Sealing Shielding

Making Strides Towards Liner Seal Technology

Making strides towards liner seal technology, heavy duty diesel engineParker Engineered Materials Group has developed a wide range of materials for liner seals to meet the demands of the ever increasing temperature requirements in liner seal applications. The new materials exhibit excellent coolant resistance, coupled with design capabilities to provide you a reliable, easy to assemble and efficient product. 

Material advancements by Parker

Parker has been one of the first in the market to develop a coolant resistant FKM (Viton). Over two decades, these materials have been used in multiple applications providing excellent chemical resistance to coolant, gear lubes, ATF and diesel. 

Why do you need a coolant resistant FKM?

In applications where the seal is prone to coolant attacks at higher temperature, a coolant resistant FKM is needed. As you can see in the picture below, a coolant resistant FKM will not be as susceptible to cracking and degradation as opposed to a standard FKM. 

Base resistant FKM Standard FKM
Coolant Resistant FKM Standard FKM






Development of CR FKM over the years

Parker has strived to develop the material over the years and has been successful in achieving coolant resistance at higher temperatures. As shown in the chart below, three generations of material development can be seen along with their performance at the higher temperatures. 

high temp material performance chart

high temp FKM table

Common liner seal cross sections

Some of the common liner seal cross sections are O-rings, D-rings and double chamfer seals. Each x-section has an advantage based on application conditions and production costs. 

Benefits of O-rings as liner seals

  • Excellent functionality

    • O-rings are industry standard for high pressure sealing

  • Standard sizes

    • AS568 through metric sizes available for easy sampling

  • Easy installation

  • Gland design software inPHorm

  • Lowest cost tools

heavy duty O-rings


Making strides towards liner seal technology, d-ring Benefits of D-rings

  • Flat ID adds stability

  • Standard and custom sizes readily available

  • ID and OD feature combinations


Making strides towards liner seal technology, double chamfer sealBenefits of double chamfer seals

  • Flat ID adds stability and can eliminate rolling and spiral failure

  • Can be used in reciprocating or oscillating and dynamic or static applications where better gland stability is desired

  • Standard and custom sizes readily available

  • ID and OD feature combinations


Value added options to help with identification and installation

Customer pain

  • Parts twisting during assembly

  • Difficult to identify on a large part

  • Problems during installation of seals

Making strides towards liner seal technology, double chamfer seal, cross sectionInnovative solution

  • Paint - clear visual after assembly to show correct installation

  • PTFE coated parts for ease of installation and Poke-Yoke

  • In addition, seals can be provided with chamfered or radius edges


For assistance with materials or which liner seal is best for your application, please contact our Applications Engineers via our live chat service on Parker O-Ring & Engineered Seals Division's website.




Vivek Sarasam



This article was contributed by Vivek Sarasam, heavy duty mobile senior applications engineer, Engineered Materials Group.






Related content:

Seals and the Quest for MPG

3 Guidelines to Ensure Proper Seal Installation

Proper Installation of an O-Ring: Standard Male Gland



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