| 摘要 |
The disclosure relates to an indicator device (5) for determining the ageing of an object of plastic, which is degradable by UV radiation. The indicator device is fixedly disposed on or integrated in the object, and includes pigment which is degradable by UV radiation. The degradation of the pigment either follows the degradation of the plastic included in the object or corresponds to a predetermined interval of time in compliance with legislati on or other regulations. The disclosure also relates to a safety helmet which includes an indicator device (5) displaying properties in accordance with th e foregoing. |
