bmotiontechKF50 Stainless steel vacuum Centering Ring with O-ring = FKM viton - 10pcs pack KF-50 NW-50 Vacuum Stainless steel centering ring with Viton O-ringLot of 10 pcsKF50 Centering ring is made of stainless steel 304O-ring is made of FKM viton material.Viton Working temperature -15F to 400F -26C to 200CGood chemical resistanceO-ring color - Green  Centering Ring KF-50 Vacuum Fittings, ISO-KF Flange Size NW-50, Stainless Steel & VitonThese KF-50 Centering Ring vacuum fittings follow ISO-KF standards and have a flange size of NW-50.They are commonly used to build foreline vacuum plumbing and process systems.They are often called quick flange fittings because they are quick to assemble.A circumferential clamp and centering ring form the vacuum seal between the connecting flanges (please see top right figure - click to enlarge). The centering ring contains a rubber elastomer o-ring. The standard sizes for quick flange fittings are KF-10, KF-16, KF-25, KF-40, and KF-50 with flange sizes NW-10, NW-16, NW-25, NW-40, and NW-50, respectively.They are made of corrosive resistant stainless steel with Viton O-Ring.Viton is well known for its excellent resistance to heat (400F/200C) and to aggressive fuels and chemicals. Viton is a registered trademark of DuPont Performance Elastomers.O-Ring Material Reference GuideMaterialRecommended UseNot Recommended ForMechanical Properties    Buna-N(Nitrile)Standard: 70 Durometer BlackTemperature Range: -35F to 250FLeast Expensive / Readily AvailableSilicone Greases/OilsWaterPetroleum Oils / FuelsEthylene Glycol FluidsKetones (MEK)Halogenated HydrocarbonsAuto / Aircraft Brake FluidsStrong AcidsSunlight, Ozone, WeatheringGood Wear ResistanceGood Compression SetResistanceGood Short-Term ResilienceGood Permeation Resistance    VitonFKM FPM(Fluorocarbon Type A)Standard: 75 Durometer GreenTemperature Range: -15F to 400FVacuumMost Acids/ChemicalsHalogenated HydrocarbonsDi-Ester LubricantsPetroleum Oils / FuelsSilicone Oils / GreasesKetones (MEK)Auto / Aircraft Brake FluidsAmines (Ammonia)Acetone, Skydrol, Ethyl AcetateHot Water and SteamLow Molecular Esters and EthersGood Wear ResistanceExcellent Comp. SetResistanceModerate Short-Term ResilienceExcellent Permeation Resistance    SiliconeStandard: 70 Durometer OrangeTemperature Range: -65F to 450FDry HeatWide Temperature RangeSunlight, Ozone, WeatheringOdorless and Non-ToxicKetones (MEK)AcidsSilicone OilsBrake FluidsPoor Wear ResistanceExcellent Comp. SetResistancePoor Short-Term ResilienceExcellent Permeation Resistance    EPDM(Ethylene Propylene)Standard: 70 Durometer BlackTemperature Range: -60F to 250FSunlight, Ozone, WeatheringHot Water and SteamAuto / Aircraft Brake FluidsSome Acids and BasesKetones and AlcoholsPlumbingPetroleum OilsFuelsGood Wear ResistanceGood Comp. SetResistanceModerate Short-Term ResilienceGood Permeation ResistanceMaterialRecommended UseNot Recommended ForMechanical Properties    Chemraz/ Kalrez/ Simriz(Perfluoroelastomer)Various CompoundsDesigned for Specific ApplicationsTemperature Range: -10F to 615FHigh Temperature ResistanceExcellent Chemical ResistanceLow Out GassingChlorine Wet/DryPetroleum OilChlorinated HydrocarbonsMolten metalsGaseous Alkali MetalsHalogenated Freons/FluidsUranium HexafluorideGood Wear ResistanceGood Comp. SetResistanceModerate Short-Term ResilienceGood Permeation Resistance    Neoprene(Chloroprene)Standard: 70 Durometer BlackTemperature Range: -35F to 250FRefrigerants (Freon)AmmoniaSome Petroleum OilsDilute AcidsSilicone ester LubricantsKetones (MEK)GasolineAuto / Aircraft Brake FluidsGood Wear ResistanceModerate Comp. SetResistanceModerate Short-Term ResilienceGood Permeation Resistance    UrethaneStandard: 90 Durometer TranslucentTemperature Range: -65F to 200FDrive BeltsSome Petroleum OilsSome Hydrocarbon FuelsOxygen / OzoneKetones (MEK)AcidsAuto / Aircraft Brake FluidsChlorinated HydrocarbonsWaterExcellent Wear ResistancePoor Comp. SetResistanceExcellent Short-Term Resilience    FluorosiliconeStandard: 70 Durometer BlueTemperature Range: -80F to 450FJet FuelDry HeatWide Temperature RangeSome Petroleum OilsChlorinated SolventsKetones (MEK)Phosphate EstersSome AcidsAuto / Aircraft Brake FluidsAmines (Ammonia)Poor Wear ResistanceModerate Comp. SetResistanceModerate Short-Term ResiliencePoor Permeation Resistance    Teflon EncapsulatedO-Ring Covered with Teflon TubeUsually Silicone or VitonDepends on O-Ring CoreChemical ResistanceHeat ResistanceDepends on O-Ring CoreGood Wear ResistanceGood Short-Term ResilienceGood Permeation Resistance    TeflonStandard: Non-Elastic WhiteTemperature Range: -250F to 450FChemical ResistanceFuel ResistanceLow Coefficient of FrictionNon-ElasticGood Wear ResistanceLow Coefficient of FrictionMaterialRecommended UseNot Recommended ForMechanical Properties We only accept PayPal on eCRATER, this means you can rest assured your order will be with you ASAP after your purchase. For your security we only despatch your order to the address you provide us via PayPal.As soon as you pay, eCRATER & PayPal will email you to let you know it's been received and as soon as we've shipped your order, we'll let you know by email that it has been despatched and the tracking number if applicable. "We want you to be 100% happy with your purchase and offer a 14 day "no quibble" guarantee"If you change your mind, or the purchase is not suitable, you may notify us to cancel the contract within 14 days after the day of receipt of item(s) and you have a duty to take reasonable care of the item(s) until we receive the item(s) back. Return posting costs will be at your expense.Any Questions?Please check this listing page carefully as the answer is usually there. If not, let us know and we'll try our hardest to reply within one working day. "" ( ) "" ( ) "" ( ) "" ( ) "" ( ) 3.1210525804bmotiontech32251082958510-05-2017 04:35:5310-05-2017 04:35:53