EVOLUTION® Isolation Gaskets

EVOLUTION® Isolation Gasket - The Future of Flange Isolation. Available Now!

EVOLUTION® is a patent pending product that is the first of its kind to be a fully encapsulated isolating gasket. The thinner, 1/8” (3mm) design minimizes the difficulties often encountered while attempting to install thicker isolating gaskets. The total encapsulation allows the gasket to be hydro-tested and kept in the pipeline with virtually no loss in isolation properties.

This innovative gasket is coated using a GPT proprietary material designed specifically for the oil and gas industry that is extremely abrasion and impact resistant. The coating is also chemically resistant to attack from H₂S, steam, CO, CO₂, and other chemicals found in oil and gas pipelines.

EVOLUTION® has passed API 6FB fire testing in multiple sizes and pressure classes and has a considerable increase in operating temperature over GRE products. Furthermore, EVOLUTION® does not have the permeation issues or chemical attack that plagues GRE gaskets.

Under harsh conditions, gaskets made from GRE may be vulnerable to chemical attack, blowout, thermal attack, hydrolysis and emissions —all of which can have serious consequences. EVOLUTION® is different. Its revolutionary materials and design provides industry-leading resistance to leakage and flange corrosion, as well as unprecedented levels of fire safety.

Unlike GRE gaskets, which are prone to delamination, EVOLUTION® has no laminations and as a result can better withstand high-pressure environments.

Rated to 500°F (260°C)*, EVOLUTION® can also operate under high temperatures. Tested comprehensively for safety, the product has API 6FB, 3rd Edition Fire Test recognition.

* When used with Mica sleeves and washers

Patent Pending PCT/US2018/016011

Redefining the isolation gasket.

FEATURES AND BENEFITS                    

316L Stainless Steel Core

  • Only three millimeters (1/8 inch) thick
  • Thinner profile helps make installation easier and more accurate

Proprietary Coating

  • High dielectric strength
  • Eliminates expensive exotic cores due to the fully encapsulated coating
  • Rated to 500°F (260°C)

*For higher temperature applications, please order MICA sleeves and MICA washers.

Inconel 718 C-Ring

  • Fire safe – provides the added security of knowing that the gasket has passed the API 6FB, 3rd Edition Fire Test in multiple sizes/classes
  • High pressure – extremely high pressure capability


  • Resistant to typical oil and gas chemicals, in particular H₂S, CO, & CO₂
  • Impermeable seal and encapsulated carrier eliminates the need to replace gaskets following hydro-testing
  • Larger than the pipe bore so that under compression it matches the pipe bore


  • The handle found on the EVOLUTION® allows each gasket to be holiday tested during manufacturing to insure strong isolation performance in the field
  • Helps ensure accurate alignment during installation
  • Provides traceability and identification for the product


  • Fire-safe flange insulation in conjunction with cathodic protection
  • Insulation between dissimilar metals to prevent galvanic corrosion
  • Wellhead isolation from inter-connected flow lines
  • Valve connections
  • Christmas Tree connections
  • Pump connections
  • Compressor connections
  • Mating mismatched ring-joint to raised-face flanges (EVOLUTION® will seal in ring-joint, raised-face and flat face/slip-on flanges)
  • Eliminate fluid trap corrosion between ring-joint (RTJ) flanges where high concentrations of CO2, H2S and other aggressive hydrocarbon media are present
  • Eliminate turbulence and flow-induced erosion between ring-joint (RTJ) flanges.
  • Full Face (Type E) Available 
  • To seal between flanges subjected to vibration/cavitation (i.e., compressor stations).
  • For slip-on flanges and coated flanges, please contact GPT engineering


Gasket Properties*             

Carrier: 316L stainless steel core                                          

Color:     Dark Tan with black handle                

                Fluid Services: Oil and Gas                  

                Maximum Operating Temperature (°F/°C): 500°F/260°C**

                Minimum Operating Temperature: (minus): -300°F/-184°C 

                Maximum Pressure Class: ASME 2,500#/API 5,000

“All component materials are rated for -300F or lower”

*Inert media exposure testing down to -277F

*Assembly functional testing down to -50C

Typical Physical Properties*   

Water Absorption (%): 0.03% ASTM D570 / D229
Taber Abrasion: 56mg  Mass Loss
Taber Abrasion:  11.3 Taber Wear Index
Compression Test: 180 MPa   EN 13555 @ 260° C
Creep Relaxation: 1.0  EN 13555 @ 260° C
Leakage Test: 1.0×10^-7 mg/m/s EN 13555 @ 40 bar Helium @ 135 Mpa gasket stress)
Hot Blowout Test:  No blowout   HOBT @ 260° C @ 62.3 bar
Dielectric Strength:   1100 Volts/ Mil   ASTM D149 (Short Time)
Tensile Strength Gasket: 70,000 psi  ASTM D638
Tensile Strength Dielectric Material: 24,000 psi  
Salt Spray Test:  2000 hours – No Visible Effect ASTM B117
Shell Leakage Test: 6.48×10^-12 PA-m^3/s/mm Tightness Class A MESC SPE 85/300-3.3.2 @ ambient @ 81.9 MPa (gasket stress) @ 51 bar (test pressure)
Shell Leakage Test: 3.08×10^-8 PA-m^3/s/mm Tightness Class B MESC SPE 85/300-3.3.2 @ 260°C @ 81.9 MPa (gasket stress) @ 42 bar (test pressure)
Shell Leakage Test: <0.1 bar (pressure drop) MESC SPE 85/300-3.3.2 @ 260°C @ 81.9 MPa (gasket stress) @ <0.1 bar (pressure drop)

Thermal Properties*

Coefficient of Linear Thermal Expansion (thickness tested .125”) X-axis / Y-axis: 10.0 / 13.0  (IPC-TM 650-2.4.24)                                    

  • Flammability Rating: Fire retardant   
  • Fire Testing: Passed per API 6FB       


This is a general guide and should not be the sole means of selecting or rejecting this material.

* Higher classes available upon request

** Temperature rating when using Mica sleeves/washers

All isolation products are affected by exposure to heat and moisture where electrical isolation is concerned. 

Please note that field values may vary from test values due to exposure to one or both of these environmental factors.


                                            Coating Scratch Test

EVOLUTION® Fusion Bonded Epoxy Xylan™
1400+ Passes before losing isolation 90 Passes before losing isolation  2 Passes before losing isolation

* 400 X Magnification

TEST METHOD: SH706 Manual Scratch Hardness Tester – ISO 1518-1, tungsten carbide hemispherical stylus, 2000g of weight. Product is scratched until isolation is lost.


Greenhouse gas reductions and carbon capture are hot topics and sure to be a focus of attention for years to come.  Traditional GRE gaskets are made of epoxy and glass fiber.  Gases travel very easily along the glass fibers making tight emissions difficult for GRE isolation gaskets.  EVOLUTION has dual seals on the inside diameter with no use of GRE.  This stops media from permeating at the source.  Where a typical G10 with stainless steel core isolation gasket might leak 3 cc of helium per hour, EVOLUTION’s leak rate is only 1 cc of helium every 10,000 years on average!

Due to the extreme tightness of EVOLUTION, EVOLUTION is a viable sealing solutions for the transportation of GHG’s( Methane, Halogens & C02) hydrogen, and LNG applications. 


Seal Types: Proprietary Coated C-ring (Standard), PTFE pressure activated seal (Standard)

Sleeves: G11 (Standard), Mica

WashersDH (Standard) Stainless Steel, Mica

Carrier Options: 316LSS (Standard)

Note: With Mica Sleeves and washers, the full kit is rated to 500F/260C. 

With G11 sleeves and DH washers, the full kit is rated to 392F/200C.

Flange Isolation Kits are designed to work in conjunction with our isolating gaskets to effect the complete electrical isolation of a flanged assembly. The Isolation Kits consist of one full-length isolating sleeve, two isolating washers and two steel washers for each of the bolts in the flange assembly. The purpose of the isolating sleeves is to electrically separate the bolts from each side of the flange, while the isolating washers provide electrical isolation for each of  the nuts attached to the bolts. This method of isolation provides the user with a high-reliability solution to complete the electrical isolation of a flanged joint.