For engineers and procurement specialists seeking reliable thermal management and sealing solutions, the choice of material is critical. At the forefront of this field is the Graphite Sheet, a versatile and superior material engineered to solve complex challenges in extreme environments. Kaxite Sealing specializes in manufacturing premium-grade graphite sheets, combining advanced material science with rigorous quality control to deliver products that consistently exceed industry standards.
Our graphite sheets, often referred to as flexible graphite sheets, are manufactured from high-purity natural graphite. Through a meticulous process of chemical treatment and high-temperature expansion, we produce a material with exceptional properties: outstanding thermal conductivity, reliable sealing under high temperatures and pressures, and inherent resistance to corrosion. This makes Kaxite Sealing's graphite sheet an indispensable component across a wide spectrum of demanding industries.
The superiority of Kaxite Sealing's Graphite Sheet lies in its unique set of inherent material properties:
Kaxite Sealing offers a range of graphite sheet products tailored to specific application needs. Below are the standard specifications for our most popular grades.
| Property | Test Method | Unit | Standard Grade Value | High-Density Grade Value |
|---|---|---|---|---|
| Density | ASTM F1315 | g/cm³ | 1.0 - 1.1 | 1.5 - 1.6 |
| Tensile Strength (MD) | ASTM F152 | MPa | ≥ 4.5 | ≥ 7.0 |
| Compression Recovery | ASTM F36 | % | ≥ 40 | ≥ 35 |
| Thermal Conductivity (in-plane) | ASTM E1461 | W/m·K | 80 - 120 | 100 - 140 |
| Thermal Conductivity (through-plane) | ASTM E1461 | W/m·K | 5 - 10 | 8 - 15 |
| Maximum Service Temp (Inert) | - | °C / °F | 3000°C / 5432°F | 3000°C / 5432°F |
| Maximum Service Temp (Oxidizing) | - | °C / °F | 450°C / 842°F* | 450°C / 842°F* |
| pH Value | ASTM E70 | - | 5 - 7 | 5 - 7 |
| Chloride Content | ASTM D512 | ppm | < 50 | < 50 |
*With appropriate oxidation-resistant treatment or in short-term service.
| Parameter | Specification |
|---|---|
| Standard Sheet Thickness | 0.15mm, 0.2mm, 0.25mm, 0.4mm, 0.5mm, 0.8mm, 1.0mm, 1.5mm, 2.0mm, 3.0mm (Custom thickness available) |
| Standard Sheet Dimensions | 1000mm x 1000mm, 1200mm x 1200mm, 1500mm x 1500mm (Custom sizes available) |
| Roll Dimensions (Width x Length) | 1000mm x 30m, 1200mm x 30m, 500mm x 50m |
| Core Material | 3" (76mm) cardboard or plastic core for rolls |
| Standard Packaging | Sheets: Individually interleaved with paper, packed in strong carton boxes. Rolls: Wrapped in plastic film and reinforced on pallets. |
The versatility of our graphite sheet makes it a critical material in numerous high-performance sectors.
What is the main difference between a graphite sheet and a traditional rubber or compressed non-asbestos (CNA) gasket?
The primary differences are performance under extreme conditions. Kaxite Sealing's graphite sheet offers vastly superior temperature resistance (up to 3000°C inert), excellent chemical resistance, and better sealing performance with lower required bolt load. Unlike organic materials, it does not harden, crack, or decompose over time, providing longer service life in demanding applications.
How does the graphite sheet perform in oxidizing atmospheres at high temperatures?
Pure flexible graphite begins to oxidize significantly in air around 450°C (842°F). For applications above this temperature in oxidizing environments, Kaxite Sealing offers specially treated grades. These include oxidation-resistant impregnations (with inhibitors like phosphate) or laminated versions with metal foils (such as Inconel or stainless steel) that protect the graphite core, extending the service range up to 800°C or higher.
Can Kaxite Sealing graphite sheets be used in food, pharmaceutical, or ultra-pure water applications?
Yes, but specific grades must be selected. We offer high-purity, low-chloride (<50 ppm) and low-sulfur graphite sheets that meet the stringent cleanliness requirements for these industries. It is crucial to specify your application's purity standards when consulting with our technical team to ensure compliance.
What is the best way to cut and fabricate a graphite sheet into a gasket?
Graphite sheets are easily fabricated. For prototypes or simple shapes, they can be cut with a sharp utility knife, scissors, or a die-cut press. For high-volume production of complex shapes, clicker dies or CNC cutting machines are recommended. Always cut on a clean, flat surface and use a sharp blade to prevent fraying. Kaxite Sealing also offers precision die-cutting services to supply ready-to-install gaskets.
How do I determine the correct thickness and density of graphite sheet for my application?
Selection depends on several factors: flange surface condition, pressure, temperature, and media. As a general rule, for standard gasketing on reasonably flat flanges, a 1.5mm thick sheet is common. For higher pressures or uneven surfaces, a softer, lower-density sheet may compensate better. For thermal interface materials, thinner sheets (0.15mm to 0.5mm) with higher density are often used for optimal heat transfer. Our engineering team can provide detailed selection guidance based on your specific parameters.
Does graphite sheet require a sealant or adhesive during installation?
Typically, no. The graphite sheet is a self-sealing material. Applying adhesive can hinder its natural conformability and recovery properties. It is generally installed dry. For very rough surfaces, some users apply a thin graphite-based paste to fill micro-imperfections, but this is not usually necessary with Kaxite Sealing's conformable grades.
What are the storage and handling precautions for graphite sheets?
Store in a cool, dry place away from direct sunlight and moisture. Keep in the original packaging until use. Handle with clean gloves to prevent contamination from skin oils. While flexible, the sheets can be brittle if bent over a sharp edge, so avoid sharp folds. For rolls, store them lying flat or on their core to prevent deformation.
Can graphite sheets be laminated or combined with other materials?
Absolutely. Kaxite Sealing specializes in producing composite materials. Common laminations include graphite with stainless steel, aluminum, or other metal foils for added strength and oxidation protection. We also produce graphite sheets with inserted wire mesh or bonded to non-woven substrates for enhanced handling and mechanical properties. These composites expand the application range significantly.
