Oil and gas industry

Subsea oil sources are moving further down and the digging holes in deep sea levels will add more thermal stress to sealing materials. VESTAKEEP® PEEK shows the combination of mechanical toughness and relaxation to alternating pressure.

PEEK performance under HPHT conditions

In response to industry demand for higher performing polyether ether ketone materials, Evonik offers VESTAKEEP

5000 series PEEK compounds. These compounds are based on our speciality high

molecular weight polymer that offer excellent combination

of properties:


  • Superior toughness, ductility and fatigue


  • Excellent chemical and wear resistance

  • Excellent long term performance under HPHT

    and sour gas conditions

  • Easy to process and machine parts

  • Flame retardance, low smoke and toxicity

Better seal performance with VESTAKEEP® PEEK

The ductile nature VESTAKEEP

PEEK offers the right performance combination for back-up rings and seals in a seal pack application. In such applications the elastic recovery of VESTAKEEP

PEEK leads to a perfect seal with no leakage. By comparison, competition PEEK’s

elastic recovery is much lower due to permanent plastic deformation normally associated with a less ductile material. VESTAKEEP

PEEK grades, thus offer exceptional performance under severe conditions

such as chemicals (sour gas), high pressure, high temperature (HPHT), dynamic loads and complex assemblies.

VESTAKEEP® PEEK offers superior ductility, crack resistance, toughness, low temperature Impact and higher mechanical performance at elevated temperatures than competitive PEEK grades.

VESTAKEEP® recommended product range




Back-up rings

L4000G, 5000G, 4000GF30, 4000CF30

Other components

L4000G, 5000G/ GF / CF

Compressor parts

L4000G, 5000G, 4000GF30 /CF30, 5000CF30, 4000FP, 5000FP


L4000G, 5000G 

Pipes, liners



L4000G, 5000G



Nishant Negandhi