NORSOK M-710 Approved HNBR Sealing Material

NORSOK M-710 Approved HNBR Sealing Material

XploR™ H9T20 HNBR

Hydrogenated Nitrile Butadiene Rubber (HNBR) elastomers offer exceptional mechanical performance (high modulus / high strength), good abrasion resistance, low long-term compression set and long service life in aggressive media, including hydrocarbon and aqueous media common in oilfield applications.

XploR™ H9T20 HNBR elastomer from Trelleborg Sealing Solutions is a popular choice for RGD affected service conditions. Although no elastomer can be completely resistant to Rapid Gas Decompression, XploR™ H9T20 demonstrates best-in-class RGD in line with limits set by NORSOK M710 Rev. 2.

XploR™ H9T20 is suitable for use in oilfield applications such as Riser Connectors, Tubing Hangers, Packers, Downhole Tools, Flowline Equipment and Blowout Preventers (BOPs) where media compatibility and operating temperatures require a NORSOK Approved HNBR sealing material to be specified.

All international standard O-Rings, together with custom engineered solutions and specially designed seal profiles are available in XploR H9T20™ material from Trelleborg Sealing Solutions.

The NORSOK Standard

NORSOK M-710 – Qualification of non-metallic sealing materials and manufacturers (Rev. 2, Oct. 2001) – requires that all sub-components of oilfield equipment must be approved to stated specifications. Individual seal materials are rigorously tested and approved based on numerous criteria, significantly including Rapid Gas Decompression (RGD).

Rapid Gas Decompression
Rapid Gas Decompression (RGD) is a major concern to oilfield OEMs and operators. It can occur when applied system pressure is quickly released, causing absorbed gas to expand and potentially damage elastomer seals – leading to system failure.

Inherently, elastomer seals contain voids. Gas or gas mixtures in contact with elastomer surfaces are absorbed and will saturate elastomer seals. At high-pressure this absorbed gas is in a compressed state. When external pressure is reduced, either rapidly or over a relatively short period of time, the compressed gas nucleates at the voids, expanding within the elastomer.

The voids inflate, leading to high tensile stresses or strains in the void walls. Depending on the strength and hardness of the elastomer, this can cause the elastomer to break or crack.

Technical Specification

  Standard H9T20

Elastomer base





Service Temperature

-25°C to +160°C-13°F to +320°F

Excursion Temperature

+177°C / +350°F   

TR 10 Point

TBS 00036

-12°C / +10°F


DIN 53505

90+ / -5 Shore A



Specific gravity

DIN EN ISO 1183-1

1.25+ / -0.03

Tensile Strength

DIN 53 504

34.8 MPa / 5,050 psi

Elongation at Break

DIN 53 504


Modulus at 100%

DIN 53 504

16.6 MPa / 2,400 psi

Tear Strength

ISO 34-1


Compression Set 72 hrs / +150°C / +302°F

DIN ISO 815 Type B


Air Aging 70 hrs @ +150°C / +302°F 
Change in Hardness  Change in Tensile Strength 
Change in Elongation at Break   

DIN 53508

0 Shore A-5%-15%

Fluid Immersion Testing: Oil IRM 903 70 hrs @ +150°C / +302°F
Change in Hardness / Change in Volume

DIN ISO 1817

-11 Shore A / +15%

Fluid Immersion Testing: Water 70 hrs @ +100°C / +212°F
Change in Hardness / Change in Volume

DIN ISO 1817

 -1 Shore A / +1.9%

Fluid Immersion Testing: Methanol 70 hrs @ +40°C / +104°F
Change in Hardness / Change in Volume

DIN ISO 1817

 -13 Shore A / +13%
To discuss how NORSOK M-710 approved materials can enhance your design process, contact your local Trelleborg Sealing Solutions Marketing Company.