Accuform MLFE547GP Lumi-Glow Plastic Safety Sign, Legend"Tornado SHELTER", 10" Length x 7" Width x 0.070" Thickness, Red on Glow

Service temperature range: -20° to 149°F. See the message even when the lights go out. In the dark, Lumi-Glow Plastic signs are visible with a green-yellow glowing surface. During light conditions, any light source can ‘energize’ the photoluminescent material with glow rating up to 10 hours. In regular light the sign surface is nearly white with a slight green appearance. Durable, semi-rigid material is ideal for extended indoor and short-term outdoor conditions. Resistant to UV light, some chemicals, and moisture.