Compset FR Surfacing System Technical Information
This high-performance fire-resistant epoxy infusion functions with combinations of FST Gelcoat, laminating and infusion hardeners.
FR 191 Fire Resistant Surfacing Gelcoat functions as a fire-resistant barrier to the structural laminate as well as a decorative industrial finish. Fire resistance ratings correlate with the gelcoat thickness and overall laminate design. The gelcoat is applied at a dry film thickness of 900μm to 1200μm or 1.40 to 1.80 kg / m2 per litre.
The gelcoat can be diluted with suitable solvents like xylene or acetone at 8% by volume for spray application. Ensure all thinning solvents have fully evaporated from the film prior to lamination.
The surfacing gelcoat can be recoated once tack free, typically 6 hours at 25oc. Max recoat time is 48 hours. Surface must be abraded for adhesion after 48 hours. Test a small sample area if uncertain.
LH 191 Fire Resistant Laminating Hardener is utilised for hand lamination like tie layers or fully hand laminated designs. Its thixotropic viscosity decreases drainage with resin rich reinforcements such as CSM and heavy woven roving.
Caution: Do not apply surfacing gelcoat when humidity is greater than 85% or when the surface temperature is less than 3 oc above the dew point. High atmospheric humidity or drops in temperature around dew point may result in condensation on the uncured film causing changes in the film surface as a result of hydration. This effect may cause loss of intercoat adhesion. If faced with these conditions, consider re-roughening the surface.
RIH 191 Fire Resistant Infusion Hardener offers an ultra-low viscosity infusible FST system. The distinctive fire-retardant additives prevent clogging or filtration during the infusion process, a common issue with alternative systems.