This superior quality rubber has an outstanding resistance to higher octane and specialty unleaded fuels. It also resists very well to alkaline, acids and many other strong chemical products.


The 3R 856 is an ideal choice for sealing petroleum derivatives in high temperature applications.


Technical Data

Polymer Type Fluorelastomer (FKM)
Color Black
Hardness (Shore A) ± 5 75
Temperature -18°C à 200°C (0°F à 390°F)
Tensile Strength, lbs/in² 1650
Elongation minimum, % 165
Compression Set Very Good
Abrasion Resistance Good
Tear Resistance Fair to Good
Ozone Resistance Outstanding
Impermeability to Gases Excellent
Resistance to Dilute Acid Good to Excellent
Resistance to aromatic hydro-carbons Excellent
Heat Aging Outstanding
N.B. The information, details and values indicated are to the best of our knowledge. We recommend to conduct tests according to local conditions. The data is subject to some variations without notice.