EPDM sponge tape and silicone sponge tape are both self-adhesive, closed-cell foam tapes used for sealing, cushioning, gap filling and gasket-style applications. They can look similar, but the difference that actually matters is temperature range and certification, not general performance.
Quick answer: if your application sits somewhere between -10°C and +94°C, EPDM will do the job for less. If you need to go hotter, colder, or need a specific approval such as WRAS potable water contact, automotive or aerospace flammability standards, silicone is the one built for it.
What Is EPDM Sponge Tape?
EPDM sponge tape is a high-density, closed-cell rubber foam strip with a self-adhesive backing, commonly used for weather sealing, cushioning, anti-rattle applications, draught reduction and general gasket-style sealing. It offers excellent resistance to UV, ozone and general weathering, which makes it well suited to outdoor use around doors, windows, panels, enclosures and general contact points.
Supplied in thicknesses from 1mm to 15mm and widths from 10mm to 930mm on 10m rolls.
What Is Silicone Sponge Tape?
Silicone sponge tape exists for the applications EPDM can't cover: sustained heat, sustained cold, or a specific certification your project needs. The sponge material itself is rated -60°C to +230°C, with intermittent resistance to +250°C. The adhesive backing is rated to +200°C, and since a self-adhesive tape is only as good as its weakest layer, +200°C is the number to design around, not the sponge's own rating.
Supplied in four thicknesses (1.5mm, 3mm, 5mm, 6mm) and widths from 10mm to 50mm on 5m rolls, in white.
EPDM vs Silicone Sponge Tape Comparison
| Feature | EPDM Sponge Tape | Silicone Sponge Tape |
|---|---|---|
| Temperature range | -10°C to +94°C | -40°C to +200°C (finished tape, adhesive-limited). Sponge alone: -60°C to +230°C, intermittent to +250°C |
| Thicknesses | 1mm to 15mm | 1.5mm, 3mm, 5mm, 6mm |
| Widths | 10mm to 930mm | 10mm to 50mm |
| Roll length | 10m | 5m |
| Colour | Black | White |
| Certifications | ASTM D1056 SCE-42/RE-42/2A2. FMVSS 302 / UL 94 HF1 flammability | Sponge material stated WRAS approved for potable water to +85°C. FMVSS 302 automotive and FAR/JAR/CS 25 Appendix F aerospace flammability. REACH and RoHS compliant. ASTM D1056 2A2 and D6576 Grades B/C. IP65 dust ingress (joint-design dependent) |
| Not certified for | Food contact, medical use, electrical insulation, structural or load-bearing use | Food contact, medical use, structural fixing. Certifications apply to the sponge material only, not the adhesive backing |
When Should You Choose EPDM Sponge Tape?
EPDM is the general-purpose option, and for most sealing, gasketing and cushioning jobs it's the one to reach for first: doors, windows, panels, hatches, frames, cabinets, draught reduction and anti-rattle applications. It is not rated for the extremes silicone handles, so it's not the choice for anything running hot (engine bays, HVAC ductwork near heat sources, industrial ovens) or genuinely cold storage applications.
When Should You Choose Silicone Sponge Tape?
Choose silicone where the application needs to run hotter or colder than EPDM's -10°C to +94°C range allows, or where a specific approval is required: WRAS potable water contact, automotive or aerospace flammability testing. That covers electrical enclosures, HVAC and lighting installations, and automotive or industrial equipment running hotter than EPDM can tolerate. The trade-off is range: silicone here comes only in white, in four thicknesses and a narrower width range, at a noticeably higher cost per metre than EPDM.
Which Tape Is Better?
Neither is universally better, they're built for different jobs. For general sealing, gasketing and outdoor cushioning, EPDM does the job at a lower cost. Silicone earns its premium on temperature range and specific certifications, not general performance.
Important Suitability Notes
Both tapes should be applied to clean, dry, suitable surfaces. Neither is certified for food contact, medical use or structural fixing. Silicone's WRAS and flammability approvals are stated by the material manufacturer for the sponge only, not the finished adhesive-backed product, so don't assume the approval extends to the adhesive. If you need documentation for a specification or audit, both product pages have a data sheet available.
FAQs
Is silicone sponge tape better than EPDM?
Not universally, just better suited to a narrower set of jobs. For general sealing, gasketing and outdoor cushioning, EPDM does the same job at a lower cost.
Why is silicone sponge tape more expensive?
Silicone as a raw material costs more to produce than EPDM, and the certifications behind it (WRAS, aerospace and automotive flammability testing) add cost a general-purpose EPDM tape doesn't carry.
Can I use EPDM instead of silicone to save money?
Only if your application stays within EPDM's -10°C to +94°C range and doesn't require one of silicone's specific approvals.
Which is better for hot areas?
Silicone, rated to +200°C as a finished tape against EPDM's +94°C. Check your actual operating temperature against both figures before choosing.
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