Insulation Gasket

Insulation Gasket

Safeguard Your Flanges : Asian Sealing Products’ Insulation Gaskets

Asian Sealing Products offers high-performance insulation gaskets to prevent corrosion and ensure electrical isolation in demanding industrial applications.

Insulation gaskets are essential in flanged connections, particularly those involving dissimilar metals. They create a physical barrier to electrically isolate the flanges and prevent galvanic corrosion. This destructive process occurs when two metals with different electrical potentials come into contact in a corrosive environment. Asian Sealing Products’ insulation gaskets offer a reliable solution to this costly problem.

Applications and Challenges Addressed

Insulation gaskets are used in various industries:

  • Oil & Gas Exploration and Refining
  • Chemical Processing Plants
  • Power Generation Facilities
  • Water Treatment Plants
  • And many more

These applications often involve pipelines and equipment constructed from dissimilar metals. When these metals come into contact with a corrosive fluid, an electrical current flows between them, accelerating corrosion and compromising the system’s integrity. Insulation gaskets from Asian Sealing Products effectively address these challenges by:

  • Preventing galvanic corrosion between dissimilar metals.
  • Minimizing the risk of stray current leakage.
  • Enhancing overall system reliability and safety.

How Insulation Gaskets Work

Asian Sealing Products’ insulation gaskets are meticulously crafted from non-conductive materials, creating a physical barrier between the flanges. This barrier disrupts electrical continuity, preventing current flow and halting galvanic corrosion. Additionally, some gasket materials incorporate corrosion-inhibiting agents, further protecting the connected components.

Types of flange insulating gasket kits or insulation gasket:

Flange insulating gasket kits, vital in preventing corrosion and maintaining pipeline integrity, come in various types. Comprising materials like phenolic, neoprene, or laminate, these insulation kits serve diverse applications. Each type offers unique properties, ensuring effective electrical insulation, sealing, and protection against galvanic corrosion in critical industrial environments. The types Include:

  1. Type E (Full Face Type Gasket)
  2. Type F (Raised Face Type Gasket)
  3. Type D (RTJ Type Gasket )

Advantages of Asian Sealing Products’ Insulation Gaskets

  • Superior Electrical Isolation: Our gaskets ensure exceptional electrical isolation, effectively preventing galvanic corrosion and safeguarding the integrity of your flanged connections.
  • Enhanced Corrosion Resistance: Our gaskets’ non-conductive materials and corrosion-inhibiting agents significantly reduce corrosion rates, extending the lifespan of your equipment.
  • Wider Temperature Range: We offer insulation gaskets formulated to withstand various temperatures, ensuring optimal performance in various environments.
  • Reliable Sealing Performance: Our gaskets effectively seal the connection, preventing leaks and ensuring your system’s safe and efficient operation.

Material Options

Asian Sealing Products provides a variety of insulation gasket materials to cater to specific application needs:

  • Non-metallic composites offer excellent electrical isolation and chemical resistance, making them ideal for general-purpose applications.
  • Laminated materials with conductive cores combine electrical isolation with superior mechanical strength and are suitable for high-pressure environments.
Standards and Certifications

Our flange insulation gaskets meet or exceed relevant industry standards, ensuring their quality and reliability. We offer gaskets that comply with relevant ASTM standards and pressure ratings. Our insulation gasket kits adhere to industry standards, with ANSI B16.5 being a prominent specification governing range dimensions and materials.

Download our insulation gasket brochure  to explore the range of Asian Sealing Products’ insulation gaskets in detail. For application-specific recommendations,  contact our experienced team today. We are here to assist you in selecting the optimal insulation gasket solution to prevent corrosion and ensure the smooth operation of your system.


Product Details
  • Provides complete protection for both flange faces
  • Comes with the same outside diameter of the flanges. Hence, the foreign material collection between the flange faces is prevented
  • Ensures complete cathodic isolation
  • The E gaskets are available in Plain faced Phenolic, Neoprene faced Phenolic and high temperature material like G-10
  • Designed to fit only onto the raised face surface of the flanges
  • Outside diameter of the gasket is slightly lesser than the inside diameter of bolt circle
  • For best results, the flanges must be wrapped with Flange Band Protectors. So foreign materials are prevented from collecting and creating a bridge, thus shorting out the isolation
  • Available in same material as Type E
  • Designed to fit into the ring groove of RTJ flanges
  • Available in Phenolic and G10 material types
  • We use a machined glass-reinforced epoxy (GRE) resin with an O-ring or spring energised seal to produce this insulation set
  • These gaskets can be used for flange ratings from class 150 to 600
  • Improvises compressive strength over conventional insulation sets
  • Provides greater resistance to over compression and cracking
  • Highly reliable for both insulating and general sealing purposes in critical services
  • These gaskets have a proven track record of integrity in aggressive sealing situations
  • Suitable in all services up to and including ANSI 2500# and API 15,000# classes
  • Metal Core with G10/G11 gaskets consists of a PTFE (Teflon) spring-energized face seal, or an elastomeric o-ring
  • Accommodated in an insulating laminate that is permanently bonded to a high-strength metal gasket core
Flange Insulation Kit Gaskets - Insulation Materials Dielectric Strength & Temperature Details
Sl.No Insulation Materials Minimum Dielectric Strength Maximum Temperature
1 Phenoilc 500 volts/mil 120°C
2 Neoprene faced Phenoilc 500 volts/mil 120°C
3 G10 550 volts/mil 140°C
4 G11 550 volts/mil 180°C
5 Mylar 4000 volts/mil 149°C
6 PTFE 285 volts/mil 240°C


A flange gasket is a mechanical seal used to fill the space between two flanges in order to prevent leakage from or into the joined objects while under compression. Flanges are components used to connect pipes, valves, pumps, and other equipment in various industries such as oil and gas, chemical processing, water treatment, and more. Flange connections are widely used because they provide a secure and leak-resistant joint between two separate components.

Flange insulation gasket kits are widely used in industries such as oil and gas, petrochemicals, chemical processing, power generation, water treatment, and offshore installations.

A flange insulation kit functions by forming a barrier between the flange faces. It separates the flange components with insulating gaskets and sleeves, providing both physical and electrical insulation. 

The manufacturer usually specifies the thickness, but it can be customized to meet the specific needs of the project. Insulating gasket thicknesses can range from 1/16 inch (1.6 mm) to 1/4 inch (6.4 mm) or even thicker in some cases.

F, E, D, and O gasket isolation kits differ in terms of their design and construction- the geometry, materials, and thickness of the insulating components. Each type is designed to meet specific industry standards and requirements, with varying levels of electrical insulation and corrosion resistance.


The choice of gasket isolation kit depends on factors such as flange size, pressure rating, and the specific requirements of the application. It is advisable to consult with the manufacturer or supplier to determine the most suitable kit for your specific needs.

The properties of Phenolic gaskets are,

Property Value
Maximum axial compressive stress 45700psi [315MPa]
Axial electric strength in oil @ 1900F 58kV/in [23kV/cm]
Maximum operating temperature 2500F
Minimum operating temperature -760F