Headgear is an important part of Personal Protective Equipment. Chemical resistant means that it allows no measurable amount of the pesticide being used to move through the material during use. A handler may omit some of the PPE required if working in a closed system or an enclosed cab. How to Comply manual. Get a new one.
Few hats survive machine washing with their brims and shape in tact.
Dust from farming may contain pesticide residues that could contaminate your dishwasher and subsequent loads of dishes. Dishwashers generally retain a pool of water from one load to the next to keep gaskets, etc. from drying out. What you rinse off the hat today, you could deposit on your dishes tomorrow. Children and adults should wear crash helmets for riding bicycles, motor scooters, or motorcycles. Brain injury from accidents may be prevented or be less severe if appropriate head protection is worn.