Parker Hydrogenated Nitrile (HNBR) O-Rings

Parker Hydrogenated Nitrile (HNBR) O-Rings Material Description:

Hydrogenated nitrile is a synthetic polymer that results from the hydrogenation of nitrile rubber (NBR). Superior mechanical characteristics, particularly high strength, helps reduce extrusion and wear.

Parker O-Ring Distributor

For over 50 years, Engineered Seal Products has partnered with Parker Seals. ESP is proud to be one of the FEW Premier Distributors to qualify as a "Parker Seal Technology Center (STC)".

What does Parker STC mean?

  • Proven Engineering Capability
  • Expert Material & Technical Support
  • ISO Quality Approval
  • Strong Financial Track Record
Parker (HNBR) Chemical Resistance::
  • Aliphatic hydrocarbons.
  • Vegetable and animal fats and oils.
  • HFA, HFB and HFC hydraulic fluids.
  • Dilute acids, bases and salt solutions at moderate temperatures.
  • Water and steam up to 149°C (300°F).
  • Ozone, aging and weathering.
Parker (HNBR) Not Compatible With::
  • Chlorinated hydrocarbons.
  • Polar solvents (ketones, esters and ethers).
  • Strong acids

Parker Hydrogenated Nitrile (HNBR) O-Ring Compound Numbering System::

Parker has one type of nomenclature used to reference Hydrogenated Nitrile (HNBR) products.

Polymer Code (Single Letter)
Special Property Description (Single Letter)
Sequence Number (Three Letters)
Durometer Indicator (Two Digits)

Special Property Descriptions:

General Purpose
Low Compression Set
Ethylene Acrylate or (Vamac®)
Fuel Resistant or Fully Fluorinated
Higher Fluorine Content
NSF/FDA/WRAS Approvals
Internally Lubed
Mil/AMS Specifications
Low Temperature Flexible
Non-Black Compound

Parker Hydrogenated Nitrile (HNBR) O-Ring Compounds:

Parker Compound Number Datasheet Hardness (Shore A) Low Temp High Temp Color Recommended For
KB190-50 (21705) PDF 50 +- 5 -25 300/325 Black Automotive Applications
N1173-70 PDF 70 +- 5 -25 300/325 Black General Purpose
KA158-70 PDF 70 +- 5 -40 300/325 Black Low Temp.
N1239-70 PDF 70 +- 5 -25 300/325 Red Refrigerants
KA157-70 (21407) PDF 70 +- 5 -30 300/325 Black General Purpose
KA174-75 (21107) PDF 75 +- 5 -25 300/325 Black General Purpose
N1231-80 PDF 80 +- 5 -25 300/325 Black Explosive Decompression
KA453-80 (21508) PDF 80 +- 5 -25 300/325 Black Low Swell, ED Resistant
KB162-80 (21378) PDF 80 +- 5 -25 300/325 Black Oilfield, High Temp, Hydraulics
KA183-85 PDF 85 +- 5 -55 300/320 Black Low Temp.
KB163-90 (21379) PDF 90 +- 5 -25 300/325 Black Oilfield, High Temp. Hydraulics, RGD Resistant, NORSOK M710
N4007-95 95 +- 5 -25 300/325 Black Extrusion Resistant, RGD Resistant, NORSOK M710

ASTM Designation
Shelf Life
15 Years
Hardness (Shore A) Range
50 - 95

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 ARP 5316 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.