... non-toxic alkaline-earth aluminates and silicate.Widely for emergency exit sign.Luminous fire exit safety signs ... signs, general guiding and marking signs2) Be available for Acrylic type or PVC type film.3) It ... weatherproof.4) Can supply different level's quality for your specific reuqirements,like A-,A,B,C ... and D,and the quality D is our top quality for this item, with very long afterglow luminance ...