HNBR - Hydrogenated Nitrile Rubber

Clwyd reference	HNBR
ASTM classification	HNBR
Typical applications	Automotive seals and hoses Oil field packers Timing belts Engine grommets
Advantages	Superior to basic NBR Excellent physical strength and retention of properties after long-term exposure to heat, oil and chemicals Good ozone and water resistance Can be compounded to allow broad temperature range (from -30°C to 160°C)
Disadvantages	Low tensile properties Not recommended for use with ketones, esters/ethers and aromatic fuels

Available hardness range (Shore A)	50 - 99
Upper continuous service temp.	175°C
Min. temp. for sealing applications	-25°C
Minimum non-brittle temp.	-40°C
Tensile strength (up to)	30 MPa
Elongation at break (up to)	450%

Price Bracket	Low
ASTM 1 Oil	Excellent
ASTM 2 Oil	Excellent
ASTM 3 Oil	Excellent
Kerosene	Excellent
Liquid B	Good
Liquid 101	Excellent
Phosphate ester	None
Ketone	None
Toluene	None
Iso-octane	Excellent
Methanol	Excellent
Acid (weak)	Good
Acid (strong)	None
Base (weak)	Good
Base (strong)	None
Hydrogen sulphide	Good
Steam	Average
Ozone	Good
Radiation	Good