Flange Insulation Gasket Kits – complete pre-assembled solutions engineered to provide reliable electrical isolation and corrosion protection for flanged pipeline connections. Each kit includes a precision-machined insulating gasket (Type E, F, or D) plus insulating sleeves and washers, ensuring ready-to-install cathodic protection for oil, gas, petrochemical, and water treatment systems. As a leading China flange insulation gasket kit manufacturer, Kaxite offers multiple material options – phenolic, neoprene-faced phenolic, silicone glass (G-7), and epoxy glass (G-10/G-11) – to meet the most demanding operating conditions. All kits are manufactured to ASME B16.5, B16.47, and API 6A standards with full material traceability and test reports.
Flange Insulation Gasket Kits are comprehensive isolation solutions designed to prevent galvanic corrosion, control stray electric currents, and enhance the effectiveness of cathodic protection systems in pipeline networks. Each kit consists of a dielectric gasket – available in Type E (Full Face), Type F (Ring), or Type D (RTJ) configurations – along with insulating sleeves and washers that electrically isolate the flange bolts from the pipe flanges. This complete assembly ensures that the entire flange joint is protected from electrolytic corrosion, extending asset life and reducing maintenance costs. As a trusted China flange insulation gasket kit supplier, Kaxite manufactures these kits to ASME B16.5, ASME B16.47, and API 6A standards, with sizes ranging from ½" to 24" and pressure classes from 150# to 2500#.
The gasket itself is crafted from high-performance composite materials including plain phenolic, neoprene-faced phenolic, silicone glass (G-7), and 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 extensively used in oil and gas pipelines, refineries, chemical plants, water treatment facilities, and offshore platforms to protect infrastructure and ensure operational safety.
Dielectric strength up to 550 V/mil – effectively breaks stray current paths and prevents galvanic corrosion.
Includes gasket, sleeves, and washers – eliminates the need for multiple suppliers and simplifies procurement.
Type E (Full Face), Type F (Ring), Type D (RTJ) – covers all common flange designs and standards.
Phenolic, neoprene-faced, G-7, G-10, G-11 – select based on temperature, pressure, and media.
Material test reports (MTRs) and inspection certificates provided with every shipment.
Lead times as short as 7 days; sea, air, or express shipping with full export documentation.
Covers the entire flange face with precision-cut bolt holes. Provides maximum cathodic isolation and prevents collection of foreign matter between flange faces. Ideal for standard flat-face flanges and harsh environments.
Designed to fit the raised face portion of flanges only. The outside diameter is slightly smaller than the bolt circle, facilitating centering. Recommended with flange wrapping to prevent bridging.
Precision-machined to fit the ring grooves of ring-type joint (RTJ) flanges. Manufactured to ASME B16.5 and API 6A standards for high-pressure, high-temperature applications.
| 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. Always verify combined material temperature limits for your specific application.
Proper installation ensures optimal performance of your Flange Insulation Gasket Kits:
For detailed torque specifications, consult our installation guide or contact our engineering team.
As an ISO 9001:2015 certified China flange insulation gasket kit manufacturer, Kaxite maintains stringent quality control:
Case Example: Offshore Pipeline Cathodic Protection
A major offshore operator in the North Sea was experiencing accelerated corrosion at subsea flange connections due to failed electrical isolation. Kaxite supplied Flange Insulation Gasket Kits in Type E (Full Face) configuration with G-10 epoxy glass retainers and PTFE sleeves for 12" 900# flanges. The complete kit solution simplified installation and provided dielectric strength exceeding 550 V/mil. After 30 months of service, inspection confirmed zero corrosion and full isolation integrity, resulting in estimated savings of $250,000 in maintenance and avoided downtime.
For individual gaskets without sleeves/washers, explore our Neoprene Faced Phenolic Gaskets, Type D Gaskets, and Flange Insulation Gasket Sets.
As a leading China flange insulation gasket kit supplier, Kaxite delivers comprehensive solutions with exceptional value:
Kaxite makes it easy to source flange insulation gasket kits wholesale with clear and flexible terms:
Need Flange Insulation Gasket Kits for your project? Send your inquiry and our team will respond within 24 hours with pricing and availability.
★ China's Trusted Flange Insulation Gasket Kits 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
