ER-4: HIGH PERFORMANCE EPOXY RESIN
Product Description
ER-4 is a high performance single phase resin system that is designed for applications where high modulus and low viscosity are important. ER-4 resin system works well on all fiberglass, carbon, and Kevlar reinforcements.
Applications
- Marine and hand laminating projects
- Filament winding
- RTM processes
- Chemical resistant coatings
Viscosity is low enough to allow exceptional wetout at room temperature.
Hardeners
- EH-101, 102, 103 or 104 laminating hardeners
If application requires high delamination resistance, two phase ‘DR’ series resins should be considered.
Processing
Mix resin and hardener thoroughly at specified ratio. Resin can be heated slightly to lower viscosity. Do not expose resin or hardener to excessive moisture conditions until fully cured. Post-cure resin to 160°F to achieve maximum cure and composite strength. In cases of free standing post-cures, the part should be heated slowly (20-30°F per 30 minute steps) to prevent warpage.
Resin Properties
Morphology: single continuous epoxy phase
| Viscosity, cps @ 25°C | 1,500-1,800 |
| Epoxide Equivalent Weight (EEW) | 180 |
| Color (Gardener) | 2 (max) |
| Weight per Gallon | 9.5-9.6 |
Neat Resin Properties (Cured with EH-102, 24 hours @ RT, 2 hours @160 °F)
| Flexural Modulus, Msi @ RT | .47 |
| Elongation @ Break, % | 5.0 |
| Hardness, Shore D | 85 |
| Glass Transition (Tg), °F | 190°F |
All data given is believed to be accurate based on the material tested. Since the processing and testing is application and user specific, API has no assurance of how the product will be used and therefore cannot make any guarantees as to these properties or the final performance.