G10 with SS 316L Core VCS Flange Insulation Gasket Kit — Style FIK 600-VCS — is a "Very Critical Service" gasket made for electrical flange heat retaining material and common sealing applications. The gasket is acceptable for use in raised-face, flat-face as well as RTJ flanges in all pressure classes, including API 15,000 psi support. In addition to its superior sealing attributes and excellent dielectric properties, the G10 with SS 316L core VCS flange insulation gasket kit is perfect for isolating flanges made out of different metals — thus mitigating galvanic corrosion — and for mitigating localized flange-face corrosion.
A G10 with SS 316L core VCS flange insulation gasket kit is a dual-seal insulating gasket that combines a glass-reinforced epoxy (GRE) body with a stainless steel metal core. The GRE body provides the electrical isolation; the SS 316/316L metal core provides the mechanical strength and the fire-safe metal-to-metal sealing element. Together they form a single gasket that seals the flange joint and electrically insulates it at the same time.
The VCS (Very Critical Service) designation reflects where this gasket is used: on the highest-pressure, highest-risk flange joints where a phenolic ring gasket has failed or where the operating conditions exceed the capability of a standard insulating gasket. The gasket was originally developed to replace phenolic ring gaskets that were failing in RTJ flanges, and it has since become the reference product for critical isolation joints in oil and gas, petrochemical and water transmission pipelines.
These parameters define the fit and performance envelope of the FIK 600-VCS. Confirm the exact size and pressure class on the enquiry.
The VCS kit is a complete flange isolation solution. Five components work together to seal the process fluid and electrically isolate the two flange faces from each other.
Insulation Gasket
G-10 or G-11 glass-reinforced epoxy body with an SS 316 metal core. Alternative metal cores such as duplex are also available for high-chloride or high-corrosion service.
Insulation Washers
Made from G-10, G-11, Mylar, Nomex, Mica or other insulating materials. These washers sit between the metal washers and the flange faces to complete the electrical isolation on the bolt side.
Metal Washers
Available in ZPS, XPS or stainless steel such as SS 316 and SS 304. The metal washers distribute the bolt load and protect the insulation washers from crushing.
Isolation Sleeves
Made from G-10, G-11, G-7 or Mica. Each sleeve fits inside a bolt hole to insulate the bolt from the flange metal — completing the electrical circuit break across the full joint.
Sealing Ring
PTFE spring-energized seal. This is the primary sealing element on the gasket bore, providing a resilient seal against the process fluid while maintaining electrical isolation.
Eight specific advantages make the FIK 600-VCS the reference isolation gasket for very critical service.
The FIK 600-VCS is specified wherever a flange joint must be sealed and electrically isolated at the same time, in a critical service where gasket failure would have significant consequences.
Q.01What is a G10 with SS 316L core VCS flange insulation gasket kit?
A G10 with SS 316L core VCS flange insulation gasket kit — Style FIK 600-VCS — is a dual-seal insulating gasket that combines a G-10 or G-11 glass-reinforced epoxy body with an SS 316/316L metal core. It is designed for Very Critical Service: high-pressure, high-risk flange joints where the joint must be electrically isolated across the flange. It is suitable for raised-face, flat-face and RTJ flanges in all pressure classes including API 15,000 psi.
Q.02Why is it called "Very Critical Service"?
The VCS designation reflects where this gasket is used — on the highest-pressure, highest-risk flange joints, where a phenolic ring gasket has failed or where the operating conditions exceed the capability of a standard insulating gasket. The gasket was originally created to provide an efficient sealing alternative for electric insulating material of vital flanges, specifically where phenolic ring gaskets had been failing in RTJ flanges. It was tested and approved by a major oil and gas company prior to initial service authorization and has been in operational service since 1981.
Q.03What pressure rating and flange types does the VCS kit handle?
The FIK 600-VCS is rated to API 15,000 psi and is suitable for raised-face, flat-face and RTJ flanges across all pressure classes. The dual-seal configuration is standard on nominal pipe sizes 6" and above. Sizes from 1/2" to 24" are standard, and sizes above 24" are also available on request.
Q.04What are the five components of the VCS kit?
The complete VCS kit contains five components. The insulation gasket — a G-10 or G-11 glass-reinforced epoxy body with an SS 316 metal core. The insulation washers — G-10, G-11, Mylar, Nomex or Mica. The metal washers — ZPS, XPS, SS 316 or SS 304. The isolation sleeves — G-10, G-11, G-7 or Mica. And the sealing ring — a PTFE spring-energized seal. Together, these five components seal the process fluid and electrically isolate the two flange faces.
Q.05When should I choose the VCS kit instead of a phenolic or standard G-10 insulation gasket?
Choose the VCS kit when the service is more demanding than a standard phenolic or G-10 insulation gasket can handle. Typical cases include high-chloride service where a plain stainless steel core is at risk of stress corrosion cracking; installations where electrical isolation testing is performed shortly after hydro-testing; applications where a larger flange gap is required to resist conductive sediment build-up; and critical RTJ flange service where phenolic ring gaskets have failed. The VCS is also the right choice when the flange material is exotic and you do not want to use an exotic metal core to match it.
Q.06What does the VCS kit cost?
The price for a VCS flange insulation gasket kit is higher than for a normal phenolic or plain G10 kit. VCS gasket pricing ranges from approximately USD 10 per set to USD 300 per set, depending on size from 1/2" to 24". Sizes above 24" are also available. Send us the flange size, pressure class and required material grade for a specific quotation.
Tell us the flange size (1/2" to 24", or larger), the flange type (raised-face, flat-face or RTJ), the pressure class, the gasket body material (G-10 or G-11), the metal core (SS 316, SS 316L or duplex) and the quantity. If you need the complete kit with insulation washers, metal washers and isolation sleeves, tell us the bolt hole size and the bolt count. If you are replacing an existing VCS kit, send us the current part number and we will match it.
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