Mixing the Catalyst with Liquid Rubber
When EPDM rubber is chemically resistance-cured, it resists polar solvents, alkalis and acids. The cure system includes a two-component peroxide heat resistance that becomes initiated at 302° F.
Physical Makeup
EPDM Liquid Rubber is very similar to traditional EPDM makeup. The most crucial qualities include:
- A high resistance to water, ozone and ultraviolet stability, and overall fantastic anti-aging characteristics for many years.
- A temperature tolerance that ranges from -62° to 300° F.
- It is both alkali and acid resistant.
- Holds up against ponding water even before it’s fully cured.
What is the Spread Rate?
The ideal thickness is 20 mil. of dry film, which can be spread to 42 square feet per gallon onto a smooth area. When assuming a 45 square foot gallon, the specs are:
- 8 pounds per mixed gallon
- 680 psi tensile
- 62° F brittle point
- 180-200% elongation
What is the Cure Rate?
The quickness of curing depends wholly on temperature and oxygen availability. Oxygen is required in order to activate the catalyst. Keep in mind that temperatures vary drastically in some regions, and it may take several weeks for a full cure to take place if EPDM Liquid Rubber is applied during a cool season. However, even in a non-cured state, it will withstand water and rainfall.
| Technical Properties of EPDM | |
|---|---|
| Polymer Properties | |
| Specific Gravity | 0.87 |
| Shelf Life | One Year |
| Pot Life | 3-4 Hrs depending on temperature. High temps approx. 1-1.5 hrs |
| Color | Available in White and Black |
| Vulcanizate Properties | |
| Hardness, Durometer | 30A to 90A |
| Tensile Strength, Mpa (psi) | 6.9 to 20.7 (1000-3000) |
| Elongation, % | 180-200% (depending on air temperature) |
| Compression Set B, % | 20-60 * |
| Useful Temperature Range | -60° to 300° F (-50° to 150° C) |
| Brittle Point | -60° (-50°C) ** |
| Volume Resistivity, ohm-cm | 1016 to 1017 |
| Dielectric Strength,v/mil | 500-1000 |
| Dielectric Constant | 2.2 to 3.0 |
| Tear Resistance | Fair to good |
| Abrasion Resistance | Good to excellent |
| Resilience | Fair to good |
| Environmental Resistances | |
| Ozone | Excellent |
| Oxygen | Excellent |
| Oils and Gasoline | Poor |
| Water | Excellent |
| Steam | Excellent |
| Oxygenated Solvents | Good to excellent |
| Halogenated Solvents | Fair to poor |
| Phosphate Fluids | Good to excellent |
| Alkali's | Good to excellent |
| Acids, Dilute | Excellent |
| Acids, Concentrated | Good to excellent |
| Electrical Properties | Excellent |
| Features | |
| Advantages | Electrical Properties Low Temperature Flexibility Resistance to weathering, water, steam, heat cost |
| Limitations | Hydrocarbon resistance Temperature above 350° F (177°-C) Flame resistance |
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