Semi Open Cell EPDM Sponge Gaskets

Here at Advanced Seals & Gaskets Ltd we convert and supply a range of high-quality EPDM sponge gaskets, in various densities and grades.  One of the EPDM sponges we can offer is a Semi-Open Cell EPDM sponge, sometimes also called a Semi-closed cell sponge or semi-open cell foam.  This material is manufactured in block form, which we can split down into sheets or join together and then split to produce continuous lengths or rolls of materials in thicknesses starting at just 1.5mm from which gaskets can be cut.  

Our Semi-Open Cell EPDM Sponge Gaskets are produced on-site using drawings, samples or measurements provided by our customers, from a simple picture frame gasket to more complex shapes with cut-outs, notches or bolt-holes.  Whether it’s a one-off sample or a multi-thousand batch run, we have a machine designed to quickly and accurately produce perfectly formed gaskets every time.   

Our Semi-Open Cell EPDM Sponge Gaskets can be supplied in a plain finish, laminated in layers to create other thicknesses,  laminated to other materials or coated with a choice of self-adhesives and foils prior to the gaskets being cut.

What are Semi Open Cell EPDM Sponge Gaskets?

Semi-Open Cell EPDM is an extremely soft and flexible grade of EPDM sponge rubber, still manufactured from the chemical components Ethylene Propylene Diene Monomer, but using a different manufacturing process to create the mixture of open and closed cells throughout the material. 

The cell structure of Semi-Open Cell EPDM is created in the manufacturing process by physically "bursting" the closed-cell structure in order to create a product that is softer and therefore easier to compress than the more traditional medium or firm grade EPDM sponge rubber, making them great for creating securely fitting gaskets. 

Semi-Open Cell EPDM Sponge Gaskets sometimes come in the form of a strip or pad but are generally an intricately cut shaped piece of material placed between two surfaces to create a low-pressure seal preventing the leakage of liquids or gas and to seal against the intrusion of dust and debris.

Semi Open Cell Epdm Sponge Gaskets

Product Enquiry

For information on Semi Open Cell EPDM Sponge Gaskets please complete the following quick enquiry or call us on +44(0)1384 252555.






    Product Specification & Key Characteristics

    • Colour: Black
    • Cell Structure: a combination of open and closed cells
    • Temperature Range: -40 ˚C and 100˚C
    • Density: 70 - 130 kg/m3
    • Fire-resistant: (FMVSS302 - FIAT 50433)
    • Resistances: Ozone, UV, high and low temperatures, electricity

    Full technical data can be supplied upon request,
    or downloaded from our online portal.

    Help and guidance

    If you would like to speak to a representative to discuss your specific application or requirements please call our sales office direct on 01384 469100, alternatively you can send an E-mail. Simply click on the link and forward us your details along with your question and we will contact you immediately.

    Samples - Technical Semi Open Cell EPDM Sponge Gaskets

    Samples can be submitted for testing upon request.

    Call now for sample requests or further help.

    Why use Semi Open Cell EPDM Sponge Gaskets?

    Semi-open cell EPDM sponge gaskets offer similar flexibility and compressibility to an open-cell foam, but under compression, they have excellent sealing capabilities more like a closed cell sponge, in order for a gasket to work effectively, it needs to compress and fill the entire space to create pressure and airtight protective seal. 

    Semi-open cell sponges are durable and offer the excellent ozone and weathering resistance of a standard EPDM, but with a slower and better recovery following compression which is suited to sealing applications. 

    Semi-Open cell EPDM sponge can be taken as complete sheet or roll form, or as pre-cut strips, suitable for use as a solution to indoor and outdoor sealing applications, providing protection against air, dust and moisture.

    Benefits of using Semi Open Cell EPDM Sponge

    • Resistance to ozone and UV light
    • Soft and compressible 
    • Combination of open and closed cells
    • Excellent acoustic performance
    • Good compression set
    • Seals against air, dust & moisture
    • Converted onsite into a range of thicknesses and products

    The Advantages of using Semi Open Cell EPDM Sponge Gaskets

    Semi-Open Cell EPDM Sponge gaskets are produced using  Semi-Open Cell EPDM which has a super-soft nature, providing excellent sealing capabilities once compressed.  Due to low compression load, the foam can compensate for dimensional deviations in substrates and can, therefore, be applied to both rough, smooth and low energy surfaces. The material offers resistance to Ozone and UV, has a wide working temperature range of  -40 ˚C and 100˚C and can be used for sealing against water, dust and air. 

    Being such as soft and conformable material, Semi-Open Cell EPDM sponge gaskets can be used to fill gaps and irregularities between two surfaces and to provide a solution to unwanted rattles, noise, vibrations, to seal against air, gas, dust and liquids, and can also be used to cushion between moving parts to reduce friction and damage to components and equipment, they are often found used within HVAC systems, the automotive industry and as window seals, to name a few.

    Grades of EPDM Sponge Available

    ASG stock a variety of other grades and densities of EPDM sponge which can call be used to manufacture gaskets each suited to individual applications. These include firm grade, high temperature and semi-open cell varieties:

    Medium Density EPDM is available in black or white colour options. EPDM sponge is a strong, synthetic material that has a closed-cell structure making it an ideal material for internal and external sealing applications where minimal compression is required for the material to work as an effective seal.  Medium-density EPDM sponge has a density of 90 – 140kg/m3, an operating temperature range of -20°c to +85°c and is flammability tested to  FMVSS 302.

    High-Temperature EPDM Foam is closed cell and highly flexible even at low temperatures, with an amazing temperature range of -50°c to +128°c.  High-Temperature EPDM foam has many excellent mechanical characteristics including thermal and insulation properties, making this material ideal for many industries and applications including HVAC, Refrigeration, Pipeline, Automotive, White goods and Building & construction, etc.

    Firm Grade EPDM Foam is a more resilient material that will not compress as much as the standard grades under load, also this material benefits from increased tear strength and suits some of the more demanding applications such as Automotive, White Goods, Marine, Defence, Building and Construction, etc

    For further information, you can view our online specification sheets or speak to a member of our sales team.

    Have a Question about Semi Open Cell EPDM Sponge Gaskets?

    Please contact us using the form below or by calling us on +44(0)1384 252555.