Certain chemicals can weaken the plastic of the shell leading to rapid deterioration in shock absorption or penetration resistance. Chemicals which should be avoided include aggressive cleaning agents or solvent-based adhesives and paints. Where names or other markings need to be applied using adhesives, advice should be sought from the helmet manufacturer. Replacement Normally, helmets should be replaced at intervals recommended by the manufacturer. They will also need replacing when the harness is damaged or if it is likely that the shock absorption or penetration resistance has deteriorated.
Safety comes before fashion.
Keep a supply of helmets for visitors on site. These should be checked before each issue. Wear a chin strap if you have to bend forward or down, look up or work where it is windy. Wear the helmet so that the brim is level when the head is upright, ie don't wear it sloping up or down as this may significantly reduce the protection it can provide. The manufacturer can be asked to add a label.