Low_Hydrogen,
The reason OSHA is not a fan of those nice light ‘tin hats’ is, because they are “electrically conductive”.
Have a look at the (usually brown) ‘old school’ fiberglass hard hats that iron-workers wear. (Fibre-Metal)
Slag does NOT melt through them, like the plastic ones. (Don’t ask!)
They’re heavy as hell but, you can’t beat them for those ‘special occasions’.
Cheers,
jb