perfluoromethylvinyl ether), PEVE (perfluoroethylvinyl ether), or PPVE (perfluoropropylvinyl ether).


The type and number of side chains provided by the comonomers determine the thermomechanical properties of the PFA polymer.  Generally, a high number of side chains will lower the thermal rating, melting point and creep resistance but will increase the tenacity (stress/strain at break) and the flex-life.


The bigger the side chains, the less comonomer is needed to modify the polymer backbone to the same degree, which allows the design of resins with higher thermal ratings.


Higher molecular weight leads to higher viscosity and a correspondingly lower melt flow index (MFI).  Lower MFI resins exhibit higher tenacity and higher flex-life.  Comonomers with bigger side chains can be used to offset the negative effect of low molecular weight (high MFI) on resins that would otherwise have lower tenacity and flex life.



PFA Properties


PFA combines the processing ease of conventional thermoplastic resins with the superior properties of PTFE.  The melt viscosity of PFA is over a million times lower than that of PTFE.


PFA offers the highest temperature rating and broadest chemical resistance of any melt-processible fluoropolymer, making it ideal for extreme chemical and thermal environments.  PFA is similar to FEP in many ways but in general has better mechanical properties at higher temperatures. 


PFA is one of the few plastics that is suitable for use in high-temperature and low-temperature applications.  Products made from PFA can operate at continuous service temperatures from -260 °C (-436 °F) to 260°C (500°F), similar to the range for PTFE.


  1. Excellent universal resistance to chemicals and solvents

  2. Superior creep resistance at upper service temperature

  3. Excellent stress crack resistance

  4. Low coefficient of friction

  5. More than 10 times the flex-life of FEP

  6. Excellent flexibility

  7. Smoother surface that PTFE or FEP

  8. Low gas permeability

  9. Available in high-purity grades with extremely low levels of extractable trace elements, fluoride ions and other anions

  10. Available in grades with increased permeation resistance

  11. Available in anti-static industrial grades

  12. Exceptional flame resistance, rated UL 94 V-0

  13. Resists ignition, has a limiting oxygen index (LOI) of greater than 95

  14. Some grades may be used in food contact applications in compliance with FDA 21 CFR 177.1550

  15. Excellent low-temperature toughness

  16. Extremely high weathering resistance and UV stability

  17. Exceptionally low dielectric constant and dissipation factor, like those of PTFE, but with dielectric strength more than four times higher than

  18. that of PTFE



PFA Applications


PFA is used for many applications that are similar to those in which PTFE and FEP are used, but PFA is particularly preferred for applications that require extended service in hostile environments with high chemical, thermal and mechanical stresses:

  1. Semiconductor processing equipment (due to superb chemical resistance and high purity/low extractables), where purity in the parts-per-

  2. billion range is needed

  3. Chemical processing industry (CPI) components

  4. Bulk chemical distribution

  5. Fluid-handling components

  6. Laboratory components



Compression-molded PFA Parts

  1. Fluid-handling components

  2. Valves

  3. Linings for tanks and vessels

  4. Fluid containers

  5. Pipes

  6. Wafer carriers

  7. Benches

  8. Sinks for wet benches

  9. Cabinets

  10. Filters

  11. Fittings

  12. Labware



PFA Compression Molding Resins


Teflon® PFA from DuPont™

  1. Teflon® PFA 340

  2. Teflon® PFA 345

  3. Teflon® PFA 350

  4. Teflon® PFA 9724

  5. Teflon® PFA 9725

  6. Teflon® PFA 416HP

  7. Teflon® PFA 440HP

  8. Teflon® PFA 440HPA

  9. Teflon® PFA 440HPB

  10. Teflon® PFA 445HP

  11. Teflon® PFA 450HP

  12. Teflon® PFA 451HP

  13. Teflon® PFA 940HP Plus

  14. Teflon® PFA 945HP Plus

  15. Teflon® PFA 950HP Plus

  16. Teflon® PFA 951HP Plus


Hyflon® PFA from Solvay Specialty Polymers

  1. Hyflon® PFA 420

  2. Hyflon® PFA M620

  3. Hyflon® PFA M640


NEOFLON™ PFA from Daikin America

  1. NEOFLON™ AP-230 PFA

  2. NEOFLON™ AP-231SH PFA

Perfecting Surfaces Since 1949   •

(714) 533-3183     info@thermech.com

PFA Compression Molding

 

Compression Molding and Machining of PFA.

 

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Compression Molding

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Aerospace Coatings

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Compression Molding Resins

FLUOROPOLYMERS

  PTFE / Teflon®

  PFA

  MFA

  FEP

  PCTFE / Kel-F® / NEOFLON™

  ETFE / Tefzel®

  PVDF / Kynar®

  ECTFE / Halar®

  TECfluorfil

ENGINEERED PLASTICS

  PEEK / VICTREX®

  PI / Vespel®

  PEI / ULTEM™

  PAI / Torlon®

  PPS / Ryton®

  PBI / Celazole®

  PES

  TECthermalon

FILLERS


Spray Coating Materials

THERMECH COATINGS

  TECfluorcote

  TECthermcote

DUPONT™ COATINGS

  Teflon® PTFE

  Teflon® FEP

  Teflon® PFA

  Teflon® One Coats

  Teflon® PTFE/PFA Blends

WHITFORD® COATINGS

  Xylan®

  Xylan® XLR

  Eclipse®

  Dykor®

  Xylar®


Powder Coating Materials

  Halar® ECTFE

  Teflon® ETFE

  Teflon® FEP

  Teflon® PFA

  Ryton® PPS

 

PTFE Etching and Bonding