EPDM Sponge Rubber Tape
- Material: Cellular EPDM sponge rubber
- Cell structure: Closed-cell or semi-closed-cell
- Color: Black typical
- Thickness: 1 mm-20 mm typical
- Density: 80-240 kg/m3 typical
- Format: Rolls, slit strips, adhesive-backed tape, die-cut gaskets
Two Side Tape Company is a manufacturer of EPDM Sponge Rubber Tape for compressible gasket sealing, cushioning, vibration damping, and die-cut foam gasket applications. The material is made from cellular EPDM sponge rubber in closed-cell or semi-closed-cell structures, so density, compression deflection, recovery rate, and Shore OO foam hardness can be matched to sealing pressure, gap tolerance, and assembly conditions.
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Product Overview
This EPDM sponge tape is designed as a compressible cellular gasket material, not a solid EPDM rubber strip. That difference matters in real use. A solid strip is usually judged by Shore A hardness and tensile strength, while this sponge rubber tape should be selected by foam structure, density, Shore OO hardness, 25% compression deflection, recovery rate, and compression set.
Closed-cell grades are normally selected when the assembly needs controlled water/air tightness, lower water absorption, and a more continuous sealing surface under compression. Semi-closed-cell grades are better when the part needs softer contact, lower closing force, and easier fit around uneven metal, plastic, painted, or coated surfaces.
Adhesive backing can be laminated for positioning during installation, but it should not be treated as the only working layer. The main gasket sealing effect comes from the compressed EPDM sponge structure between two mating surfaces. For this reason, thickness, density, and compression behavior should be checked before bulk production, especially when the material will be slit into narrow rolls or converted into gasket shapes.
Benefits
- Controlled sealing pressure: Typical 25% compression deflection of 20-90 kPa helps match soft cushioning or firmer gasket sealing requirements.
- Stable recovery after compression: Typical recovery rate can reach >=85% after 24h release, helping the tape keep gap compensation after assembly pressure is removed.
- Reduced air and water passage: Closed-cell EPDM foam tape can support water/air tightness when compressed to a suitable ratio across a continuous contact surface.
- Compression set control: Typical compression set can be <=35% after 22h at 70 C, helping reduce long-term flattening in gasket use.
- Vibration damping and cushioning: The sponge rubber structure absorbs small movement between metal, plastic, coated, or painted parts.
- Practical material boundary: EPDM performs well against UV, ozone, and weather aging, but long-term contact with oil, fuel, or petroleum-based media should be tested first.
How does compression deflection influence sealing, cushioning, and vibration damping?
As a compressible rubber gasket tape, the material must balance softness, sealing force, and recovery. A lower compression deflection helps the foam conform to uneven gaps, while a firmer grade gives stronger pushback for long-term gasket sealing. For most industrial assemblies, thickness alone is not enough. Density of 80-240 kg/m3, Shore OO hardness of 30-65, 25% compression deflection of 20-90 kPa, and recovery after release should be checked together. This balance helps maintain water/air tightness while reducing vibration, impact noise, and small panel movement.
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TDS
Item Typical Value
Product Type EPDM sponge rubber tape for gasket sealing, cushioning, vibration damping, and die-cut conversion
Rubber Structure Cellular EPDM sponge rubber
Cell Structure Closed-cell or semi-closed-cell option
Color Black typical
Thickness Range 1 mm-20 mm typical
Width Range Slit rolls from 5 mm, custom width available
Density 80-240 kg/m3 typical
Foam Hardness Shore OO 30-65 typical
25% Compression Deflection 20-90 kPa typical
Compression Set <=35% after 22h at 70 C typical
Recovery Rate >=85% after 24h release typical
Water Absorption <=5% typical for closed-cell grades
Thickness Tolerance +/-0.3 mm or +/-10% depending on thickness
Width Tolerance +/-1.0 mm typical
Adhesive Backing Plain or adhesive-backed, mainly for installation positioning
Die-Cut Conversion Frame gasket, spacer pad, cushioning strip, hole-cut gasket
Slitting Edge Check 24-72h edge recovery observation before bulk production
Validation Items Density, compression deflection, recovery, adhesive transfer, cutting edge condition
For specimen definition, density measurement conditions, and interpretation of the typical range, see EPDM foam rubber density test data.
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Applications
- EPDM foam gasket tape for electrical enclosures, equipment panels, metal covers, and removable inspection plates.
- Compressible gasket pads for vibration damping between metal, plastic, painted, or coated components.
- Die-cut frame gaskets for control boxes, machinery covers, battery housings, and industrial panel assemblies.
- Cushioning strips for reducing impact noise, panel rattle, and small assembly movement.
- Closed-cell sponge tape for applications requiring limited air or water passage under controlled compression.
- Semi-closed-cell sponge tape for low-force sealing where thin parts or uneven surfaces need softer contact.
What should be checked before die-cutting EPDM sponge rubber tape into foam gaskets?
For die-cut EPDM foam gaskets, wall width, internal corner radius, hole position, cutting edge recovery, and 24-72h rebound after compression should be checked before bulk production. Narrow frame sections or small screw holes may lose sealing contact if the sponge edge is over-compressed during cutting. Sample parts should also be reviewed for thickness tolerance, edge deformation, adhesive transfer, liner removal behavior, and compression recovery after assembly pressure is released.
FAQ
Q1: Is EPDM Sponge Rubber Tape the same as solid EPDM rubber strip?
No. It is a cellular sponge rubber material for compression sealing, cushioning, and gasket use.
Q2: Should closed-cell or semi-closed-cell EPDM be selected?
Closed-cell grades suit water/air sealing. Semi-closed-cell grades suit softer, lower-force compression.
Q3: Can it be die-cut into foam gaskets?
Yes. It can be slit into rolls or die-cut into frame gaskets, spacer pads, and cushioning parts.
Q4: What should be tested before production?
Density, thickness tolerance, compression deflection, recovery rate, cutting edge condition, and sealing contact should be checked.
