Kaxite Sealing is an ISO 9001 certified double jacket gaskets manufacturer and wholesale supplier in China. For over 10 years, we have engineered high-integrity sealing solutions for oil & gas, petrochemical, power generation, chemical processing and heat exchanger applications. Our product range covers stamping jacket gaskets and double jacket gaskets, along with related spiral wound gaskets, Kammprofile gaskets and ring joint gaskets.
In demanding industrial sealing applications where standard gaskets fail, double jacket gaskets provide a robust and reliable solution. Engineered for superior performance in high-pressure and high-temperature environments, these gaskets feature a unique construction that combines metallic strength with sealing resilience. At Kaxite Sealing, we specialize in the design and manufacture of premium double jacket gaskets that meet the rigorous standards of the oil and gas, chemical processing, power generation, and petrochemical industries.
The core principle behind a double jacket gasket is its composite structure. It consists of a soft, compressible filler material—typically non-asbestos sheets like graphite, PTFE, or ceramic fiber—encased within two layers of formed metal jacket. This metal jacket, often made from stainless steel, carbon steel, or exotic alloys like Monel or Inconel, provides structural integrity and contains the filler material under extreme conditions. This design ensures excellent seating stress distribution, prevents blowouts, and offers exceptional resistance to creep relaxation, making them ideal for heat exchangers, pressure vessels, and flanged connections in critical service.
The dual metal jackets act as a reinforced armor, containing the filler and withstanding internal pressures exceeding 2,500 psi, depending on size and material.
With filler materials like flexible graphite, our gaskets can operate continuously at temperatures up to 900°F (482°C) in oxidizing atmospheres and even higher in inert services.
By selecting appropriate jacket and filler materials, we tailor gaskets to resist a vast array of corrosive media, from acids and alkalis to hydrocarbons.
The metal jackets limit the cold flow of the filler material, maintaining a high sealing force over long periods and numerous thermal cycles, reducing the need for frequent re-torquing.
The fully enclosed metal jacket design securely traps the filler, eliminating the risk of filler material being extruded into the process stream under high pressure or vacuum conditions.
Compared to many soft gaskets, our double jacket gaskets often maintain their seal integrity after disassembly, allowing for careful reuse in many applications, providing cost savings.
Kaxite Sealing offers a comprehensive range of double jacket gaskets. The specifications below are critical for ensuring proper selection and performance.
| Component | Material Options | Key Properties & Typical Applications |
|---|---|---|
| Metal Jacket | 304/316 Stainless Steel, Carbon Steel, Monel 400, Inconel 600/625, Hastelloy C276, Titanium, Copper | Provides strength and corrosion resistance. SS316 is common for general corrosion; exotic alloys are for severe chloride or acid services. |
| Filler Material | Flexible Graphite (Grafoil), PTFE, Ceramic Fiber, Mica, Non-Asbestos Compressed Fiber | Provides the primary seal. Graphite offers wide temp range and chemical inertness. PTFE is for aggressive chemicals at lower temps. |
| Jacket Thickness | 0.012" (0.3mm), 0.016" (0.4mm), 0.020" (0.5mm), 0.025" (0.63mm) | Thicker jackets offer higher pressure ratings and durability but require higher bolt load for proper seating. |
| Nominal Pipe Size (NPS) | Inside Diameter (ID) Range | Outside Diameter (OD) Range | Pressure Class (ANSI/ASME) | Max Temp (Graphite Filler) |
|---|---|---|---|---|
| 1/2" to 24" | 0.84" to 24.50" | 1.88" to 27.25" | 150, 300, 600, 900, 1500, 2500 | -240°F to +900°F (-150°C to +482°C) |
| 24" and larger (Custom) | Per customer flange drawing | Per customer flange drawing | Custom designs for special applications | Dependent on material combination |
| Parameter | Test Standard | Typical Value (SS316 Jacket / Graphite Filler) |
|---|---|---|
| Recommended Seating Stress | ASME PCC-1 | 20,000 - 30,000 psi |
| Blowout Pressure Resistance | API 6A / ASME B16.20 | > 1.5 x Rated Pressure Class |
| Leak Rate (Helium) | ASME B16.34 / ISO 15848 | < 1 x 10-6 mg/s·m |
| Compression-Recovery (%) | ASTM F36 | 15-25% compression with >85% recovery |
| Chemical Compatibility | N/A | Excellent with most acids, solvents, steam, and hydrocarbons |
Double jacket gaskets for wellhead equipment, high-pressure pipelines and refinery flanges.
Custom double jacket gaskets for shell-and-tube, plate and air-cooled heat exchangers.
Blowout-resistant gaskets for reactors, vessels and manway covers.
PTFE and graphite filled gaskets for aggressive acids, solvents and ultra-pure media.
High-temperature gaskets for steam turbines, boilers and power plant systems.
Corrosion-resistant gaskets for reactors, process piping and refinery service.
Kaxite Sealing supports full custom and OEM double jacket gasket manufacturing, from drawing review to sample approval and mass production. Our engineers work directly with your technical team to confirm dimensions, materials, tolerances and packaging.
Send your 2D/3D drawings, flange sketches or old gasket samples. Our engineers review material, dimensions, tolerance and standard compliance within 24 hours.
We provide a detailed quotation including unit price, MOQ, lead time and packaging options. Custom MOQ may vary by material and size.
We produce free samples for your quality evaluation. Sample lead time is typically 5-7 working days for standard materials.
After sample approval, we start mass production with full dimensional inspection, material certificates 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: invoice, packing list, CO, MTR, COC and third-party inspection reports.
Kaxite Sealing operates an ISO 9001 certified quality management system. Every double jacket gasket undergoes raw material verification, precision jacket forming, dimensional inspection and batch testing. We provide mill test reports, material certificates and third-party inspection reports upon request. Learn more about our company profile.
Our double jacket gaskets 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, material certificates and dimensional inspection records. Third-party inspection is available on request.
Custom dimensions, materials, jacket thicknesses, logos, labels and packaging. Send your drawings or samples and our engineers will confirm feasibility within 24 hours.
Kaxite Sealing supports distributors, OEM brands and EPC contractors worldwide. Below are typical cooperation cases and the inspection documents we provide for every bulk double jacket gasket order.
A German heat exchanger manufacturer ordered 6,000 pcs of SS316/graphite double jacket gaskets to ASME B16.20 with custom IDs. Batch MTRs and dimensional reports were provided for each shipment.
A UAE industrial distributor placed recurring monthly orders of Monel 400 jacketed gaskets for high-pressure service. Neutral packaging and private labeling were used.
A US EPC contractor ordered stamping jacket gaskets for high-temperature steam flanges. Samples were approved within 7 days and mass production started immediately after.
Mill Test Report (MTR) · Material Certificate · Dimensional Inspection Report · Certificate of Conformance (COC) · Third-Party Inspection (SGS / TÜV / BV on request) · Packing List & Commercial Invoice
Q: What is the MOQ for wholesale double jacket gaskets from Kaxite Sealing?
A: Our standard MOQ is 50 pieces per gasket type for wholesale orders. For custom and OEM double jacket gaskets, MOQ may vary depending on material, dimensions and packaging requirements. Free samples are available for quality evaluation before bulk purchase.
Q: How long is the lead time for bulk double jacket gasket orders?
A: Standard lead time is 7-15 working days for most double jacket gasket products. Custom and OEM orders may require 15-25 working days depending on specifications and order quantity. Rush orders can be accommodated upon request. We ship worldwide via sea, air and express couriers.
Q: When should I choose a double jacket gasket over a spiral wound gasket or a Kammprofile gasket?
A: The choice depends on service conditions. Double jacket gaskets are often preferred for applications with extreme pressure, high temperature cycling, or where blowout of filler material is a primary concern. They generally have a higher seating stress requirement but offer excellent creep resistance. Spiral wound gaskets are excellent for a wide range of pressures and temperatures and are more forgiving to flange surface imperfections. Kammprofile gaskets are ideal for heat exchanger applications and situations requiring high resilience and excellent performance under thermal cycling.
Q: How do I properly install and torque a double jacket gasket?
A: Correct installation is crucial. First, ensure flanges are clean, undamaged, and aligned. Place the gasket centered on the flange face. Use lubricated bolts and follow a star-pattern tightening sequence (cross-bolting) in multiple passes. The final pass should achieve the target bolt stress as calculated per ASME PCC-1 guidelines, typically corresponding to 20,000-30,000 psi gasket seating stress. Under-torquing can lead to leakage; over-torquing can crush the filler or damage the metal jacket.
Q: Can Kaxite Sealing provide double jacket gaskets for non-standard or special flange dimensions?
A: Absolutely. Customization is a core strength at Kaxite Sealing. We routinely manufacture double jacket gaskets for proprietary flanges, heat exchanger channels, and vessels with unusual dimensions. Simply provide us with an accurate flange sketch, CAD drawing, or a sample of the old gasket. We can engineer the gasket with custom IDs, ODs, thicknesses, and material combinations to fit your exact application.
Q: Are there any media or chemicals that double jacket gaskets are not suitable for?
A: While highly versatile, material compatibility is paramount. Standard graphite-filled gaskets are not recommended for strongly oxidizing acids (e.g., nitric, sulfuric at high concentrations) at elevated temperatures, as they can oxidize. PTFE filler has limitations with certain solvents and at high temperatures. For applications involving molten alkali metals, pure oxygen service, or other exotic media, a thorough review is necessary. Kaxite Sealing provides detailed chemical compatibility guides and engineering support.
Q: How does Kaxite Sealing ensure the quality of its double jacket gaskets?
A: Every Kaxite Sealing double jacket gasket is manufactured under a strict ISO 9001 quality management system. We perform dimensional inspections on all critical parameters (ID, OD, thickness) using calibrated instruments. Material certifications (MTC) are available for all metal and filler materials. For critical service applications, we can provide additional testing, such as helium leak tests or PMI (Positive Material Identification), to verify alloy composition.
Tell us your sealing requirements and our engineers will respond within 24 hours with a competitive quotation and free sample offer.
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