Flange Insulation Gasket Sets – complete pre-assembled kits designed to provide reliable electrical isolation and corrosion protection for flanged pipeline connections. Each set includes a precision-engineered gasket (Type E, F, or D) plus insulating sleeves and washers, ensuring a ready-to-install solution for cathodic protection systems. As a leading China flange insulation gasket manufacturer, Kaxite supplies these kits in multiple materials – phenolic, neoprene-faced, silicone glass (G-7), and epoxy glass (G-10/G-11) – to meet the most demanding oil, gas, petrochemical, and water treatment applications. All kits are manufactured to ASME B16.5, B16.47, and API 6A standards, with full material traceability and test reports.
A Flange Insulation Gasket Set is a complete isolation solution that includes a dielectric gasket along with insulating sleeves and washers to electrically isolate the flange bolts from the pipe flanges. These sets are critical for preventing galvanic corrosion, controlling stray electric currents, and ensuring the effectiveness of cathodic protection systems in pipelines. Kaxite's kits are available in three primary configurations – Type E (Full Face) for complete flange coverage, Type F (Ring) for raised face flanges, and Type D (RTJ) for ring-type joint flanges – each tailored to specific flange designs and operating conditions. As a trusted China flange insulation gasket set supplier, we provide custom sizes, material choices, and fast turnaround for projects worldwide.
The gasket itself is manufactured from high-performance composites such as phenolic, neoprene-faced phenolic, silicone glass (G-7), or epoxy glass (G-10/G-11), offering dielectric strengths from 350 to 550 Volts/mil and insulation resistance up to 200,000 Meg Ohms. The included sleeves and washers are precision-molded from the same insulating materials to prevent bolt-to-flange contact, maintaining complete isolation even under high bolt loads. These kits are widely used in oil and gas pipelines, refineries, chemical plants, and water treatment facilities to extend asset life and reduce maintenance costs.
Includes gasket, sleeves, and washers – no additional sourcing required.
Type E (Full Face), Type F (Ring), Type D (RTJ) – covers all common flange designs.
Up to 550 V/mil, 50,000 psi compressive – reliable isolation under extreme conditions.
Phenolic, neoprene-faced, G-7, G-10, G-11 – select based on temperature and media.
From ½" to 24", Class 150 to 2500 – we match your flange specifications.
Material test reports (MTRs) and inspection certificates included with every kit.
| Property | Plain Phenolic | Neoprene-Faced Phenolic | Silicone Glass G-7 | Epoxy Glass G-10 | Epoxy Glass G-11 |
|---|---|---|---|---|---|
| Dielectric (V/mil) | 500 | 500 | 350-400 | 550 | 550 |
| Compressive (psi) | 25,000 | 25,000 | 40,000 | 50,000 | 50,000+ |
| Water Absorption (%) | 1.6 | 1.6 | 0.07 | 0.10 | 0.10 |
| Insulation Resistance (Meg Ohms) | 40,000 | 40,000 | 2,500 | 200,000 | 200,000 |
| Flexural (psi) | 22,500 | 22,500 | 27,000 | 45,000 | 43,000 |
| Temp Range (°C) | -54 to +104 | -54 to +79 | -180 to +232 | -180 to +138 | -180 to +177 |
* G-7 material is not recommended for hydrocarbon service. Consult Kaxite engineering for material selection.
Covers entire flange face – prevents debris accumulation, maximum cathodic isolation. Ideal for standard flat-face flanges.
Fits raised face flanges – O.D. slightly less than bolt circle. Recommended with flange wrapping for complete isolation.
Precision-machined for ring-type joint flanges – meets ASME B16.5 and API 6A requirements.
For detailed dimensions and pressure ratings, refer to our complete kit catalog or contact our sales team for custom configurations.
As an ISO 9001:2015 certified China flange insulation gasket set manufacturer, Kaxite implements strict quality controls from material sourcing to final packing:
Case Example: Major Refinery Cathodic Protection Upgrade
A large petrochemical refinery in Texas was experiencing severe corrosion at flange connections due to inadequate electrical isolation, causing frequent shutdowns. Kaxite supplied Flange Insulation Gasket Sets in Type E (Full Face) configuration using G-10 epoxy glass material for 600# flanges. The kits included insulating sleeves and washers, allowing quick installation without additional parts. After 18 months of service, inspections confirmed zero corrosion and full isolation integrity, reducing maintenance costs by an estimated $150,000 annually and eliminating unplanned downtime.
For individual gaskets without sleeves/washers, explore our Neoprene Faced Phenolic Gaskets and Type D Flange Insulation Gasket.
As a leading China flange insulation gasket sets manufacturer, Kaxite delivers comprehensive isolation solutions with exceptional value:
Kaxite makes it easy to source flange insulation gasket sets wholesale with clear and flexible terms:
Need Flange Insulation Gasket Sets for your project? Send your inquiry and our team will respond within 24 hours with pricing and availability.
★ China's Trusted Flange Insulation Gasket Sets Manufacturer – Request Your Quote
Contact Kaxite for factory-direct wholesale pricing, custom kits, and expert technical support.
Address
No 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China
