Durable Expanded Graphite Gaskets for High-Temperature Sealing in China
What Are Expanded Graphite Gaskets?
High-performance sealing is a cornerstone of industrial reliability. At the forefront of this technology are expanded graphite gaskets, a premium sealing solution engineered for extreme conditions. Unlike traditional materials, expanded graphite is manufactured by exfoliating natural graphite flakes, resulting in a pure, flexible, and highly resilient material. This process creates a gasket with exceptional thermal conductivity, outstanding chemical resistance, and the ability to maintain a reliable seal under fluctuating pressures and temperatures. Kaxite Sealing specializes in manufacturing these advanced gaskets, providing industries with a sealing component that minimizes downtime and maximizes operational safety.
Key Advantages of Our Expanded Graphite Gaskets
The superiority of Kaxite Sealing's expanded graphite gaskets lies in their unique material properties, which translate into tangible benefits for your operations.
- Exceptional Temperature Resistance: Capable of performing continuously from cryogenic temperatures up to 3000°F (1650°C) in non-oxidizing atmospheres, and up to 900°F (482°C) in oxidizing environments.
- Superior Chemical Inertness: Highly resistant to a vast array of chemicals, acids, alkalis, and solvents, making them ideal for aggressive process media.
- Excellent Sealability & Low Creep Relaxation: The material's conformability ensures a tight seal on imperfect flanges with low bolting stress, and it exhibits minimal creep, maintaining seal integrity over long periods.
- Thermal & Electrical Conductivity: Provides excellent heat dissipation and can be used for electrical grounding applications across joints.
- Flexibility & Compressibility: Easy to cut, shape, and install, even on complex flange geometries, without cracking or crumbling.
Technical Specifications & Product Parameters
Understanding the precise specifications of a gasket is critical for proper selection. Below are the detailed parameters for Kaxite Sealing's standard expanded graphite gasket material.
| Property | Test Standard | Typical Value | Unit |
|---|---|---|---|
| Density | ASTM F 1315 | 1.0 - 1.1 | g/cm³ |
| Tensile Strength | ASTM F 152 | ≥ 4.5 | MPa |
| Compressibility | ASTM F 36 | 40 - 60 | % |
| Recovery | ASTM F 36 | ≥ 15 | % |
| Creep Relaxation | ASTM F 38 | ≤ 25 | % |
| Thermal Conductivity | ASTM E 1461 | ≥ 150 (W/m·K) | W/m·K |
| pH Value | ASTM E 70 | 5 - 7 | - |
| Chloride Content | ASTM F 155 | ≤ 50 | ppm |
| Temperature Range (Oxidizing) | - | -400°F to +900°F | °F / °C |
| Temperature Range (Non-Oxidizing) | - | Up to 3000°F | °F / °C |
Available Styles and Configurations from Kaxite Sealing
We offer a comprehensive range of styles to meet diverse application needs:
- Plain Sheets: For custom cutting and fabrication on-site or for use as sheet packing.
- Die-Cut Gaskets: Precision-cut to specific flange dimensions, including complex shapes with bolt holes.
- Corrugated or Embossed: Enhanced seating and sealing performance for specific flange types.
- Laminated & Reinforced: Combined with stainless steel inserts, tanged metal, or perforated cores for added mechanical strength and handling stability in high-pressure applications.
- Spiral Wound Gasket Filler: Used as the filler material in high-performance spiral wound gaskets for extreme service.
Industries and Applications
Kaxite Sealing's expanded graphite gaskets are the sealing material of choice across a wide spectrum of demanding industries due to their versatility and reliability.
- Chemical & Petrochemical Processing: Reactors, heat exchangers, pumps, and valves handling corrosive acids, alkalis, and hydrocarbons.
- Power Generation: Flange connections in boilers, turbines, and heat recovery steam generators (HRSGs), especially in high-temperature steam service.
- Oil & Gas (Upstream & Refining): Wellhead equipment, refinery piping, and offshore platforms where fire safety and chemical resistance are paramount.
- Pharmaceutical & Food Processing: Sanitary applications requiring a clean, non-contaminating, and FDA-compliant seal.
- Automotive & Aerospace: Exhaust systems, fuel cells, and high-temperature engine components.
- General Industrial Manufacturing: Furnace doors, thermal oxidizers, and any high-temperature heating equipment.
Frequently Asked Questions (FAQs) About Expanded Graphite Gaskets
Q: What is the primary difference between expanded graphite and compressed asbestos sheet (CAS) gaskets?
A: While both are flexible sheet materials, expanded graphite is a modern, high-performance material free from asbestos. It offers significantly better thermal conductivity, higher temperature resistance in inert atmospheres, and superior chemical resistance to many media. It is also more compressible, requiring lower bolt load to achieve an effective seal, making it a safer and more efficient upgrade from traditional asbestos-based materials.
Q: Can Kaxite Sealing expanded graphite gaskets be used for flanges with low bolt load?
A: Yes, absolutely. One of the key advantages of our expanded graphite material is its excellent compressibility and sealability under low seating stress. It conforms easily to surface imperfections, creating an effective seal even when full, high bolt loads cannot be applied. This makes it ideal for fragile equipment like glass-lined reactors or aged piping systems.
Q: How do I handle and store expanded graphite gasket sheets?
A: Proper handling ensures optimal performance. Store sheets and gaskets in a cool, dry place away from direct sunlight and moisture. Keep them in their original packaging until use. While expanded graphite is robust, avoid excessive bending or folding which could cause creasing. Always wear clean gloves when handling to prevent oil and dirt contamination from skin.
Q: Are there any media or service conditions where expanded graphite is not recommended?
A: While highly chemically resistant, expanded graphite is not recommended for prolonged use with strong oxidizing agents (e.g., hot concentrated nitric acid, sulfuric acid above 98%) or in high-temperature, highly oxidizing atmospheres without proper testing. Its performance in such conditions can degrade. For these specific services, Kaxite Sealing engineers can recommend alternative materials or test the compatibility for your application.
Q: Can you supply expanded graphite gaskets with anti-stick coatings or special facings?
A: Yes, Kaxite Sealing offers various enhancements. A common option is an anti-stick coating (often PTFE-based) on one or both sides. This coating prevents the gasket from adhering to the flange faces during disassembly, making maintenance faster and reducing the risk of damage. We also supply gaskets laminated with metal foils or other facings for specific sealing or handling requirements.
Q: How do I determine the correct thickness and style of expanded graphite gasket for my application?
A: Selection depends on several factors: flange type (flat face, raised face), surface condition, pressure, temperature, and the media being sealed. As a general guide, 1/16" (1.5mm) is common for standard raised face flanges. For uneven surfaces, a thicker gasket (1/8" or 3mm) may be needed. For high-pressure applications, a reinforced or laminated style is advisable. The Kaxite Sealing technical team is always available to review your application data and provide a precise recommendation.
Q: What quality certifications does Kaxite Sealing hold for its expanded graphite products?
A: Kaxite Sealing is committed to quality and reliability. Our manufacturing processes and materials comply with international standards such as ASTM, ASME, and DIN. We can provide material test reports (MTRs) for traceability. Our products are also tested to meet critical industry specifications for low chloride and sulfur content, which is essential for avoiding stress corrosion cracking (SCC) in stainless steel systems, particularly in power and chemical industries.
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