Outdoor durability
EPDM is a principal industrial elastomer for components exposed to ozone, UV and changing weather conditions when the full application is suitable.
EPDM compound
Industrial ethylene-propylene rubber
A technical reference for Hamta Polymer EPDM compounds from 40 to 80 Shore A. EPDM is commonly evaluated for water, weathering, ozone and outdoor sealing applications. Compatibility with mineral oils and hydrocarbon fuels must be assessed separately because EPDM is not generally selected for those media.
-45 to +150 C
Typical service temperature
5
Standard hardness grades
ASTM / ISO
Test references
Excellent
Water resistance
Water and steam review
The material family is frequently assessed for water-facing seals and elevated-temperature aqueous service, with compound and process conditions confirmed for the application.
Avoid oil assumptions
EPDM should not be selected for mineral oil or hydrocarbon-fuel exposure simply on the basis of its material code. Use NBR, HNBR or FKM only after technical review where appropriate.
Hamta Polymer EPDM general specifications
Chemical nameEthylene-propylene-diene monomer rubber
Standard designationEPDM (ASTM D1418)
Available hardness range40 to 80 Shore A
Third monomerENB or DCPD; ENB is typically used where faster curing is required
Ethylene content50% to 70% by mass (typical reference: 60%)
Typical continuous service range-45 to +150 C; short peak conditions may differ by compound
ColourBlack and grey; light colours subject to agreement
Specific gravity1.12 to 1.25 g/cm3, depending on formulation
Technical datasheet
EPDM datasheet by hardness
Choose a hardness grade to view the recorded mechanical properties, units and test references.
| Property | Symbol | Unit | Value | Standard |
|---|---|---|---|---|
| Hardness | H | Shore A | 70 +/- 5 | ASTM D2240 / ISO 7619 |
| Tensile strength | TS | MPa | >= 11.0 | ASTM D412 / ISO 37 |
| Elongation at break | EB | % | >= 200 | ASTM D412 / ISO 37 |
| 100% modulus | M100 | MPa | 3.5-6.5 | ASTM D412 / ISO 37 |
| Tear resistance | TR | kN/m | >= 35 | ASTM D624 / ISO 34 |
| Compression set (70 C / 24 h) | CS | % | 12-20 | ASTM D395-B / ISO 815 |
| Resilience | R | % | 40-54 | ISO 4662 |
| Specific gravity | rho | g/cm3 | 1.20 +/- 0.03 | ASTM D792 / ISO 2781 |
| Abrasion resistance | Abr | mm3 | <= 140 | ISO 4649 |
| Water absorption (24 h / 23 C) | WA | % | <= 1.0 | ASTM D471 / ISO 1817 |
| Typical service temperature | T | C | -40 to +150 | - |
EPDM chemical-resistance guidance
This is an orientation aid, not a final compatibility approval. Confirm the specific medium, concentration, temperature and exposure cycle with the technical team.
Water, steam and aqueous media
Water and aqueous solutions within the reviewed service rangeExcellent
Low-pressure steam and hot-water duties subject to compound reviewGood
Weather and outdoor exposure
Ozone, sunlight and general weatheringExcellent
Exterior building and automotive weather exposureExcellent
Acids and bases
Dilute acids and basesGood
Selected polar brake fluids, subject to exact-fluid reviewFair
Oils and hydrocarbon fuels
Mineral oils and petroleum-based hydraulic fluidsPoor
Hydrocarbon fuels and greasesPoor
Excellent
Good
Fair
Poor
Technical notes and limitations
1
Values are typical laboratory guidance for the stated test methods. Finished-part results can vary with formulation, cure, geometry and production conditions.
2
EPDM is commonly assessed for ozone, UV and weather exposure, making it relevant for outdoor sealing, building joints and weather-facing components.
3
Compression set should be validated at the actual operating temperature, strain and time profile of the final assembly.
4
EPDM is not a default choice for mineral oils or hydrocarbon fuels. Evaluate a suitable alternative with the technical team before approving the material.
Where is EPDM considered in our product range?
These product families can be explored from the English product hub. Suitability is determined by the final application, not by the material code alone.
Need help selecting an EPDM grade?
Share the medium, temperature range, pressure, motion, dimensions and target quantity with Hamta Polymer for an application-specific discussion.