Alfas(TFE/P)

Features: Good resistance to petroleum fluids, steam, acids, alkalies, and amines. This compound is used mainly in oil field, industrial and chemical applications.
Temperature Range: -23 to 400 F.
Limitations: High compression set at the upper temperature limit may make it unsuitable in some applications.

Butyl(IIR)

Features: This compound exhibits outstanding low permeability to gases, thus making it an excellent seal for vacuum applications. Also used in hydraulic applications where synthetic fluids are used.
Temperature Range: -50 to + 250 F
Limitations: Butyl has poor resistance to hydrocarbon solvents, oil and diester-based lubricants.

Chemraz* (PERFLUOROELASTOMER) (FFKM)

Features: Chemraz seals are virtually chemically inert and combined with high temperatures characteristics make Chemraz the ultimate seal. This compound is often used in aggressive chemical applications,  mechanical seals, and applications where microcontamination is a problem. Chemraz is available in both black and white colors, several compound variations and durometers. This compound is equivalent to E.I. Dupont’s® KALREZ.
Temperature Range: -20 to + 600 F
Limitations: High cost. Please consult with your SEAL & DESIGN salesperson for recommended compounds and chemical compatibilities.

*Chemraz is a Greene Tweed Product.

Ethylene Propylene (EPDM)

Features: EPDM is an excellent compound for stem and a variety of chemical applications. These chemicals include MEK, acetone and Skydrol.
Temperature Range: -60 to +300 F
Limitations: This compound is not to be used with most solvents, aromatic fuels or petroleum oils. This material can be made by a sulfer peroxide cured method. Peroxide cured gives the elastomer better physical properties specifically compression set.

Fluorosilicone

Features: This compound is often used in aerospace fuel systems and low temperature applications.Fluorosilicone exhibits good compression set and resilience properties.
Temperature: -80 to + 375 F
Limitations: This compound has poor tensile strength and poor abrasion resistance.

Metallic O-Rings

These seals are typically used in extremely high pressure and temperature applications where an elastomer would not work. They can only be in static seal applications.
Typical Materials: Tin, lead

Neoprene (CR)

Features:Neoprene is primarily used in applications when the seal is exposed to weathering refrigerants, silicate ester lubricants and high aniline point petroleum oils.
BUNA-N has replaced neoprene in most applications.
Temperature Range:-45 to + 250F
Limitations:This compound is not recommended for phosphate ester fluids or ketones.

Nitriles BUNA-N (NBR)

Features Excellent petroleum and oil resistance. Most commonly used of all O-Ring compounds. Great for low temperature hydraulic applications, and is considered inexpensive. F.D.A. compounds are also available.
Temperature Range:  -40 to +240 F
Limitations:Butyl has poor resistance to hydrocarbon solvents, oils and diester-based lubricants.

Carborylated Nitrile (XNBR)

Features:This compound has higher tensile strength and abrasive resistance than the standard Nitrile compounds. This compound is used primarily for dynamic applications.
Temperature:  -20 to + 240 F
Limitations: The low temperature limit is reduced.

Hydrogenated Nitrile(HNBR)

Features:This compound has better heat resistance, tensile strength, abrasion resistance, oil additive resistance.
Temperature Range:  -20 to + 260 F
Limitations:  The low temperature limit is reduced.

*In addition to these compounds the following nitriles are also available:

Internally Lubricated Nitrile

These compounds are available with a wax, teflon®, silicone, or graphite filler. The compounds have been developed to significantly reduce friction in dynamic applications.

FDA Nitriles

These compounds have been developed primarily for the food Industries, and are commonly availablein black or white elastomers. Other colors are available on request.

UL Nitriles

These compounds have been tested and approved by Underwriters Laboratory.

NSF Nitriles

These compounds are used where the elastomer is in contact with Drinking Water.

Silicone (MQ, PMQ, VMQ, PVMQ)

Features: This compound is used as a static seal in elavated temperature situations, dryheat and many Medical applications, Silicone has one of the widest temperature ranges of all elastomers. FDA and USP Class 6 compounds available.
Temperature Range:  -76 to 450 F
Limitations:Silicone has poor abrasion resistance and physical strength. It is not recommended for use in most petroleum fluids, ketones, or water and steam.

VITONS®* Fluorocarbon (FKM)

Features:This compound exhibits high temperature and low compression set characteristics. Flourocarbons also have excellent resistance to fuels and are also suitable for hard vacuum service.
Available in black and brown.
Temperature Range: - 20 to + 400 F
Limitations:This compound is not to be used in ethers, amines, skydrol fluids, hydrofluoric or chlorosulfonic acid applications.

*VITON® is a E.I.DuPont® tradename.

* In addition to this compound the following Vitons®* are also available:

926

Features: This compound was designed to handle problems with explosive decompression. It is Ideal for gas seal applications.
Temperature Range:  -20to + 450 F
Limitations: Only available in a 90 durometer compound

Viton®* GFLT

Features:This compound has better low temperature capabilities.
Temperature Range: -40 to + 450 F
Limitations:Higher cost and typically a non-stock item

Viton®* GFLT

Features:The GFLT compound offers improved chemical resistance as well as low temperature capability.
Temperature Range:- 40 to + 400 F
Limitations: High cost and typically a non-stock item

Polyurethane(AU, EU)

Features:Excellent abrasion resistance and tensile strength and is generally used in hydraulic cylinders and higher pressure situations.
Temperature Range:-40 to + 180F (dry heat)
Limitations: Not good at elevated temperatures and poor fluid resistance to acids, ketones, esters, and hydrocarbons.

Epichlorohydrin (ECO)

Features: Excellent resistance to ozone, outdoor weathering, low temperature situations, hydrocarbon oils and fuels
Temperature Range: -40 to + 275 F

Styrene Butadiene (SBR) (BUNA-S)

Features: Excellent resistance to brake fluids and waterTemperature Range: - 50 to + 210 F
Limitations: Not recommended for petroleum oils, hydrocarbons and ozone. Not normally produced in O-Ring form.

Vamac® (Ethylene Acrylic)

Features:Becoming an often used compound in the automotive market. Exhibits higher temperatures than Buna-n, outstanding resistance to UV, ozone, transmission fluids.
High tensile strenght and easy to process.
Temperature Range:  -40 to + 300 F
Limitations: Poor in acids, fuels brake fluid, and hydrocarbons