The lighting Gels are a (paper) thin sheet of polycarbonate/polyester and can be placed in front of lights to give a nice colour effect. Filter Gels are made so that they can withstand high temperatures.
Heat Resistant Colour Transparent Acetate Gel Sheet Crafts Lighting 122cm x 28cm
Colour Transparent Acetate Heat Resistant Lighting Filter Gel Sheet Crafts Film
Heat-resistant silicone rubber HB for tin casting, heat-resistant up to 450¯C