Semi Closed Cell EPDM
A versatile foam solution for irregular sealing surfaces and light compression applications. Available in custom sizes and formats.
What is Semi Closed Cell EPDM?
Semi closed cell EPDM foam is a flexible, weather-resistant material that offers a balance between compressibility and resilience.
With a slightly more open structure than fully closed cell variants, it adapts well to uneven surfaces and low-pressure sealing environments. It’s commonly used in automotive, HVAC, and construction applications for sealing, cushioning, and insulating tasks.
Technical Information
Semi Closed Cell EPDM Technical Details & Options
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Typically ranges from 3mm to 30mm
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Approx. 80–130 kg/m³
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Supplied plain or with pressure-sensitive adhesive (PSA) backing
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Custom tolerances available depending on format and application
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RoHS and REACH compliant; UL94 HF-1 flame ratings available on selected grades
Benefits
Why Choose Semi closed cell EPDM?
Semi closed cell EPDM offers excellent environmental resistance with greater flexibility — perfect for dynamic applications. Here are the key benefits:
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Flexible & Conformable
Adapts to irregular surfaces with ease for a dependable sea when under compression.
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Weather & UV Resistant
Maintains performance in harsh outdoor conditions.
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Lightweight & Durable
Easy to handle without compromising on strength or lifespan.
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Low Compression Set
Returns to shape over time, ideal for repeated use and dynamic sealing.
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Noise & Vibration Dampening
Absorbs energy effectively in automotive and industrial uses.
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Easy to Fabricate
Suitable for die cutting, slitting, and adhesive lamination.
Delivering Excellence: What Our Clients Say
It is rare to deal with a company that is 100% efficient and 100% reliable while remaining courteous and friendly at the same time. RGH Converting is that rare find. We initially approached them with a complex material challenge, and their team acted as a true extension of our own, providing technical clarity and high-standard prototypes at impressive speed.
Their expertise as a 3M Preferred Converter gave us total confidence in the quality of the final product. I have no hesitation in recommending RGH to any manufacturer looking for precision, reliability, and a partnership-led approach.
Automotive Client
Get in Touch
Have a question or need support with a materials challenge? Our Specialists are here to help.
Speak to our technical team about your project requirements and discover how our converting expertise can provide the right material solution for your application.
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Request a Sample
Request a product sample to test performance in real-world conditions.
Our samples are a great way to evaluate suitability before scaling production and we’re here to support you every step of the way.
Common Industry Uses
Where is Semi Closed Cell EPDM Used?
Semi closed cell EPDM is widely used across industries where flexibility, resilience, and reliable sealing are critical. Typical applications include:
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Automotive
Material Solutions for Performance & Compliance
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Medical
Materials for Medical Devices & Cleanroom Applications
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Electronics and EMC
Reliable Converting for Precision Electronics
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Construction
Sealing, Insulation & Protection for Construction Equipment and Sites
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Military and Defence
Material Solutions for the Military & Defence Sector
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Rail and Transportation
Material Solutions for the Rail & Transportation Industry
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Renewable Energy
Material Solutions for Renewable Energy Sector
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EV Battery
Material Solutions for EV Battery Systems
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Packaging
Material Solutions for Packaging Applications
FAQs
Frequently Asked Questions About Semi Closed Cell EPDM
Curious about how semi closed cell EPDM compares to other foams? We’ve compiled the most common questions to help you understand its unique strengths and how best to apply it.
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What are the main benefits of EPDM foam?
EPDM foam offers excellent resistance to weathering, UV, ozone, and temperature extremes, making it ideal for outdoor sealing applications.
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Is EPDM foam suitable for automotive or HVAC sealing?
Yes. RGH commonly supply EPDM into automotive door seals, HVAC units, and enclosure gasketing due to its long-term durability and compression-set resistance.
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How well does EPDM foam resist oils and fuels?
EPDM provides poor resistance to oils, fuels, and hydrocarbons. For oil exposure, neoprene or NBR-based foams are typically recommended.
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Does EPDM foam accept PSA adhesives?
Yes. EPDM bonds very well with high-performance acrylic adhesives and RGH commonly supply with adhesive backing for easy installation.
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What densities and thicknesses are available?
EPDM foams come in a several densities and can be supplied in thicknesses from thin gasketing layers to thick sealing strips. Custom die-cutting and lamination are standard for RGH.
Need Expert Guidance on Semi Closed Cell EPDM
Our team can help you identify the right grade, thickness, and format to suit your sealing, insulation, or cushioning needs.