568 HNBR70

Seal Information (568 HNBR70)
MATERIAL :HYDROGENATED NITRILE (HNBR)
TEMPERATURE RANGE :-25°F (-32°C) TO +302°F (150°C) Depending on compound
PRESSURE RANGE :Varies based on Diametrical Clearance (See Chart)
PART NUMBER :(568) – (Dash No.) (HNBR 70)
Chemical Compatibility : – Petroleum-based oils and fuels – Ethylene glycol – Aliphatic hydrocarbons – Vegetable oils, animal fats & oils – Silicone oils and greases ethylene glycol – Water and steam – Diluted acids, bases, and salt solutions
Hydrogenated Nitrile, also known as HNBR, Highly Saturated Nitrile (HSN), is made of a synthetic polymer that is obtained by saturating the double bonds in nitrile butadiene segments with hydrogen. This special hydrogenation process reduces many double bonds in main chains of NBR polymers. Hydrogenated Nitrile was specifically developed for increased temperature resistance and better compatibility with new automotive fuels. Hydrogenated Nitrile also offers higher strength and minimal degradation at high temperatures. Specific physical and chemical resistances vary by compound formulation.

HNBR orings are usually peroxide-cured but can also be sulfur-cured to improve flexible properties in dynamic systems. However, sulfur-curing will reduce the heat resistance and cause an inferior compression set.
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