Type D Flange Insulation Gasket – precision-engineered for RTJ (ring-type joint) flanges, providing superior electrical isolation and sealing integrity in critical pipeline systems. Manufactured from high-grade phenolic, epoxy glass, or silicone glass materials, these gaskets meet ASME B16.5 and API 6A requirements. As a leading China flange insulation gasket supplier, Kaxite delivers Type D gaskets with full material traceability, custom dimensions, and fast global delivery.
A Type D Flange Insulation Gasket is a specialized sealing component designed exclusively for RTJ (ring-type joint) flanges. Unlike flat-faced gaskets, Type D gaskets feature a precision-machined profile that matches the ring groove geometry, ensuring a leak-tight seal while providing complete electrical isolation between flange faces. These gaskets are manufactured from high-strength composite materials such as phenolic, epoxy glass (G-10/G-11), or silicone glass (G-7), each offering distinct performance characteristics for temperature, pressure, and chemical resistance. As a premier China Type D gasket manufacturer, Kaxite produces these gaskets to ASME B16.5, ASME B16.47, and API 6A specifications, with sizes ranging from 1/2" to 24" and pressure classes up to 2500#.
The Type D design is preferred in high-pressure, high-temperature, and corrosive environments where standard flat gaskets may fail. The ring-groove engagement provides superior resistance to blowout and maintains bolt load over thermal cycling. Electrical isolation is critical in cathodic protection systems, and Type D gaskets offer dielectric strength exceeding 500 Volts/mil and insulation resistance up to 200,000 Meg Ohms, effectively breaking stray current paths and preventing galvanic corrosion.
Note: G-7 material should not be used with hydrocarbons, even trace amounts. Consult Kaxite engineering for material selection guidance.
| Property | Plain Phenolic | Silicone Glass G-7 | Epoxy Glass G-10 | Epoxy Glass G-11 |
|---|---|---|---|---|
| Dielectric Strength (V/mil) | 500 | 350-400 | 550 | 550 |
| Compressive Strength (psi) | 25,000 | 40,000 | 50,000 | 50,000+ |
| Water Absorption (%) | 1.6 | 0.07 | 0.10 | 0.10 |
| Insulation Resistance (Meg Ohms) | 40,000 | 2,500 | 200,000 | 200,000 |
| Flexural Strength (psi) | 22,500 | 27,000 | 45,000 | 43,000 |
| Operating Temp (°F) | -65 to +220 | -292 to +450 | -292 to +280 | -292 to +350 |
| Operating Temp (°C) | -54 to +104 | -180 to +232 | -180 to +138 | -180 to +177 |
As an ISO 9001:2015 certified China Type D flange insulation gasket manufacturer, Kaxite implements stringent quality controls:
Case Example: Offshore Platform Cathodic Protection
An offshore oil platform in the Gulf of Mexico experienced accelerated corrosion on subsea piping due to inadequate electrical isolation. Kaxite supplied Type D Flange Insulation Gaskets in G-10 material for 18" 900# RTJ flanges. The installation provided dielectric strength >550 V/mil and insulation resistance exceeding 100,000 Meg Ohms, effectively breaking stray current paths. After 24 months, inspection revealed zero corrosion and no gasket degradation, resulting in estimated savings of $200,000 in maintenance and downtime.
For other flange types, explore our Neoprene Faced Phenolic Gaskets and Flange Insulation Gasket Kits.
As a leading China flange insulation gasket factory, Kaxite combines 25+ years of manufacturing experience with a commitment to quality and customer service. We offer:
Kaxite provides seamless procurement of flange insulation gaskets wholesale with clear and transparent processes:
Need Type D Flange Insulation Gaskets for your next project? Send your inquiry and our team will respond within 24 hours with pricing and availability.
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