Why EPDM Stands for “Extremely Perfect Damping Material”
EPDM is short for Ethylene Propylene Diene Monomer, but in real‑world gasketing it can feel like “Extremely Perfect Damping Material”—especially with Armacell Monarch 5032. This low‑density, soft/medium grade meets ASTM D1056 2A2, carries UL94 HF‑1, and is UL‑listed for gaskets and seals, delivering dependable outdoor and enclosure performance against dust, moisture, and weathering.
Why 5032
- Compliance and safety: UL94 HF‑1 flame rating and UL listings for gaskets/seals help simplify enclosure approvals.
- Environmental durability: closed‑cell construction resists water absorption and weathering for long‑life seals.
- Broad operating window: −55°C to 93.3°C continuous, 121°C intermittent, suitable for varied environments.
- Tuned damping/firmness: 25% compression‑deflection of 5–9 psi supports reliable compression set and seal retention in service.
To help you spec the right EPDM across your projects, here’s how 5032 compares with sister grades 5021, 5031, 5013 , and 5055 we carry.
| Grade | 5032 | 5021 | 5031 | 5013 |
5055 |
| ASTM D1056 | 2A2 | 2A1 | 2A1 | 2A3 | 2A5 |
| Density | 4–8 lb/ft³ | 4–8 lb/ft³ | 4–8 lb/ft³ | 7–11 lb/ft³ | 11–15 lb/ft³ |
| Fire Retardant Standards | FMVSS 302 and UL94 HF-1 | FMVSS 302 | FMVSS 302 and UL94 HF-1 | FMVSS 302, UL94 HF-1, and UL-94 HBF | FMVSS 302 and UL94 HBF |
| Firmness | Soft/Medium | Soft | Soft | Medium | Medium/Firm |
| Typical Properties Sheet |
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What’s New in Worldwide Foam
XE Rolls
Our popular extruded crosslinked roll goods (XE) are now made in Elkhart, Indiana!
EM-41
For those who are looking for 2A1 EPDM but not the premium price tag for automotive spec, the EM-41-ST and EM-41-UL are worth a second look.
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