MATERIALS GUIDE

***SWAN ENGINEERING LLC’S MATERIAL GUIDE IS INTENDED FOR GENERAL MATERIAL INFORMATION ONLY. MATERIAL INFORMATION MAY VARY***

Nitrile (Buna-N)

The most widely used O-Ring elastomer for sealing products.  Excellent resistance to petroleum products.  Performs well with most dilute acids, silicone oils and lubricants and in water applications. Excellent compression, set, tear and abrasion resistance.  Not recommended for use with ketones, aromatic hydrocarbons and phosphate ester hydraulic fluids. Does not have good resistance to ozone, sunlight, or weather (unless specifically compounded).   Should not be stored in direct sunlight or near motors or other electrical equipment which may generate ozone. 
Temperature range:  - 40° to +250°F.

Fluorocarbon (Viton^®)
Excellent resistance to a wide variety of chemicals, weather and compression set requirements. .  Good resistance to petroleum products, low compression set, and high temperature resistance.  Wide spectrum of chemical compatibility.  Good for vacuum service and low gas permeability

Chloroprene (Neoprene^®)
Moderately resistant to petroleum products.  Good ozone and weather resistance.  Good compression set.  Excellent for sealing refrigeration fluids such as Freon^®.  Temperature range:  -65° to +250°F.

Silicone
Recommended for applications requiring a wide temperature range and good dry heat resistance.  Good weather and ozone resistance.  Limited oil resistance.  Not normally recommended for dynamic sealing applications due to relatively poor tensile and tear strength and relatively low abrasion resistance.  Temperature range:  -80° to +450°F.

Highly Saturated Nitrile (HSN, HNBR)
Better resistance to high temperatures, superior physical properties, and improved chemical resistance over traditional nitrile compounds.  Often used in automotive refrigeration systems. It also has better resistance to ozone, sunlight, and other atmospheric conditions.  Excellent resistance to compression set.  Green HSN is used in refrigerant R134a applications.  Temperature range:  -40° to +325°F.

Ethylene Propylene (EPR, EPDM, EPM)
Excellent resistance to Skydrol^® fluids used in commercial aircraft hydraulic systems.  Also recommended for hot water, steam, and phosphate ester type hydraulic fluids.  It provides low temperature flexibility for automotive applications including automatic transmission seals, power steering seals and gear box seals. Resistant to some acids, alkalis, and ozone.  Not recommended for petroleum fluids or diester lubricants.  Temperature range:  -65° to +300°F.

PTFE 
White thermoplastic fluoroethylene resin offers a combination of qualities not found in any other material ─ chemical inertness, heat resistance, low friction, dialectric strength, weatherability, zero water absorption, toughness, and flexibility. Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer of tetrafluoroethylene that has numerous applications. Temperature range:  -65° to +500°F.

Urethane (Polyurethane)
Resistant to petroleum oils, hydrocarbon fuels, oxygen, ozone, and weathering.  Particularly recommended for hydraulic systems where high pressures, shock loads, wide metal tolerances, or abrasive contamination is anticipated.  Not recommended for acids, ketones, and chlorinatied hydrocarbons.  Some urethanes are also sensitive to water and humidity. Temperature range:  -65° to +200°F.

Fluorosilicone (FVMQ)
Good low/high temperature resistance.  Excellent resistance to petroleum oils and fuels.  Used in aerospace applications for fuel systems and systems requiring resistance to diester base lubricants to +325°F.  Due to limited strength and abrasion resistance, this material is generally recommended for static applications only.  Temperature range:  -80° to +350°F (+400°F short term).