Cork sheet is a versatile, sustainable, and high-performance material derived from the bark of the cork oak tree (Quercus suber). Unlike synthetic alternatives, cork is a natural, renewable resource harvested without harming the tree, making it an eco-friendly choice for a wide range of applications. At Kaxite Sealing, we specialize in providing premium-grade cork sheet materials engineered for durability, resilience, and exceptional sealing properties. Its unique cellular structure, composed of millions of air-filled, honeycomb-like cells, grants it remarkable characteristics including compressibility, elasticity, thermal and acoustic insulation, and resistance to moisture and fire.
To ensure you select the perfect cork sheet for your project, it is essential to understand its key parameters. Kaxite Sealing offers a comprehensive range with precise specifications to meet diverse industrial and commercial needs.
| Sheet Size (Width x Length) | Standard Thickness Options | Density Grades | Standard Pack Quantity |
|---|---|---|---|
| 1000mm x 500mm (39" x 20") | 1mm, 2mm, 3mm, 5mm | Medium (180-220 kg/m³) | 10 sheets per pack |
| 1000mm x 1000mm (39" x 39") | 5mm, 10mm, 15mm, 20mm | High (300-350 kg/m³) | 5 sheets per pack |
| 1200mm x 600mm (47" x 24") | 10mm, 20mm, 25mm, 30mm | Industrial (400-500 kg/m³) | 2 sheets per pack |
| Rolls: 1000mm x 10m (39" x 33ft) | 1mm, 2mm, 3mm | Flexible (120-150 kg/m³) | 1 roll per pack |
| Parameter | Test Method | Low Density Grade | Medium Density Grade | High Density Grade |
|---|---|---|---|---|
| Tensile Strength | ASTM D1623 | 0.6 MPa | 1.2 MPa | 1.8 MPa |
| Compression Set (22h @ 70°C) | ASTM D395 | 15% | 12% | 8% |
| Thermal Conductivity (k-value) | ASTM C518 | 0.045 W/m·K | 0.042 W/m·K | 0.040 W/m·K |
| Sound Absorption Coefficient (1000Hz) | ASTM C423 | 0.30 | 0.45 | 0.60 |
| Water Absorption (24h immersion) | ASTM D570 | 8% by volume | 5% by volume | 3% by volume |
The unique combination of properties makes our cork sheet an indispensable material across industries.
Q: How is cork sheet manufactured?
A: The process begins with harvesting cork bark, which is then ground into granules. These granules are carefully sorted by size. For composite sheets, the granules are mixed with a binding resin (like polyurethane or natural resins) under controlled conditions. The mixture is then placed into molds and subjected to heat and pressure in a steam-injection press, causing the resin to cure and bind the granules into solid, cohesive sheets of precise thickness and density. Finally, the sheets are trimmed, sanded, and quality-checked.
Q: Is cork sheet waterproof?
A: Cork sheet is not waterproof but is highly water-resistant and hydrophobic. Its cellular structure contains suberin, a waxy substance that repels water. While it can resist moisture absorption for prolonged periods and will not rot, prolonged submersion can eventually lead to water penetration. For applications requiring full waterproofing, Kaxite Sealing offers cork sheets with specialized coatings or composites.
Q: Can cork sheet be used for high-temperature gaskets?
A: Yes, cork sheet is an excellent material for many high-temperature gasket applications. Standard natural cork composite sheets from Kaxite Sealing are rated for continuous use up to 120°C (248°F) and can handle short-term spikes up to 150°C (302°F). For higher temperature environments, we offer specialty grades reinforced with high-temperature resistant binders. It is crucial to select the correct density and binder type for the specific temperature and pressure conditions.
Q: How do I cut and shape cork sheet?
A: Cork sheet is remarkably easy to fabricate. For thin sheets (up to 3mm), a sharp utility knife, craft knife, or heavy-duty scissors work well. For thicker sheets, a band saw, jigsaw, or hole saw is recommended. Always use a sharp blade to achieve clean edges. For intricate shapes, laser cutting is highly effective and precise. When gluing, ensure the surface is clean and use contact adhesives or PVA wood glue for best results.
Q: What is the difference between natural cork sheet and composite cork rubber sheet?
A: Natural cork sheet is made primarily of cork granules with minimal, often natural, binders. It is prized for its environmental purity and classic properties. Composite cork rubber sheet (also known as cork-neoprene) combines cork granules with synthetic rubber (like EPDM or SBR) binders. This composite offers enhanced resistance to oils, fuels, and more extreme chemicals, along with improved flexibility and compression set in dynamic sealing applications. Kaxite Sealing provides both types to match specific environmental and performance needs.
Q: How sustainable and eco-friendly is cork sheet from Kaxite Sealing?
A: Our cork sheet is one of the most sustainable materials available. The cork oak tree is not cut down during harvesting; only the bark is carefully stripped every 9-12 years, and the tree regenerates it. This process supports carbon sequestration and biodiverse forest ecosystems in the Mediterranean region. We source our cork responsibly and use environmentally friendly binding agents where possible. Our products are biodegradable at end-of-life and contribute to LEED and other green building certification points.
Q: How should cork sheet be stored before use?
A: Store cork sheets in a cool, dry, and well-ventilated area away from direct sunlight, heat sources, and moisture. Sheets should be laid flat on a level surface or stored vertically against a wall to prevent warping or bending. Avoid stacking heavy objects on top. Ideal storage temperature is between 10°C and 25°C (50°F - 77°F) with relative humidity below 65%.
Q: Can cork sheet be painted or stained?
A: Yes, cork sheet can be painted or stained to match specific decorative needs. It is important to use a suitable primer or sealer first, especially on the edges, to prevent excessive absorption. Acrylic-based paints and stains are generally recommended. Always test on a small scrap piece first. For functional applications like gaskets, painting is not advised as it may affect the compressibility and sealing properties.
Choosing Kaxite Sealing means investing in quality, consistency, and expertise. Our decades of experience in material engineering allow us to produce cork sheets that meet the most stringent technical specifications. We offer not just a product, but a solution—providing technical support, custom die-cutting services, and guidance on material selection for optimal performance. Our commitment to sustainable practices ensures you receive a product that is as responsible as it is reliable. From prototype to production run, Kaxite Sealing is your trusted partner for advanced sealing and insulation materials.
