Every- Fire door should have an appropriate - Fire door keep shut? sign fitted. Photoluminescent signs to identify them if lights are out or obscured by smoke.Material Options ExplainedChoose the right material for your application:.Rigid Plastic: Lightweight, gloss white PVC with high impact strength. Suitable for both internal and external safety signs. Easily drilled for wall fixing.Self-Adhesive Vinyl: A high gloss, flexible PVC vinyl with self-adhesive backing. Suitable for applying to most smooth, dry and clean surfaces. Ideally suited for internal signs.Photoluminescent Rigid Plastic: 1.2mm Rigid PVC with photoluminescent (glow in the dark) pigmentation. Afterglow properties exceed PSPA Class C grade, as measured to DIN 67510, provides razor sharp definition even in blackout conditions.Photoluminescent Self Adhesive: Flexible PVC with photoluminescent (glow in the dark) pigmentation. Afterglow properties exceed PSPA Class C grade, as measured to DIN 67510, provides razor sharp definition even in blackout conditions.