Pure Expanded Graphite Gasket
Model:KXT 700
> Pure Expanded Graphite Gasket > Standard grade: 98% pure exfoliated graphite.> Widest temperature range.> Very easy to cut, although large gaskets may need support carriage and fitting.
Pure Expanded Graphite Gasket – KXT 700
Kaxite Sealing, a leading China expanded graphite gasket manufacturer, presents the KXT 700 Pure Expanded Graphite Gasket – a high-performance sealing solution engineered for demanding applications where exceptional temperature resistance, chemical inertness, and reliable sealing performance are critical. Pure expanded graphite gaskets are manufactured from high-purity exfoliated graphite (≥98% carbon content), offering outstanding thermal stability, self-lubricating properties, and excellent resistance to a wide range of aggressive chemicals.
Why KXT 700? Pure expanded graphite gaskets provide superior sealing performance across an extremely wide temperature range, from cryogenic conditions to high-temperature applications up to +450°C in oxidizing environments (and up to +3000°C in inert atmospheres). The material's inherent flexibility, resilience, and self-lubricating properties make it ideal for sealing pipes, valves, pumps, pressure vessels, heat exchangers, and condensers where conventional gasket materials would fail due to temperature extremes or chemical attack.
As a trusted expanded graphite gasket supplier in China, Kaxite offers the KXT 700 in a wide range of standard sizes and thicknesses, with custom dimensions and complex shapes available on request. Pure expanded graphite gaskets are easy to cut and install, making them ideal for both maintenance and OEM applications. Request a free sample or get a wholesale quote today.
Temp. Range (Oxidizing)-240°C to +450°C
Temp. Range (Inert)Up to +3000°C
Purity≥ 98% Carbon
Density~1.0 g/cm³
Compressibility≥ 40%
ComplianceISO 9001, REACH, RoHS
Why KXT 700 Pure Expanded Graphite Gasket?
- ✅ Extreme Temperature Resistance – From -240°C to +450°C (oxidizing) and up to +3000°C (inert)
- ✅ Excellent Chemical Resistance – Inert to virtually all chemicals except strong oxidizers
- ✅ Self-Lubricating – Low friction coefficient prevents flange galling and eases disassembly
- ✅ Excellent Sealability – Compressibility ≥40% ensures superior sealing on irregular flanges
- ✅ Non-Brittle & Flexible – Easy to cut and install, even for large or complex shapes
- ✅ Custom Shapes & Sizes – Available in any dimension or complex profile
Available Configurations – Pure & Reinforced Graphite Gaskets
Kaxite offers pure expanded graphite gaskets in multiple configurations to suit diverse application requirements. All gaskets are manufactured from high-purity expanded graphite with full material traceability.
Pure Expanded Graphite Gaskets
Manufactured from 98%+ pure exfoliated graphite, die-cut or waterjet-cut from flexible graphite sheets. These gaskets offer the widest temperature range and excellent chemical resistance. Ideal for high-temperature flanges, heat exchangers, and pressure vessels where contamination from fillers or binders is unacceptable. Very easy to cut, although large gaskets may require support carriage during handling.
Metal Reinforced Graphite Gaskets
For applications requiring higher mechanical strength and resistance to blowout, we offer graphite gaskets reinforced with tanged metal mesh (typically 316L stainless steel or 304 stainless steel). This construction provides enhanced tensile strength while maintaining the excellent sealing characteristics of expanded graphite. Ideal for high-pressure and high-temperature applications.
Custom Shapes & Complex Profiles
Beyond standard circular gaskets, we offer custom-designed graphite gaskets in rectangular, square, oval, and complex profiles – including gaskets with bolt hole flanges, water level gaskets, and custom die-cut shapes for specialized equipment. We work from your CAD drawings or physical samples to deliver the exact shape required.
* All configurations can be supplied with custom dimensions, thicknesses, and optional metal reinforcement. Contact us for specific application recommendations.
ISO 9001:2015 ≥ 98% Carbon Purity REACH & RoHS Compliant High Temperature Certified Custom Sizes & Shapes
Key Advantages of KXT 700 Pure Expanded Graphite Gasket
Exceptional Temperature Resistance – Withstands extreme temperatures from -240°C to +450°C in oxidizing environments and up to +3000°C in inert atmospheres, outperforming most other gasket materials.
Superior Chemical Inertness – Expanded graphite is chemically inert to virtually all media except strong oxidizers, making it ideal for aggressive chemical service.
Excellent Sealability – High compressibility (≥40%) and resilience ensure a reliable seal even on damaged or irregular flange surfaces.
Self-Lubricating Properties – Low coefficient of friction prevents flange galling and simplifies disassembly during maintenance operations.
Easy Installation – Flexible graphite is easy to cut and handle, even for large-diameter or complex-shaped gaskets, reducing installation time and labor costs.
Low Creep Relaxation – Maintains sealing force over time, reducing the need for frequent retightening and ensuring long-term reliability.
Pure Expanded Graphite – Material Properties & Technical Data
Expanded graphite is manufactured from natural graphite flakes that have been chemically treated and thermally exfoliated to produce a flexible, compressible material with exceptional sealing properties. Kaxite uses high-purity graphite (≥98% carbon) to ensure consistent performance. The table below lists typical values for our standard KXT 700 pure expanded graphite gasket material.
| Property | Typical Value | Test Method |
|---|---|---|
| Carbon Content | ≥ 98% | — |
| Density (g/cm³) | ~1.0 (customizable 0.7–1.5) | ASTM D792 |
| Compressibility (%) | ≥ 40 | ASTM F36 |
| Recovery (%) | ≥ 10 | ASTM F36 |
| Tensile Strength (MPa) | ≥ 4.0 | ASTM F152 |
| Temperature Range (Oxidizing) | -240°C to +450°C | — |
| Temperature Range (Inert) | Up to +3000°C | — |
| Leachable Chlorides (ppm) | ≤ 50 | — |
| pH Range | 0–14 (except strong oxidizers) | — |
* Custom density grades (0.7–1.5 g/cm³), metal-reinforced options, and low-chloride grades (for nuclear/stainless steel applications) are available upon request. Contact our technical team for material selection guidance.
Pure Expanded Graphite vs Other Gasket Materials – Quick Comparison
| Property | Expanded Graphite | PTFE (Teflon™) | Flexible Graphite | Non-Asbestos |
|---|---|---|---|---|
| Max Temp. (Oxidizing) | 450°C | 260°C | 450°C | 250°C |
| Min Temp. (°C) | -240 | -200 | -240 | -40 |
| Chemical Resistance | Excellent | Excellent | Excellent | Good |
| Compressibility | Excellent | Good | Excellent | Moderate |
| Self-Lubricating | Yes | Yes | Yes | No |
| Creep Relaxation | Low | High | Low | Moderate |
| Cost | Moderate | Moderate | Low | Low |
* Pure expanded graphite offers the widest temperature range and excellent chemical resistance, making it the superior choice for high-temperature and cryogenic applications where other materials would fail.
Typical Applications & Industries
Flange Sealing Pipe flange connections in high-temperature, high-pressure, and chemical service applications requiring reliable sealing performance.
Chemical Manufacturing Reactor seals, distillation column flanges, and process equipment seals in aggressive chemical environments.
Valves & Pumps Body seals, bonnet gaskets, and flange seals for pumps, valves, and other fluid handling equipment.
Pressure Vessels Manhole gaskets, handhole gaskets, and cover seals for pressure vessels and storage tanks.
Heat Exchangers Flange seals for shell-and-tube heat exchangers, plate heat exchangers, and condenser units.
Oil & Gas / Power Generation High-temperature flanges, boiler seals, turbine casing seals, and refinery equipment requiring extreme temperature resistance.
Why Choose Kaxite for Pure Expanded Graphite Gaskets?
Graphite Processing Expertise – With decades of experience in expanded graphite manufacturing, Kaxite ensures consistent quality, accurate dimensions, and defect-free surfaces.
ISO 9001:2015 Certified – Our manufacturing processes are fully certified, with strict quality controls from raw material to finished product.
Custom Engineering Capability – We manufacture expanded graphite gaskets to any dimension, thickness, and shape – standard or custom.
Competitive Factory-Direct Pricing – As a China expanded graphite gasket manufacturer, we supply directly to end-users and distributors, offering significant cost advantages.
Rapid Quote & Technical Support – Our engineering team provides fast turnarounds on custom designs and material recommendations – with a response time of under 2 business hours.
Global Supply Chain – We ship to over 40 countries, with flexible packaging and shipping options to meet your project deadlines.
Proven Reliability: Kaxite pure expanded graphite gaskets are specified by leading chemical, oil & gas, and power generation companies worldwide for their exceptional performance in extreme-temperature and chemical service applications.
Quality Assurance & Regulatory Compliance
Kaxite Sealing is an ISO 9001:2015 certified manufacturer. Our pure expanded graphite gaskets are produced under strict process controls – from graphite flake selection, chemical treatment, thermal exfoliation, sheet calendering, to die-cutting and final inspection. Each gasket is inspected for dimensional accuracy, density, thickness, and surface quality. We provide material test certificates (MTCs) and can supply chloride content analysis upon request, ensuring full traceability from raw material to finished product.
- ISO 9001:2015
- ≥ 98% Carbon Purity
- REACH & RoHS Compliant
- Low Chloride Content (≤50 ppm)
- 100% Dimensional Inspection
- Full Material Traceability
Quality you can depend on – our graphite gaskets are trusted by maintenance engineers and plant managers in critical service applications worldwide.
Custom Manufacturing & OEM Services – Free Sample Available
As a professional expanded graphite gasket manufacturer in China, we offer complete customisation to meet your exact specifications. Request a free sample or get a bulk quote today:
- Custom sizes for any flange standard (ANSI, ASME, DIN, JIS, BS)
- Custom shapes: round, rectangular, square, oval, or complex profiles
- Density grades: 0.7–1.5 g/cm³
- Metal reinforcement options: 304/316L stainless steel mesh
- Low-chloride grades for nuclear/stainless steel applications
- Private label packaging for distributors
- Just-in-time delivery and inventory management
Get a free sample or request a tailored bulk quote – our team responds within 24 hours with competitive factory pricing and lead‑time estimates.
Frequently Asked Questions About Pure Expanded Graphite Gaskets
- Q: What is expanded graphite and how is it manufactured?
- A: Expanded graphite is produced from natural graphite flakes that are chemically treated with strong acids (intercalation) and then rapidly heated to high temperatures (thermal exfoliation). This process expands the graphite flakes like an accordion, creating a flexible, compressible material that can be calendered into sheets and die-cut into gaskets. The resulting material retains graphite's exceptional chemical resistance and thermal stability while gaining flexibility and sealing capability.
- Q: What is the maximum temperature for pure expanded graphite gaskets?
- A: Pure expanded graphite gaskets can withstand continuous service from -240°C to +450°C in oxidizing environments (air) and up to +3000°C in inert atmospheres. This makes them the material of choice for both cryogenic and extreme high-temperature applications.
- Q: What chemicals should be avoided with expanded graphite?
- A: Expanded graphite is chemically inert to virtually all media except strong oxidizers such as concentrated nitric acid, chromic acid, and halogens (chlorine, fluorine) at high temperatures. It also has limited resistance to strong oxidizing agents and certain molten metals. For most chemical service applications, expanded graphite offers excellent compatibility across pH 0–14.
- Q: What is the difference between pure and metal-reinforced graphite gaskets?
- A: Pure graphite gaskets are made from 100% expanded graphite sheet with no reinforcement, offering maximum flexibility and conformability to flange surfaces. Metal-reinforced graphite gaskets incorporate a tanged metal mesh (typically 316L stainless steel) embedded in the graphite core, providing higher tensile strength, improved blowout resistance, and enhanced mechanical integrity for high-pressure applications.
- Q: What sizes and thicknesses can you manufacture?
- A: We can manufacture expanded graphite gaskets to any standard or custom dimension – both inch and metric. Typical thicknesses range from 0.5 mm to 6.0 mm, with custom thicknesses available upon request. Contact us with your drawing or specification for a custom quote.
Partner with Kaxite Sealing – your trusted pure expanded graphite gasket manufacturer and supplier in China. With decades of graphite processing expertise, advanced fabrication capabilities, and a steadfast commitment to quality, we deliver sealing solutions that perform reliably in the most demanding high-temperature, cryogenic, and chemical service applications. Request a free sample or get a tailored bulk quote today – our engineers respond within 24 hours.
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