Elastomer Technology

Low temperature performance

In order to provide transparency when comparing performance between compounds we have used two common laboratory test methodologies: Temperature retraction and Gehman torsional modulus.

Low temperature performance

Whilst these tests do not provide absolute figures for performance in application, they do offer a basis for the accurate comparison of low temperature capability between different materials.

TR10 temperature retraction (ISO 2921)
Material sample is stretched and cooled then allowed to retract freely as the temperature is raised. The temperature at which the sample has recovered by 10% is referred to as TR10.

T70 Gehman torsional modulus (ISO 1432)
The temperature at which an elastomer sample stiffens and the limit of technically useful flexibility is reached. This is commonly defined by a torsional modulus value of 70 MPa. These tests offer a degree of accuracy and are less susceptible to the flexibility of interpretation of other low temperature performance assessments.

Sealing capability testing
In an effort to provide greater clarity on materials capability James Walker uses a product configured test in an effort to determine the lowest possible temperature at which each material will effect a seal. We make this assessment using an O-ring in a constrained housing to replicate conditions of designed groove fill, squeeze and surface finish.

The results only relate to the product in the format and conditions tested and offer no accurate guidance to performance in application where the media, pressure, product design, housing design and housing surface finish will all have a bearing on performance.

It is our belief that, when selecting and specifying materials, relying solely on published low temperature claims utilising undisclosed test methodologies is unwise and potentially dangerous. The only true method to determine whether the low temperature sealing capability of a material will be suitable is to undertake product configured tests under conditions as close as possible to those found in application.

Establishing the operational low temperature performance of elastomers is a highly complex task and ultimately dependent on other application conditions such as pressure, seal configuration, storage, assembly and media. For this reason it is essential that customers discuss specific application conditions with the James Walker Technical Support Team.


Vermillion OneVermillion One
Ultra low temperature

Capability confirmed down to -60°C (-76°F) in product configured testing.

Vermilion One is a fluoroelastomer (FKM) with ultra-low temperature capability and excellent methanol resistance.

Providing excellent H2S resistance and typical FKM tolerance of aromatics and hot water, this material also offers good resistance to rapid gas decompression (RGD).

Approvals:

  • Norsok M-710 Annex A
  • Norsok M-710 Annex B
  • API 6A FF/HH

ArrowView our data sheet


Vermillion OneVermilion Five
Low temperature

Capability confirmed down to -55°C (-67°F) in product configured testing.

Vermilion Five is a next generation enhanced performance development of James Walker’s industry leading Elast-O-Lion 985 material.

This hydrogenated nitrile (HNBR) material offers excellent low temperature performance combined with good resistance to rapid gas decompression (RGD) and sour conditions.

Approvals:

  • Norsok M-710 Annex A
  • Norsok M-710 Annex B
  • API 6A FF/HH

ArrowView our data sheet


Elast-O-Lion 985Elast-O-Lion 985
Low temperature

Capability confirmed down to -55°C (-67°F) in product configured testing.

Elast-O-Lion 985 is a general purpose hydrogenated nitrile (HNBR) with superior mechanical properties, excellent low temperature capability and outstanding abrasion resistance.

This grade has now been superseded by our Vermilion Five material which offers the same market leading low temperature capability combined with enhanced resistance to RGD.

Approvals:

  • Total GS EP PVV 154/155

ArrowView our data sheet


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