VITCAS Vermiculite Fireproof Board 60x100cm Refractory to 1100°C (2010°F) with very good insulation properties. For indoor or covered applications including fireplaces, stoves, heaters, range cookers, boilers, night storage heaters, vessels & tanks, wood-fired ovens, kilns etc. Vermiculite is a naturally occurring non-toxic, asbestos-free aluminium-magnesium silicate material. low thermal conductivity, easily machined, stronger than ceramic fibre board. The board can be worked easily with woodworking tools e.g. jigsaw, hand saw, drill etc. Vermiculite Fire Resistant Boards can be sawn, drilled and sanded