Semi Open Cell EPDM Sponge Strip

At Advanced Seals & Gaskets Ltd, we supply a range of EPDM sponge strips, in various densities, grades and in various different products cut from the material.  One of the EPDM sponge grades we can offer is Semi-Open Cell EPDM sponge, sometimes also called 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 which can be used to cut into strips. 

By following our customer's samples, drawings or given dimensions, we can produce made to measure Semi-Open Cell EPDM sponge strips using our bandsaws, strippers, log cutters and even presses depending upon the size and quantity of strips required.  In-house production allows us to closely oversee the whole production process to ensure that we consistently produce high quality, competitive prices strips. 

Our Semi-Open Cell EPDM sponge strips are cut from sheets or rolls split down to thicknesses starting at just 1.5mm thick, we can produce strips from 4mm in width and from a few millimetres long up to 50 meters in length (depending on thickness).  During the conversion process, we can laminate layers of Semi-Open Cell EPDM sponge material to produce greater depths or supply them plain, laminated with a choice of self-adhesive foils or even other materials.

What are Semi Open Cell EPDM Sponge Strips?

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 it an ideal material for internal and external sealing applications where minimal compression is required for the strips to work effectively.  

Semi-Open Cell EPDM sponge strips are lengths of material often cut to a specific length or supplied as continuous rolls/coils to be cut as and when needed by the end-user.  Semi-Open Cell EPDM sponge strips are often purchased to be used in the same way as a gasket, whereby they are used to create a seal between uneven surfaces and fill irregularities or for anti-vibration and acoustic insulations.

Semi Open Cell Epdm Sponge Strip

Product Enquiry

For information on Semi Open Cell EPDM Sponge Strip 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 Strip

    Samples can be submitted for testing upon request.

    Call now for sample requests or further help.

    Why use Semi Open Cell EPDM Sponge Strips?

    Semi-open cell EPDM sponge strips are often used in the same manner as gaskets, whereby they fill gaps and irregularities between surfaces and provide a solution to unwanted rattles, noise, vibrations, seal against air, gas, dust and liquids, and provide cushioning between moving parts. 

    Semi-Open Cell EPDM offers similar flexibility and compressibility to an open-cell foam, but under compression, they have excellent sealing capabilities more like a closed cell sponge. 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 parts, all suitable for use as a solution to indoor and outdoor sealing applications.

    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 Rubber Strips

    The super-soft nature of Semi-Open Cell EPDM provides excellent sealing capabilities once compressed, making the material ideal for use in the production of sealing strips.  

    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 a soft and conformable material, Semi-Open Cell EPDM can be converted into a range of products such as strips to be used as vibration and acoustic solutions, within HVAC systems, within 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 Strip?

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