Clwyd reference ECO ASTM classification ECO Typical applications Automotive fuel systems Bladders Diaphragms Rollers Advantages Excellent resistance to oxidation Good resistance to ozone and weathering Excellent oil resistance Good, stable physical properties over wide temperature range (-50°C to 150°C) Low gas permeability Disadvantages Poor compression set limits use as sealing material Exhibits corrosive effect on metals (limits bonding applications) Available hardness range (Shore A) 40 - 90 Upper continuous service temp. 125°C Min. temp. for sealing applications -35°C Minimum non-brittle temp. -45°C Tensile strength (up to) 20 MPa Elongation at break (up to) 400% Price Bracket Very low ASTM 1 Oil Excellent ASTM 2 Oil Excellent ASTM 3 Oil Excellent Kerosene Excellent Liquid B None Liquid 101 Excellent Phosphate ester None Ketone None Toluene None Iso-octane Excellent Methanol Good Acid (weak) Average Acid (strong) None Base (weak) None Base (strong) None Hydrogen sulphide Good Steam None Ozone Excellent Radiation Good
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