Fire Retardant Formula [BS4735 1974] Flints supply the latest HCFC free system. The mix ratio is 1:1 by volume but the ISO component should be added to the RES component. The best way to mix is with a paint mixer on a drill for 20sec. The foam will start to rise after 30-40 seconds and should be poured immediately. Foam thicknesses should be limited to 150mm for each pour. If being used in a mould, use a soft wax release agent [see page 1.73] and ensure adequate vents to allow excess air or material to escape. Failure to do this could be dangerous. Rise time: 180sec. The system is slightly more temperature sensitive than the old foams and they will cure best in temperatures up to 300 but temperatures below 180 could lead to a poor cure. We recommend that the liquids are stored in a warm area for several hours prior to use to warm right through. Therefore for best results: warm through, accurately measure and mechanically mix. 1kg expands to approximately 1 cu. ft.
