EPDM Sponge Rubber Extrusions

Double Stick Tape Company is a manufacturer of epdm sponge rubber extrusions for continuous sealing profiles used on doors, cabinets, vehicle compartments, electrical enclosures, and equipment covers. We make custom EPDM sponge profiles through profile-die extrusion and continuous curing, covering D, P, E, O, U-channel, hollow, and solid cross-sections. Profiles can be developed from drawings, samples, groove dimensions, closing force requirements, or real sealing gaps, with trial extrusion used to confirm fit before bulk production.

Product Overview

Epdm sponge rubber extrusions are used where a flat EPDM sheet, general gasket sheet, or simple foam strip cannot match the required sealing shape. The EPDM sponge compound is pushed through a shaped die and then continuously cured, so the bulb, stem, cavity, lip, and mounting section keep a stable cross-section along the full length. For production assembly, this helps continuous EPDM sealing profiles maintain a consistent contact line on cabinet frames, vehicle openings, access doors, and equipment edges.

The profile shape should match the way the part closes and compresses. EPDM hollow bulb seals are often selected when a soft closing feel, lower closing force, and repeated recovery are needed. A P profile can combine a compressible sealing bulb with a mounting tail. An E or multi-lip shape can handle uneven frame contact better than a simple round section. A solid profile is more suitable when the seal also needs edge support, impact cushioning, or stronger contact pressure.

For groove fit rubber extrusion profiles, engineers should check groove width, groove depth, stem thickness, bulb height, insertion force, and closing force before tooling. A loose stem may twist or pull out during use, while an oversized bulb can make the door difficult to close. During trial fitting, samples are normally checked for rebound, edge rolling, water path, and contact marks after 24-72h compression.

The extruded skin surface is also worth checking. Compared with sponge strips slit from sheet material, closed cell sponge rubber profiles with a skin surface expose fewer internal cells, keep the sealing face cleaner, and better resist dust, moisture, rubbing, and edge wear during repeated opening and closing.

Benefits

• Custom die development from drawing, sample, groove size, or sealing gap
• Continuous sponge profile structure for long door, frame, and cabinet sealing lines
• D, P, E, O, U-channel, hollow bulb, solid, rectangular, and special shapes available
• Skin surface helps reduce exposed cells and gives a cleaner sealing face
• Hollow profiles support lower closing force and better compression recovery
• Solid or supported sections provide firmer positioning and stronger edge contact
• Sponge grade can be adjusted by 0.45-0.70 g/cm3 density and 10-35 Shore A hardness
• 25% compression deflection can be reviewed to balance sealing pressure and closing force
• Trial extrusion can confirm groove fit, rebound, and contact marks before bulk production
• Optional PSA backing, punched holes, cut lengths, joined corners, or frame assembly

How does the skin surface affect sealing performance in epdm sponge rubber extrusions?

In an extruded sponge rubber profile, the outer skin is more than a surface finish. It creates a smoother working face where the seal touches metal, painted panels, plastic frames, or vehicle body openings. A skin-covered sponge profile usually performs better than a strip cut from flat foam because fewer internal cells are exposed on the sealing surface. This matters on cabinet doors, vehicle hatches, and equipment covers that open and close repeatedly, where the seal must resist moisture, dust, rubbing, and edge wear while still recovering after compression.

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Applications

• Vehicle door seals, trunk seals, hood seals, hatch seals, and body opening seals
• Electrical cabinet seals, control box seals, enclosure door gaskets, and access panel seals
• Machinery covers, inspection doors, equipment lids, and vibration cushioning edges
• HVAC access doors, filter housings, duct service panels, and ventilation equipment seals
• Marine, RV, rail, and specialty vehicle compartments requiring weather-resistant sealing
• Industrial frame sealing where continuous sponge profiles need stable compression contact

What should be checked before designing a groove-fit EPDM sponge rubber profile?

Before opening a custom die, the sealing area should be measured as a real assembly, not only as a drawing. Groove width and groove depth decide whether the stem can sit firmly without twisting. Stem thickness affects holding force, while bulb height and hollow cavity size influence closing pressure and compression recovery. If the profile is too high or too firm, the door may not close smoothly; if it is too soft, sealing pressure may be weak. A trial extrusion sample should be fitted into the real groove, closed for 24-72h, and checked for rebound, edge rolling, water path, contact marks, and long-term fit.

FAQ

Q1: Are these epdm sponge rubber extrusions supplied as flat sheet?

No. They are continuous extruded rubber profiles, not flat EPDM sheet or general gasket sheet.

Q2: Can the profile be made from our sample?

Yes. A custom profile can be developed from a sample, drawing, groove size, or sealing gap.

Q3: Which shape is better, hollow or solid?

Hollow profiles suit soft compression and recovery. Solid profiles suit support, edge protection, or firmer contact.

Q4: Can PSA backing be added?

Yes. PSA backing can be laminated when the application needs easier positioning during assembly.