Spring Energized Seals for hydraulic fluid sealing. Designed for extreme and demanding applications.
A chart listing the most popular compounds and their fluid compatibility / technical information.
Seal & Design Canada: Toronto, Ontario 
Headquarters: Clarence, NY Polyurethane Sealing Materials (AU/EU)
One must differentiate between polyester urethane (AU) and polyether urethane (EU). AU type urethanes exhibit better resistance to hydraulic fluids. Polyurethane elastomers, as a class, have excellent wear resistance, high tensile strength and high elasticity in comparison with any other elastomers. Permeability is good and comparable with butyl rubber.
Both o-rings and gaskets can be made from EPDM materials.
Names: Polyurethane, Millable Polyurethane, AU, EU
Compound Info | |
| ASTM D1418 Designation | AU, EU |
| ASTM D2000/SAE J200 Type, Class | BG |
| Hardness (Shore A) | 40-90 |
| Color | black |
Thermal Properties | |
| Standard Min Temp. | -30°F (-34°C) |
| Max Temp. | 175°F (79°C) |
Chemical Resistance
Pure aliphatic hydrocarbons (propane, butane, fuel)
Mineral oil and grease
Silicone oil and grease
Water up to 125°F(50°C) (EU type)
Ozone and aging resistance
NOT Compatible
Ketones, esters, ethers, alcohols, glycols
Hot water, steam, alkalis, amines, acids
Disclaimer: These are general guidelines only. All materials should be tested in your application.
Headquarters: Clarence, NY
Seal & Design Canada: Toronto, Ontario
