|What is PTFE?||PTFE (polytetrafluoroethylene) has a low coefficient of friction and excellent thermal, electrical, mechanical and chemical properties making it suitable for a wide variety of demanding applications. It is commonly known as Teflon®. PTFE is essentially chemically inert. It will only react to molten alkali metals, liquid or gaseous fluorine, and a few fluoro-chemicals, such as chlorine tri-fluoride or oxygen difluoride. Note that PTFE tape contains oil products, and is NOT inert with oxygen.|
|What is PCTFE?||
It’s polychlorotrifluoroethylene, also known by the trade name Kel-F It has similar media compatibility to PTFE.
|What is PFA?||PFA (perfluoroalkoxy) is a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether. PFA retains many of the outstanding PTFE properties and is desirable for its melt processing ability.|
|What is PEEK?||PEEK (polyetheretherketone) is is a tough, high-temperature thermoplastic offering a unique combination of mechanical and thermal properties. Since it is a crystalline polymer, its resistance to chemical attack is excellent. It is not compatible with concentrated sulfuric acid and some strong oxidizers.|
|What is Grafoil®? (or graphoil)||Grafoil® is a registered trademark of UCAR International. It has unique physical and chemical properties that make it ideal for sealing in high-temperature applications. It is processed from naturally occurring graphite and is thermally stable and chemically resistant to attack from nearly all organic and inorganic fluids, with the exception of highly oxidizing chemicals and concentrated, highly oxidizing mineral acids.|
|What is Acetal?||Acetal polymers are strong, stiff and tough with good solvent resistance. They offer low levels of cold flow and creep over a wide range of loads and temperatures. Commercial trade names include Delrin, Fulton, POM, and Thermocomp.|
|What is Polyimide?||Polyimide engineered plastics have exceptionally good thermo-mechanical performance characteristics, making them ideal for structural parts for high-temperature environments. Commercial trade names include Vespel®, Torlon, and Ultem.|
|What is Fluorocarbon rubber?||Fluorocarbon (FKM) rubber has excellent chemical resistance. The polymer is sold under the trade names of Viton®, Dyneon , and others.|
|What is Highly Fluorinated Fluorocarbon rubber?||Highly Fluorinated Fluorocarbon (FFKM) rubber is an advanced version of fluorocarbon, also known as a perfluorinated elastomer. They are formulated for the most demanding chemical resistance applications.|
|Why do valves have different seal temperature ranges than published for the same seal material?||Seal temperature ratings are established by following standardized tests defined by ASTM. The tests are based upon testing the seal material in a static condition. Most valve seals are used in a dynamic mode. Product laboratory testing of the seal material in the valve established the temperature ratings.|
|What elastomer seals are used in valves when they are not identified in the valve nomenclature?||Fluorocarbon rubber seals are used for C Series Check Valves, F and FT Series Filters, HB Series Ball Valves, and VQ Series Toggle Valves.|
|What type of packing is used in valves when it is not identified in the valve nomenclature?||PTFE packing is the default for B Series Ball Valves and V, NP6, SN6, V4LC, and RV6LC Series Needle Valves.|
|What is the difference between BN103 and BN in a seal kit part number?||BN103 and BN are 2 different Nitrile rubber compounds. Typically, BN103 is used when operating temperatures are below 0deg F
BN103 is compound N103-70
BN compound is N0756-75
Valve part numbers that contain BN103 will require KIT-HB4XPKR-BN103-SS.
Valve part numbers that contain BN will require KIT-HB4XPKR-BN-SS
|What's the difference between Nitrile, NBR, and Buna-N?||Nothing, they're all the same|
|Can we use PTFE tape for oxygen service?||No. Standard PTFE tape contains oil products and can explosively combust.|
|Do Parker supply Anti-splash tape?||Anti-splash (or Spray Stop) tape is a tape used in ships to cover tubing and valves as a last resort protection against uncontrollled leaks. Parker do not supply this.|
|What is NIT90 or NIT-90?||It's an abbreviation for Nitrile 90|
|What is the minimum temperature for Phlex?||
We consider the minimum temperature to be the same as PEEK, at -54C.