Freudenberg Hydrogenated Nitrile (HNBR) Material Description:
HNBR (hydrogenated-acrylonitrile-butadiene-rubber) is a material that is generated by full or partial hydrogenation of the double bond-containing butadiene portions of normal NBR polymers. Thus, HNBR offers a similar chemical resistance to NBR, but has better heat and oxidation stability. Furthermore, the material is characterized by high mechanical strength and improved abrasion resistance.
HNBR is often used in dairies, cheese-making facilities and other milk-processing plants, where the fat content of the product to be processed is so high that EPDM is no longer deployable.
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- Partly higher chemical resistance than NBR
- Better heat and oxidation stability than NBR
- High mechanical strength
- Improved abrasion resistance
- Can be used well in water, steam and ultrapure water
- Temperature-resistant from –30 °C to +150 °C (–22 °F to +302 °F)
ASTM D1418 Abbreviation |
HNBR |
ESP Recommended Shelf Life |
15 Years |
Hardness (Shore A) Range |
65 - 90 |
Temperature ranges will apply to the majority of media for which the material is potentially recommended. With some media however, the service temperature range may be significantly different. ALWAYS TEST UNDER ACUTAL SERVICE CONDITIONS.
ESP’s shelf life recommendation is based on the AS5316 standard and intended to be utilized by those organizations who do not already have specific recommendations for the control of elastomeric seals. It should be noted that the packaging of the elastomeric seals prior to assembly into a product is an integral part of the controlled storage procedure. It provides a positive means of product identity from the time of manufacture to the time of assembly.