219 Epoxy Resin Hardener? by Ellsworth Tooling Solutions is part of a three-component epoxy system. It was previously known as JB 219 H.
219 Epoxy Resin Hardener is designed for use alongside 219 Epoxy Laminating and Casting Resin and 219 Epoxy Resin Accelerator. The low viscosity system is highly compatible with glass fibre and fillers, and cures at room temperature.