EPDM Foam ManufacturerEPDM foam thickness and density selection guide
Two numbers decide whether a foam part works: density (kg/m³) and thickness (mm). This guide maps common applications to starting values you can specify today.
What density actually changes
Density is the weight of foam per cubic metre. Raising it makes the foam stiffer, stronger and more resistant to compression set, and usually improves sealing force — at the cost of weight and softness. Lower density gives a softer, more conformable material that absorbs sound efficiently and presses into irregular surfaces.
What thickness actually changes
Thickness controls how much gap the foam can fill and, in acoustic work, which frequencies it absorbs. Thin foam seals; thick foam insulates and absorbs. Automotive body seals typically use thin sections, while acoustic and construction layers are thick.
Starting points by application
| Application | Cell structure | Density | Thickness | Note |
|---|---|---|---|---|
| Automotive door / window seal | Closed | 70–110 kg/m³ | 2–12 mm | Skin or adhesive tape common |
| Glazing and expansion-joint gasket | Closed | 90–150 kg/m³ | 3–15 mm | Compression recovery matters |
| HVAC and pipe insulation | Closed | 70–200 kg/m³ | 6–25 mm | Water resistance and low conductivity |
| Refrigeration lines | Closed | 70–200 kg/m³ | 10–25 mm | Condensation control is the driver |
| Electronics / appliance gasket | Closed | 100–200 kg/m³ | 2–6 mm | Dust and moisture sealing |
| Interior acoustic layer | Open | 80–120 kg/m³ | 10–40 mm | Sound absorption |
| Construction / industrial sound control | Open | 100–140 kg/m³ | 20–60 mm | Often combined with a barrier layer |
| Metal-contact sealing | Open or closed | Any | Any | Specify the sulfur-free grade |
Our range at a glance
| Grade | Structure | Density (kg/m³) | Thickness | Working temperature (peak) |
|---|---|---|---|---|
| Open-Cell A | Open | 80±10 | 2–60 mm | −45 °C to 180 °C |
| Open-Cell B | Open | 100±10 | 2–60 mm | −45 °C to 181 °C |
| Open-Cell C | Open | 120±10 | 2–60 mm | −45 °C to 180 °C |
| Close-Cell | Closed | 70–200 (customized) | 2–40 mm | −45 °C to 182 °C |
| Low Sulfur | Open or closed | Open 70–140 / closed 70–200 | 2–40 mm | −45 °C to 182 °C |
| High Water Resistance | Open or closed | Open 70–140 / closed 70–300 | 2–40 mm | −45 °C to 182 °C |
| High Flame Retardant | Open or closed | Open 80–140 / closed 70–200 | 2–40 mm | −45 °C to 182 °C |
Width range 1000–1500 mm. Available as block, sheet and roll, with single or double-sided skin and sulfur-free options.
Delivery forms: sheets, rolls, tapes and profiles
Thickness and density describe the material itself. How it reaches your line depends on the form you order — the same compound is supplied as sheet, roll, tape or cut part.
- Sheets and plates — 1,000–1,500 mm wide, 2–60 mm thick, cut to your panel size
- Rolls — continuous length for automatic cutting and laminating lines
- Tapes and strips — self-adhesive EPDM foam tape, 1–50 mm wide
- Profiles — extruded D, U, H, E, T and C sections for edge sealing
- Tubes and sleeves — pipe insulation with 6–30 mm wall thickness
- Cut parts and gaskets — die-cut or waterjet-cut to drawing
Tell us the form, the tolerance and the annual volume — most programmes ship as a mix of two or three of the above.
Frequently asked questions
What density EPDM foam should I use?
As a rule: 70-110 kg/m³ for soft sealing and acoustic layers, 100-140 kg/m³ for general sealing and construction, and 140-200 kg/m³ where stiffness, load bearing or tight gaskets are needed.
What thickness of EPDM foam do I need?
Thin sections (2-6 mm) suit gaskets and electronic seals; 6-15 mm covers most automotive and HVAC sealing; 15-30 mm is typical for acoustic and thermal layers; up to 60 mm is available in open cell for construction and industrial sound control.
Can EPDM foam be supplied with adhesive or a skin?
Yes. Foam can be supplied with single-sided or double-sided skin, and converted into sheets, rolls, tape, strips and die-cut gaskets.