Self adhesive semi rigid PVC. Requires no mastic, glue or screws, simply peel off the backing and apply.
Prohibition signs have red as the safety colour with a contrast colour and text in white. Red inks are notorious for fading, especially when used outdoors or when exposed to bright lights. Spectrum Industrial use colourfast inks that are UV protected for longer lasting performance.
Prohibition signs also utilise a circle shape including a symbol or relevant pictogram in black.
It is a duty of all employers to ensure conformity to certain legal practises or requirements. This would include no smoking signs in a public place or place of employment. Other such instructions could be no exit or entry, no use of machinery without following certain precautions or no parking signs.