Question

head protection protects the head against falling objects or impact. in workplaces with these risks, head protection is mandatory. some types of head protection: hard hat or safety helmet offers protection against falling objects or impact. protective cap protects against small impacts, but not against falling objects. service life a hard hat has a service life of 5 years, on average. this depends on its material. the service life can also be shortened by: chemicals direct sunlight climate the user manual states the maximum service life. extra features a hard hat often offers the possibility to fit a face visor and/or ear defenders. these can protect you against noise and splashed liquids. note:never use a hard hat that has been deformed by a falling object. what has an influence on the aging process of a safety hard hat? climate. the material. direct sunlight.

Explanation:

The text states that the service - life (aging process) of a hard hat can be shortened by chemicals, direct sunlight, and climate, and also depends on its material.

Answer:

Climate, The material, Direct sunlight