UK Industry Leader
Of cellular solutions
Global Accreditation
IATF16949 & ISO14001
Experience of
Over 50 years
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UK Industry Leader
Of cellular solutions
Global Accreditation
IATF16949 & ISO14001
Experience of
Over 50 years
When specifying materials for gaskets, seals, cushioning, vibration control or thermal insulation, two of the most common choices engineers and designers weigh up are cork or foam.
Both materials have stood the test of time and continue to play vital roles in industrial and commercial applications, but understanding which one is right for your project requires digging deeper than price tags and surface impressions.
As a leading UK material supplier with decades of experience in custom die-cut parts, gaskets, pads and insulation solutions, Ramsay Rubber works with cork and foam materials across countless industries, from automotive sealing to HVAC gasketing and bespoke protection products.
Cork is a natural material harvested from the bark of cork oak trees. What makes it unique is its closed-cell honeycomb structure, giving it elasticity, compressibility, resilience and natural inertness.
At Ramsay Rubber, cork materials, including natural cork and neoprene-bonded cork, are used for gaskets, pads, tapes and sealing strips that offer lightweight but effective protection against air, water and dust migration.
Natural compressibility and rebound: Cork can be compressed and still recover much of its shape, making it excellent for sealing uneven surfaces.
Hydrophobic and oil-resistant: Cork resists water absorption and many oils, which helps it maintain sealing performance in dynamic environments.
Chemical and ozone resistance: Especially when combined with rubber (e.g. neoprene or nitrile), cork can stand up to chemical exposure in automotive and industrial settings.
Acoustic and vibration damping: Its cellular structure helps reduce noise and vibration transfer.
Thermal insulation: Cork naturally provides insulation against heat and cold.
Sustainability: Cork is recyclable and doesn’t require cutting down trees (the bark regrows), making it an eco-friendly option relative to many synthetic alternatives.
Cork’s combination of resilience, flexibility and natural sealing ability means it’s often used for:
Gaskets and seals around machinery covers, pumps, valve housings and engine parts.
Anti-vibration pads and NVH solutions in vehicles and industrial systems.
Thermal insulation where temperature differences must be managed.
Protective pads and pads under heavy plant machinery to reduce noise and vibration.
Foam is a broad category of engineered cellular materials, typically made from synthetic polymers like polyurethane, polyethylene, PVC, EPDM and specialty blends.
Unlike solid materials, foam contains tiny gas-filled cells, which can be open or closed, significantly affecting performance.
Foam’s versatility comes from its engineered cell structure, which can be tuned for a range of performance characteristics:
Closed-cell foams offer excellent resistance to water, air, and many chemicals, making them ideal for robust seals and weather-resistant applications.
Open-cell foams are effective for cushioning, acoustic insulation and vibration control where compression and rebound are needed.
High compression recovery: Foam tends to conform to uneven surfaces and settles into grooves or tolerances, improving sealing performance.
Material diversity: Foams can be engineered to resist extreme temperatures, fuels, oils, steam, ozone and UV depending on the base polymer selected.
Fabrication flexibility: foam sheets and strips can be die-cut, CNC machined or laminated with adhesives to fit tight manufacturing tolerances.
Depending on the foam type chosen, its uses can range widely:
Seals and gaskets in industrial equipment, HVAC systems and electrical enclosures.
Insulation and NVH barriers in vehicles, appliances and machinery.
Cushioning and protective packaging, particularly with polyurethane or polyethylene foams.
Environmental sealing against moisture, dust and air infiltration.
Cork: Cork offers reliable sealing performance where surfaces are moderately irregular. Its natural compressibility ensures a tight fit in gaskets, especially when paired with bonding rubbers that improve fluid resistance.
Foam: Foam often surpasses cork in sealing applications, especially in engineered closed-cell varieties. By compressing deeper into gaps and tolerances, sometimes up to 50% of its thickness, foam creates an effective positive seal against air, liquids and gases.
Cork: Natural cork’s elasticity helps it conform to non-planar or slightly uneven surfaces, but its flexibility is limited compared to engineered foams.
Foam: Foam’s inherent cell structure and wide diversity of densities mean it can be tailored for flexibility, making it excellent for compressible seals or gaskets where surface irregularities are a factor.
Cork: Natural cork resists moisture, many oils and ozone but has a narrower usable temperature range than many high-spec foams.
Foam: Certain foam types (e.g., silicone or polyamide) outperform cork in extreme environments, offering high temperature stability, broad chemical resistance and long-term outdoor durability.
Cork: Cork’s natural cellular structure gives it good vibration damping, making it useful for noise reduction and NVH solutions.
Foam: Open-cell foams are excellent at absorbing sound and attenuating vibration across a wide frequency range. The adaptability of foam densities allows designers to fine-tune acoustic properties.
Cork: As a natural and renewable material, cork has a clear sustainability advantage; it’s recyclable and regenerative.
Foam: Most foams are synthetically produced and may not be biodegradable. However, recyclable closed-cell options and recycled foams (e.g., ECOcell) reduce environmental impact.
Cork: Cork can be cost-effective for simpler gaskets and sealing applications, but its natural sourcing and processing sometimes make it more expensive than basic foams.
Foam: Foam’s manufacturing scalability and wide range of densities often make it more cost-effective for large volume, consistent gasket runs, especially when adhesive tapes and self-adhesive options are considered.
Foam gaskets, especially closed-cell PVC or EPDM foam, outperform cork due to superior weather, moisture and chemical resistance. Foam seals maintain performance over repeated compression cycles and environmental exposure.
Cork, particularly when bonded with neoprene or nitrile rubber, offers a balance of flexibility, cost and oil resistance for engine covers, valve housings and fuel-related seals.
Foam’s tunable density and open-cell structure allow designers to target specific frequencies and vibration modes, making it excellent for NVH components.
Cork’s renewable nature and biodegradability make it an attractive choice where sustainability is a priority, for example, protective pads or natural vibration dampeners.
When choosing between cork or foam, the “better” material isn’t universal, it depends on your performance requirements, operating environment, budget, sustainability goals and fabrication needs.
Choose Cork When:
You need a natural, sustainable option
Your application requires lightweight, resilient gasketing
Vibration damping and moderate sealing are priorities
Chemical exposure isn’t extreme and temperature ranges are moderate
Choose Foam When:
You need high-performance environmental sealing
Your application involves moisture, extreme temperatures or chemical exposure
Acoustic insulation or vibration tuning is critical
You require flexible, manufacturable and consistent material performance
Whether your application favours cork, foam, or a combination of materials, Ramsay Rubber has the expertise and capacity to support your project from material selection to final production.
Ramsay’s partnerships with top suppliers such as Nitto, Recticel, Armacell, Sekisui, Avery Dennison, 3M, and Zotefoams ensure that we deliver the highest quality materials, meeting industry standards and fulfilling diverse client requirements.
Ramsay Rubber are IATF16949, ISO19001 and ISO14001 accredited. All our materials are registered in accordance with IMDS and are ROSHH/REACH compliant. Ensuring that we meet the needs for neoprene products across automotive and Industrial markets, for several key sealing applications.
Whether you need foam gaskets for automotive, electrical, or renewable applications, Ramsay Rubber provides the perfect solution.
Choose Ramsay Rubber for all your gasket needs and benefit from reliable, high-performance sealing solutions.
For more information about how our construction product solutions can serve your business, get in touch today.
Please feel free to get in touch, to speak with one of our team of experts or simply fill out our online contact form below. We look forward to hearing from you.
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Ramsay Rubber & Plastics Limited
Vulcan Road, Bilston
West Midlands WV14 7HT
T +44 (0) 1902 407150
F +44 (0) 1902 407160
