Flange isolating gasket kits (also called flange insulation kits or isolation kits) are used to electrically isolate two flanged pipe sections while still maintaininga pressure-tight seal. They are commonly installed in pipelines, refineries,gas transmission systems, water treatment plants, and cathodic protection systems to prevent galvanic corrosion and stray-current damage. Astandard kit usually includes:

An insulating gasket
Insulating sleeves for bolts
Insulating washers
Steel backup important selection criteria are pressure class, flange type (RF/FF/API RTJ), gasket material, electrical resistance, and **temperature/render_as":"hero","description":"Industrial-grade G10 glass-epoxy isolation kit

The G10 glass-epoxy material offers strong dielectric strength, moisture resistance, and mechanical durability. These kits are widely used in cathodic protection systems","Lamons Isotek IK-6.0-IG-150 Flange Isolation Kit",{"render_as":"block","description":"ANSI Class 150 flange isolation kit with G10 components suited for refinery and in the oil & gas sector for reliable sealing and electrical isolation performance. Good choice for standard firesafe flange isolation kit using PTFE and In

This type of kit is intended for aggressive media, high reliability requirements Systems EN 4" Isolation Kit",{"render_as":"block","

A practical lower-cost option for maintenance teams needing basic flange electrical isolation without premium sealing Flange Isolation Kit",{"render_as":"block","description":"API-style flange isolation kit designed for|---| | Typical use | General industrial pipelines | ANSI refinery/pipeline service | Critical/fire-safe service | Maintenance/general duty | API wellhead/upstream | | Isolation material | G10 glass epoxy | G10 laminate | PTFE/Inconel/G11 | Phenolic | G10STV | | Pressure class | ANSI 150 typical | ANSI 150 | ANSI/API high performance| ANSI standard | API pressure class | | Corrosion protection | High | High | Very high |Moderate | High | | Chemical resistance | Good | Good | Excellent | Moderate | Good | | Best feature| Balanced performance | Trusted industrial brand | Premium sealing/fire-safe | Low cost | APIcompatibility |

Common flange isolation kit types

Type E (Full-face)
Covers theentire flange face including bolt holes. Used mainly on flat-face flanges.
Type F (Ringgasket)
Fits inside bolt circle and alignswith raised-face flanges. Very common in ANSI RF piping.
Type D (RTJ)
Designed for ring-type-joint flanges in high-pressure oilfield service.

Typical materials

Material	Advantages	Typical Use
G10/G11 GlassEpoxy	Excellent dielectric strength	Pipelines & CP systems
Phenolic	Economical	Water & utility service
PTFE	Chemical resistance	Chemical plants
Neoprene-faced Phenolic	Better sealing	Water/oil systems