ISO 9001 certified manufacturer in China. PTFE, Gylon, phenolic and PEEK kits for cathodic protection and stray current isolation.
Kaxite Sealing is an ISO 9001 certified flange insulation gasket kits manufacturer and wholesale supplier in China. For over two decades, we have engineered electrical isolation sealing solutions for oil & gas, chemical processing, power generation and offshore industries. Our product range covers flange insulation gasket sets, Type D flange insulation gaskets, neoprene faced phenolic gaskets and Seinseal insulation gasket kits.
In complex industrial piping and structural systems, controlling electrical current flow is as critical as containing fluid or gas pressure. Stray electrical currents, often from cathodic protection systems or telluric currents, can cause accelerated corrosion through a process known as galvanic corrosion. This is where a meticulously engineered flange insulation gasket kit becomes an indispensable component for system integrity, safety and longevity.
Unlike a standard gasket, a complete insulation kit provides a comprehensive dielectric barrier, protecting both the flange faces and the bolting from becoming a pathway for corrosion. A standard kit from Kaxite Sealing is more than just an insulating gasket; it is a complete system designed for straightforward installation and optimal performance.
| Component | Standard Material | High-Performance Options | Key Property |
|---|---|---|---|
| Insulating Gasket | Virgin PTFE | Filled PTFE, Modified PTFE, PEEK, Gylon | Dielectric Strength, Chemical Resistance |
| Sleeves & Washers | PTFE, Phenolic Resin | PPS, PEI, Ceramic-Filled Polymers | Compressive Strength, Heat Resistance |
| Steel Washers | Carbon Steel (coated) | Stainless Steel 304 / 316 | Load Distribution, Corrosion Resistance |
| Parameter | Typical Range / Standard | Notes |
|---|---|---|
| Dielectric Strength | >5 kV/mm (PTFE core) | Measures electrical insulation capability. |
| Temperature Range | -100°F to +500°F (-73°C to +260°C) | Standard PTFE range. PEEK and filled PTFE extend upper limits. |
| Pressure Rating | Up to Class 1500 (API 6A) | Dependent on gasket design, material and flange facing. |
| Flange Standards | ANSI B16.5, ASME B16.47, API 6A, DIN, BS, JIS | Kits manufactured to match standard flange dimensions. |
| Nominal Pipe Size | 1/2" to 60" and larger | Standard sizes stocked; custom kits for special flanges. |
| Gasket Thickness | 1/16", 1/8", 3/16", 1/4" | Final choice depends on flange type and insulation requirements. |
Send your flange size, pressure class, service media and operating temperature. Our engineers select the correct material, thickness and kit components within 24 hours.
We provide a detailed quotation including unit price, MOQ, lead time and packaging options. Custom MOQ may vary by material and flange size.
We produce free samples of the gasket, sleeves and washers for your quality evaluation. Sample lead time is typically 5-7 working days.
After sample approval, we start mass production with full dielectric strength testing, dimensional inspection and batch traceability.
Custom logos, labels, poly bags, cartons and pallets. We support neutral packaging and private label for distributors and brands.
Worldwide shipping by sea, air and express. Full export documentation including invoice, packing list, CO, MTR, COC and third-party inspection reports.
Kaxite Sealing operates an ISO 9001 certified quality management system. Every kit component is inspected, and critical parameters like dielectric strength and dimensional accuracy are verified. Kits are designed to withstand not just electrical requirements but also the mechanical stress of bolt torque, thermal cycling and system pressure. Learn more about our company profile.
Our flange insulation kits are supplied to distributors, OEM brands and EPC contractors in 80+ countries across oil & gas, chemical and power industries. Every batch comes with mill test reports, dielectric strength test records and dimensional inspection reports.
— Kaxite Sealing Quality Assurance TeamA German pipeline EPC contractor ordered 3,500 sets of PTFE/phenolic insulation kits to ASME B16.5 Class 600. Batch MTRs and dielectric strength test reports were provided for each shipment.
A UAE industrial distributor placed recurring monthly orders of Gylon-based insulation kits for high-temperature service. Neutral packaging and private labeling were used.
A US wellhead OEM ordered API 6A 10,000 psi insulation kits with PEEK sleeves. Samples were approved within 7 days and mass production started immediately after.
Mill Test Report (MTR) · Material Certificate · Dielectric Strength Test Report · Dimensional Inspection Report · Certificate of Conformance (COC) · Third-Party Inspection (SGS / TÜV / BV on request) · Packing List & Commercial Invoice
A: The primary purpose is to electrically isolate two flanged pipe or equipment sections to prevent galvanic corrosion. The insulation kit breaks the electrical circuit, stopping current flow and halting the corrosion process. It also isolates pipelines from grounded structures and protects sensitive equipment from stray currents.
A: Our standard MOQ is 50 sets per flange size and pressure class for wholesale orders. For custom and OEM kits, MOQ may vary depending on material, dimensions and packaging requirements. Free samples are available for quality evaluation before bulk purchase.
A: Standard lead time is 7-15 working days for most flange insulation gasket kit products. Custom and OEM orders may require 15-25 working days depending on specifications and order quantity. Rush orders can be accommodated upon request.
A: No. This is a common and critical mistake. The insulating gasket alone only isolates the flange faces. The stud bolts or nuts, which are metallic, will still create a direct electrical connection between the two flanges. The full kit with sleeves, washers and gasket is essential to create a complete dielectric barrier across the entire joint assembly.
A: Improper installation can lead to immediate or premature failure. Consequences include electrical short-circuiting allowing corrosion to proceed, physical damage such as cracking or crushing of insulating components leading to leaks, inadequate bolt load resulting in flange leakage, and increased maintenance costs. Always follow the manufacturer installation guide meticulously.
A: Material selection depends on service conditions. Consider chemical compatibility first, the gasket material must resist the process fluid. Then temperature, the material must maintain insulating and sealing properties at operating temperature. Then pressure, the gasket design and material must withstand internal pressure. Finally standards and specifications, some industries have specific material approvals.
A: Yes. Standard PTFE kits are excellent for a wide range of applications. For high temperatures beyond 260°C we can supply kits with PEEK gaskets and high-temperature polymer or ceramic-based sleeves. For high-pressure applications we engineer kits with robust compressed fiber or metal-core gaskets with insulating layers, designed to meet API and ASME standards.
A: The standard field test is a continuity or resistance check using a multimeter. Before system commissioning, test for electrical isolation by measuring the resistance across the insulated flange. Place one probe on one flange and the other probe on the opposite flange. A properly installed kit will show very high resistance, typically in the megaohm range or an open circuit reading, confirming electrical isolation.
Tell us your flange size, pressure class and service media, and our engineers will respond within 24 hours with a competitive quotation and free sample offer.
Send Inquiry Now Download Catalogue
