Cork rubber sheet is a composite material that brings together two properties no single material delivers on its own: the compressibility and recovery of natural cork, and the flexibility and shelf life of rubber. That combination is why it is specified for sealing, vibration control and gasketing across automotive, electrical equipment, gas, construction, surfacing, industrial equipment, transport and railway applications.
Kaxite supplies four families of cork-based sheet material, each formulated around a different rubber binder so the finished sheet matches the working environment — general purpose, oil and fuel resistant, or weather and chemical resistant. Sheets and rolls are available in multiple thicknesses and densities, and we can assist in matching the grade to your specification.
Each grade below is built around a specific rubber binder. The choice between them comes down to two questions: what is the sheet sealing against, and what is the working environment?
A very economical all-purpose gasket material composed of a 10/20 grind composition cork. Supplied in rolls and sheets. Suited to light to medium duty sealing where cost efficiency is the primary consideration and the working environment is dry.
A blend of high-quality cork and nitrile rubber offering high resistance to oil, aromatic fuels and solvents. Each grade of the H-series can be certified to meet Grades A, B or C of MIL C 6183 B Class 1. Used where the seal comes into contact with petroleum-based media.
High-quality cork blended and bound with neoprene rubber, available in soft, medium and firm densities. The E-series grades can be certified to meet Grades A, B or C of MIL C 6183 B Class 2, and are used in outdoor and chemically exposed sealing applications.
A general-purpose material for light to medium duty applications, mostly used indoors. Cork rubber sheet works well under constant use, has a smooth surface, and does not contain through holes or voids within the rubber-cork matrix.
The four grades share a common cork base but differ in binder and certification path. The table below maps the differences that matter most during specification.
| Grade | Binder | Primary Resistance | Certification | Typical Service |
|---|---|---|---|---|
| Natural Cork Composition | Composition cork (10/20 grind) | Dry sealing, compression | — | Light to medium duty general gasketing |
| Cork + Nitrile (H-series) | Nitrile rubber | Oil, aromatic fuels, solvents | MIL C 6183 B Class 1, Grades A / B / C | Petroleum contact, fuel system seals |
| Cork + Neoprene (E-series) | Neoprene rubber | Weather, ozone, chemical exposure | MIL C 6183 B Class 2, Grades A / B / C | Outdoor, chemical, industrial sealing |
| Cork Rubber Sheet | Rubber binder | General environmental exposure | — | Light to medium duty indoor applications |
Cork granules compress under load and recover when the load is released. Combined with a rubber binder, the sheet keeps that recovery over years rather than losing it after the first few thermal cycles. This is the property that makes cork rubber sheet effective as a flange gasket — it keeps pressing back against the mating surfaces as bolt load relaxes.
Rubber-binder cork sheet does not age the way plain cork does. It holds its dimensions and mechanical properties during long storage, so sheets can be cut from stock on demand rather than ordered just-in-time. For workshops that cut gaskets in small batches, this reduces waste and simplifies inventory.
Cork rubber sheets have a smooth surface and contain no through holes or voids within the matrix. That matters for thin gaskets, where a single void becomes a leak path under pressure. Density grades (soft, medium, firm) let the same material be tuned for different bolt-load and compliance requirements.
The combination of compressibility, vibration damping and chemical resistance has made cork rubber sheet a standard material across several industries.
Four pieces of information are enough for us to recommend a grade and confirm a quotation. If you already have a specification or a part drawing, send that instead — it usually saves a round of questions.
Is the sheet sealing against dry air, oil, fuel, solvent, water or chemical media? This determines whether the nitrile, neoprene or plain cork grade is appropriate.
Sheet or roll, and what thickness. Standard thicknesses are available and custom thicknesses can be produced on request depending on the grade.
Soft, medium or firm. Softer densities conform better to uneven surfaces; firmer densities hold higher bolt loads.
If MIL C 6183 B Class 1 or Class 2 certification is required, tell us upfront so the correct H-series or E-series grade is quoted.
It is a composite of natural cork granules bound with a rubber binder. Different rubber binders — nitrile, neoprene or a general-purpose rubber — produce different chemical resistance profiles while keeping the compressibility and recovery of cork.
Natural cork composition sheet is a composition cork material without a rubber binder, suited to dry, light to medium duty sealing. Cork rubber sheet adds a rubber binder, which improves flexibility, shelf life and resistance to oils, fuels, weather or chemicals depending on the binder used.
The cork and nitrile rubber sheet (H-series). It has high resistance to oil, aromatic fuels and solvents, and is available certified to Grades A, B or C of MIL C 6183 B Class 1.
The cork and neoprene rubber sheet (E-series). Neoprene resists weather, ozone and chemical exposure better than natural rubber, and the E-series grades can be certified to MIL C 6183 B Class 2.
Cork and neoprene rubber sheet is supplied in soft, medium and firm densities. Density selection depends on the required bolt load and the surface compliance needed at the joint.
Yes. Cork-based sheet materials are supplied in both sheet and roll form in a range of thicknesses, with custom thicknesses available on request depending on the grade.
Yes. Send us the media in contact, working temperature, thickness requirement, density preference and any certification requirement. We will recommend the appropriate grade and confirm availability.
The cork and nitrile H-series can be certified to MIL C 6183 B Class 1 (Grades A / B / C), and the cork and neoprene E-series can be certified to MIL C 6183 B Class 2 (Grades A / B / C). Request certification at the quotation stage so the correct grade is supplied.
Tell us the media in contact, required thickness, density and any certification requirement. Kaxite will confirm the grade, availability and lead time — or review your existing specification and quote against it.
Kaxite natural cork composition sheet is an economical all-purpose gasket material made from 10/20 grind composition cork, without a rubber binder. It is supplied in five standard thicknesses (1/16", 3/32", 1/8", 1/4", 3/8" and 1/2") and five standard sheet sizes (12"×12" up to 36"×36"), in both sheet and roll form. The material compresses under bolt load and recovers as load relaxes, giving reliable sealing in dry, light to medium duty applications including flange gaskets, compressor seals, general industrial gasketing and vibration damping pads. Custom thicknesses and sheet sizes are available on request.
Kaxite cork and nitrile rubber sheet is a blend of high-quality cork granules and nitrile rubber (NBR) binder, engineered for high resistance to oils, aromatic fuels and solvents. It is the grade specified when a gasket joint will see petroleum-based media. The H-series is supplied in eight standard thicknesses from 1/32" to 1/2" and five standard sheet sizes from 12"×12" up to 36"×36". Each grade can be certified to meet Grades A, B or C of MIL C 6183 B Class 1. The cork component preserves compressibility and recovery, giving reliable sealing under thermal cycling and repeated bolt-load relaxation. Custom thicknesses and sheet sizes are available on request.
Kaxite cork and neoprene rubber sheet is a blend of high-quality cork granules and neoprene (CR) rubber binder, engineered for high resistance to weather, ozone, salt air, water and general chemical exposure. It is the grade specified when a gasket joint sits outdoors, sees moisture, or operates in a chemically exposed environment. The E-series is supplied in soft, medium and firm densities across eight standard thicknesses from 1/32" to 1/2" and five sheet sizes up to 36"×36". Each grade can be certified to meet Grades A, B or C of MIL C 6183 B Class 2. The cork component preserves compressibility and recovery, giving reliable sealing under thermal cycling and long-term outdoor exposure. Custom thicknesses and sheet sizes are available on request.
Kaxite KXT-GS2052 cork rubber sheet is a compound of granulated cork and synthetic rubber polymer, combined with processing assistants. It offers both the high resilience of rubber and the compressibility of cork, making it suitable for static sealing in low and medium pressure joints. The sheet is produced in two hardness grades — Medium (55–70 Shore A) and Hard (70–85 Shore A) — in thicknesses from 0.8 mm to 100 mm, and three standard sheet sizes: 950×640 mm (untrimmed), 915×610 mm (trimmed) and 1800×650 mm. Technical data follows ISO 4714. Service temperature range is −40 °C to +150 °C. Typical applications include automotive engine gaskets, ship engine and pipework gaskets, petroleum pipeline flanges, transformer housings, electrical equipment and general industrial static sealing.