Hydrogenated Nitrile Rubber（HNBR）

Hydrogenated Nitrile Rubber(HNBR)

Hydrogenated Nitrile Rubber(HNBR) is a synthetic polymer that is obtained by saturating the double bonds in nitrile=s butadiene segments with hydrogen,and it is also called HSN(Highly Saturated Nitrile).This special hydrogenation process reduces lots of double bonds in main chanins of NBR polymer,thus HNBR possesses superior heat,ozone,chemical resistance and mechanical characteristics over standard Nitrile.

Acrylonitrile Content

Same as NBR,there are different levels of Acrylonitrile(ACN)content in different HNBR polymers.The CAN content can be varied from 17% to 49%.Lower CAN content gives better low temperature properties but poorer fuels and polar lubricants.Higher CAN content gives poorer low temperature properties but improves fuels and polar lubricants resistance.Standard HNBRs typically have 36% ACN content.

Cure system-Sulfur-Cured

HNBRs are usually Peroxide-cured for standard compounds of Ge Mao.It also can be Sulfur-cured to improve flexible properties in dynamic system but will reduce the heat resistance and cause poorer compression set.

Other Common Variations

●HNBRs are often internally lubricated to improve ease of installation or reduce friction for dynamic applications

●HNBRs can be formulated with only”white list”ingredients as specified in21.CFR 177.2600 for use in applications where the elastomer will be in contact with food or beverages

●HNBRs are usually used in automotive air conditioning system where R134a refrigerant gas or new refrigerant for environment protection like R401a,R404a ,R410a,R507andR744 is used.

●HNBRs are also used in automotive shaft system because of their excellent abrasion resistance.

●In deeper oil wells,it requires material resistance to heat,crude oil,hydrogen sulfide,steam and explosive decompressionetc.Special compounds of HNBR can be available for this application

Performs Well In…

●Petoleum based oils ＆fuels

●Aliphatic hydrocatbons

●Vegetable oils

●Silicone oils＆greases

●Ethylene glycol

●Dilute acids,bases＆salt solutions to moderate temperatures

●Water＆steam to150℃（300℉）

Doesnt Perform Well In…

●Chlorinated hydrocarbons

●Ketones

●Ethers

●Esters

●Strong acids

General Information

ASTM D1418 Designation

HNBR

ISO/DIN1629 Designation

HNBR or NBM

ASTM D200/SAE J 200 Codes

CH,DF,DH

Standard Color(S)

Black Green

Hardness Range

50 to 90 Shore A

Relative Cost

High

Service Temperatures

Standard Low Temperature

—40℃
—40℉

Standard high Temperature

150℃
302℉

Special Compound Low Temperature

—55℃
—67℉

Special Compound High Temperature

232℃
450℉