Search Loading
Home
Contact Us
 

Other Links

 



Please select a material

 

 Carboxylated Nitrile  CBX, XNBR

 

Trade names: 

Temp. Range: 

-20 C to +135 C
 -4 F to +275 F

Description: 

The addition of carboxylic acid groups to the NBR polymer backbone produces a polymer with increased strength, which provides a material with improved tensile and wear properties plus good abrasion resistance. The negative effects include reduction in compression set and water resistance, resilience and some low temperature properties. It is commonly used in dynamic applications and widely used for high pressure reciprocating seals, rod seals and rod wipers.

Suitable with: 

Aliphatic hydrocarbons (propane, butane, petroleum oil,mineral oils and grease, diesel fuels, fuel oils), LPG, water and glycol-based and (HFA, HFB and HFC) hydraulic fluids, vegetable oils

Not suitable with: 

Aromatic hydrocarbons (benzene, high octane gasoline, etc.), chlorinated hydrocarbons, polar solvents, glycol-based brake fluids, ozone and weather aging, stong acids, hot water, ozone, water, atmospheric aging
Back to the Top

 

 Chloroprene  CR

 

Trade names: 

DuPont - Neoprene

Temp. Range: 

-40 C to +121 C
 -40 F to +250 F

Description: 

Chloroprene (from DuPont) was the first synthetic elastomer material developed commercially. It exhibits generally good ozone, aging and chemical resistance. It also has good mechanical properties which it retains reasonably over a wide temperature range. It is commonly found as a seal material in compressed air systems and is one of the few elastomers with good resistance to R12.

Suitable with: 

Paraffinic mineral oils, silicone oils, water, refrigerants, ammonia, weather, ozone

Not suitable with: 

Aromatic and chlorinated hydrocarbons, polar solvents, toluene
Back to the Top

 

 Ethylene Propylene  EPM, EPDM

 

Trade names: 

Dow - Nordel, ExxonMobil - VISTALON, Uniroyal - ROYALENE

Temp. Range: 

-54 C to +150 C
 -65 F to +302 F

Description: 

There are two different types of EP rubber, EPM and EPDM. Ethylene propylene based materials are resistant to some fluids that cause problems with most other elastomers. The major limitation is the complete lack of resistance to hydrocarbon liquids. Therefore, they should be handled with some care in a work shop environment. Useful when sealing phosphate-ester hydraulic fluids and glycol based brake fluids. The major limitation to performance in high temperature applications is the air aging resistance.

Suitable with: 

Water, steam, phosphate ester (HFD-R and Skydrol), silicone oil and grease, polar solvents, glycol-based brake fluids, some acids and alkalis, ozone, air ageing

Not suitable with: 

Mineral oil products (oils, greases and fuels), air ageing and ozone at high temperatures
Back to the Top

 

 Fluorocarbon  FKM

 

Trade names: 

Chemours - Viton, Dyneon - Dyneon

Temp. Range: 

-26 C to +204 C
 -15 F to +400 F

Description: 

Fluorocarbons are a high temperature oil resistant elastomer capable of providing a very wide chemical compatibility range. There are several different fluorocarbon compounds available. The basis of the different compounds is the incorporation of fluorine into the polymer chain. As you increase the fluorine concentration within the polymer, the greater the chemical resistance of the compound. Fluorocarbons were originally developed as a dipolymer of hexafluoropropylene (HFP) and vinylidene fluoride (VDF). These comprise the Viton® A and GA polymers from Chemours. Hi-Tech's main compound is A-401C from Chemours, it is 66% fluorinated and bisphenol cured. It has good hydrocarbon and compression set resistance. Terpolymers were developed by adding tetrafluoroethylene (TFE) to the HFP-VDF co-polymer which results in 68% fluorine content. These are the Viton B grade. They provide improved fluid resistance but inferior compression set and low temperature performance. Viton GF compounds are also available and contain approximately 69-70% fluorine. Viton® low temperature compounds are also available. Viton® ETP is a Viton compound with extreme chemical resistance. Generally an increase in fluorine content provides improved fluid resistance but has been associated with a reduction of the physical properties.

Suitable with: 

Mineral oils and greases, HFD, silicone oils and greases, vegetable oil and grease, aliphatic and aromatic hydrocarbons, chlorinated hydrocarbons, gasoline, ozone, weather, ageing

Not suitable with: 

Glycol-based brake fluids, steam and hot water above 100 C, Skydrol, polar solvents, ammonia, methanol, amines, alkalis, organic acids
Back to the Top

 

 Fluorosilicone  FVMQ, FMQ

 

Trade names: 

Dow Corning - Silastic LS/FSR, GE Silicones - Silplus

Temp. Range: 

-56 C to +204 C
 -69 F to +400 F

Description: 

Fluorosilicone has fluorine added into the polymer chain in order to provide improved chemical resistance over silicone. Flurosilicone also has similiar mechanical properties to silicone. It has generally low tear strength, abrasion resistance, tensile strength and dynamic applications.

Suitable with: 

Mineral oils and greases, silicone oils, synthetic lubricants, ATF, brake fluids, water, alcohol

Not suitable with: 

Aromatic solvents, amines, phophate esters (Skydrol), concentrated acids
Back to the Top

 

 Hydrogenated Nitrile  HSN, HNBR

 

Trade names: 

Zeon - Zetpol, Bayer - Therban

Temp. Range: 

-40 C to +160 C
 -40 F to +320 F

Description: 

Hydrogenated nitrile is the result of a nitirile polymer being subjected to the hydrogenation process which has the effect of improving the resistance of the polymer chain to chemical attack. HNBR has a wider temperature range than standard nitrile and good mechanical properties. However, it will cost more than standard nitrile. HNBR is a High strength material that resists extrusion, abrasion and wear. It is popular for seal applications in the oil and gas industry, chemical industry, diesel engines and similiar high reliability aggressive environments. It has good ozone resistance which makes it compaitible with high temperature, high pressure compressed air systems. Low temperature compounds are available down to -54 C.

Suitable with: 

H2S (upto 10%), mineral oils and greases, LPG, fuel oils, water and steam upto 149 C, dilute acids, glycol-based hydraulic fluids, vegetable oils, ozone, ageing, weathering

Not suitable with: 

Glycol-based brake fluids, polar solvents, strong acids
Back to the Top

 

 Nitrile  NBR (Acrylonitrile Butadiene)

 

Trade names: 

Bayer (Canada) - Perbunan/Krynac, CK Witco Corp. (Mexico) - Paracril, Zeon Chemicals (U.S.) - Nipol/Nyson

Temp. Range: 

-40 C to +120 C
 -40 F to +248 F

Description: 

The acrylonitrile content of nitrile sealing compounds varies between 18% and 50%. The higher the acrylonitrile content, the better the resistance to oil & fuel. At the same time, elasticity and compression set properties are adversely affected. So a compromise is often made and a medium acrylonitrile content selected. It is presently the most widely used elastomer in the seal industry and provides an exceptional balance of good mechanical properties, wear properties and reasonable resilience.

Suitable with: 

Aliphatic hydrocarbons (propane, butane, petroleum oil,mineral oils and grease, diesel fuels, fuel oils), vegetable oils, LPG, fire resistant hydraulic fluids, water, dilute acids

Not suitable with: 

Aromatic hydrocarbons, chlorinated hydrocarbons, glycol brake fluids, stong acids (H2S), polar solvents, ketones, phosphate esters, ozone, weather, atmospheric aging
Back to the Top

 

 Perfluoroelastomer  FFKM

 

Trade names: 

DuPont - Kalrez, Simrit - Simriz, Greene Tweed - Chemraz

Temp. Range: 

-15 C to +310 C
 +5 F to +590 F

Description: 

Perfluoroelastomers are a development of fluoroelastomers where the polymer chain is fully fluorinated so no hydrogen is present. Due to the raw materials for the production of these compounds being very expensive the materials remain as high cost specialist compounds. They have the broadest chemcial resistance of any elastomeric material and very high temperature capability. They combine the sealing integrity of elastomers with chemical resistance approaching that of PTFE.

Suitable with: 

Most Media

Not suitable with: 

Liquid sodium and potassium, fluorinated solvents and refrigerants, some chlorine compounds, steam over 150 C depending on grade
Back to the Top

 

 Polyamide  PA

 

Trade names: 

DuPont - Nylon

Temp. Range: 

-30 C to +93 C
 -22 F to +200 F

Description: 

Nylon, from Dupont, was the first synthetic material to be developed (1938). Polyamide is a tough and abrasion resistant material which makes it useful for wear resistance in dry applications. It may be reinforced by fillers such as glass to provide higher strengh or could be filled with MoS2 to provide improved lubrication. A major limitation of polyamide is its high water absorption which leads to swelling of the material. Some major applications are wear rings, bushings and anti-extrusion rings.

Suitable with: 

Air, mineral oils and greases

Not suitable with: 

Water or high relative humidity, solvents, acids
Back to the Top

 

 Polyetheretherketone  PEEK

 

Trade names: 

Victrex - Victrex, Greene Tweed - Arlon, Quadrant - Ketron

Temp. Range: 

-70 C to +260 C
 -94 F to +500 F

Description: 

PEEK compounds have a temperature range similiar to that of PTFE but they have a much higher strength and also retain their mechanical properties to high temperatures. PEEK has good hydrolysis resistance and its chemical resistance is close to that of PTFE. PEEK is extensively used as a backup ring material for high pressure, high temperature applications dues to its hardness. A wide variety of grades are available including glass-filled PEEK.

Suitable with: 

Most Media

Not suitable with: 

Some acids including hydrochloric, nitric and sulphuric, some phenols and sulphur compounds
Back to the Top

 

 Polytetrafluoroethylene  PTFE

 

Trade names: 

DuPont - Teflon

Temp. Range: 

-200 C to +250 C
 -328 F to +482 F

Description: 

PTFE and its derivatives (ETFE, FEP, PFA) are perhaps the most widely used plastics in sealing technology. In unfilled (virgin) form it is relatively soft and will conform to the surface texture to provide a low leakage seal. PTFE has virtually universal chemical resistance and a very low coefficient of friction with excellent dry running properties. It is found in both dynamic and static seals. The different types of PTFE available are Virgin, Bronze, Glass, Moly-Glass and Carbon Graphite filled --these fillers are added to alter PTFE's sealing properties. NOTE: With filled PTFE the fluid resistance will be dictated by the filler material

Suitable with: 

Most Media

Not suitable with: 

Molten alkali metals, fluorine and other halogens, strong oxidizing agents
Back to the Top

 

 Polyurethane  AU, EU

 

Trade names: 

SKF - Lubrithane

Temp. Range: 

-54 C to +105 C
 -65 F to + 221 F

Description: 

Polyurethane is a thermoplastic elastomer and its tensile strength and wear resistance is typically 2-3 times higher than comparable elastomers such as nitirle. Polyurethane materials also have good resilience. Polyurethane will maintain effective dynamic sealing at high pressures for extended periods. It is widely used for both hydaulic and pneumatic reciprocating seals. The potential for plastic flow at high temperatures means polyurethane is not suitable for use as a typical rotary seal as the high underlip temperature will cause plastic flow. As polyurethane is a thermoplastic material it will only have elastomeric properties within a limited temperature range. At low temperatures it will have limited flexibility while at high temperatures it will be subject to plastic flow. Polyurethane suffers from hydrolysis in hot water and this can limit potential applications.

Suitable with: 

Most petroleum based fluids, water up to 65 C (149 F)

Not suitable with: 

Phosphate ester hydraulic fluids, solvents, alcohol, brake fluids, hot water, steam, alkalis, acids
Back to the Top

 

 Silicone  VMQ

 

Trade names: 

Dow Corning - Silastic, GE Silicones - Silopren and Silplus, Wacker - Elastosil

Temp. Range: 

-65 C to +232 C
 -85 F to +450 F

Description: 

Silicone elastmers possess a wide temperature range. Their major problem is the relatively poor tensile strength and tear resistance which in turn makes them susceptible to wear and also more prone to damage on assembly. They have excellent resistance to oxidation and ozone degradation. They are most commonly used in static applications and are popular for food and medical applications.

Suitable with: 

Mineral oils, vegetable oils, brake fluids, water, ozone, ageing, weather

Not suitable with: 

Aromatic hydrocarbons and solvents, water and steam (>120C), acids, alkalis
Back to the Top

 

 Tetrafluoroethylene-Propylene Copolymer  FEPM, TFE/P

 

Trade names: 

TM Asahi Glass Co. - Aflas, Greene Tweed - Fluoraz

Temp. Range: 

-9 C to +232 C
 16 F to +450 F

Description: 

This elastomer is a copolymer of tetrafluoroethylene (TFE) and propylene. The fluorine contributes to the good fluid resistance and temperature capability, but the ethylene base causes higher swell in hydrocarbon liquids than experienced with fluorocarbons. Aflas is found in numerous applications in the oilfield industry. Aflas has poor low temperature performance and low resilience.

Suitable with: 

Water, steam, methanol, amines, phosphate esters, brake fluids, ethylene glycol, acids (H2S upto 10%), mineral-based lubricating and hydraulic oils, some synthetic lubricants, air, ozone

Not suitable with: 

Lighter aromatic hydrocarbon liquids (gasolines), solvents such as benzene, ethers and ketones, chlorinated solvents and hydrocarbons, refrigerants, kerosene
Back to the Top

 

 Thermoplastic Polyester Elastomer  TPE

 

Trade names: 

DuPont - Hytrel

Temp. Range: 

-54 C to +149 C
 -65 F to +300 F

Description: 

Hytrel (TPE) is a thermoplastic elastomer material which has excellent strength and toughness properties. TPE can be made as a very flexible or relatively hard material depending on the grade. TPE is similiar to urethane. It demonstrates high resilience and flexiblity which permits easier installation than PTFE materials.

Suitable with: 

Mineral oils and greases, hydrocarbon fuels, water-based hydraulic fluids HFA and HFB, environmentally acceptable hydraulic fluids, glycol, dilute acids and bases

Not suitable with: 

Water and phosphate fluids above 80 C
Back to the Top