I used to work at a circuit board manufacturing company. The board would be assembled in layers with fiberglass between them. My job was to put them in vacuum sealed steel boxes and place those boxes in an oven. The top rows of the oven were so high you had to get on a step ladder to load them, and the boxes weighed around 80 pounds. Once done, then you had to remove the super hot boxes (the heat of the ovens basically melted the fiberglass to bond the layers together). The boards would have a jagged melted fiber glass edge, so then you had to take them to this other room where there was a diamond bladed circuit saw to cut off all the jagged edges, and a beveling tool to bevel the edges. The room itself was about 5'x8' with no ventilation. You would come out of it covered head to toe in fiberglass dust. We were given dust masks thankfully, but that didn't help too much. After that, the boards had to be de-oxidized. So you would load them in these wire racks, and wheel them on a cart into this chemical room where you bathed them in open vats of different strengths of acid - sulfuric and hydrochloric. You were given a pair of rubber gloves for this task. That's it.
So... I would come home from work covered in fiber glass dust. God knows how much of that shit I inhaled. And once I washed my clothes, which needed to be done after every shift, all the fresh new holes would show up where acid got on them. I had that job for about 6 months. Probably went through a dozen pairs of jeans and 4 pairs of shoes. Seemed like itched for 2 years after.
I worked 3 12 hour shifts per week with a 4 day weekend so it worked well with my 2nd job - which was working at a paintball field as a site manager running games, etc. I made a whopping $8.40/hr at the job (in 1992). I ended up quitting not because of the OSHA-nightmare working conditions, but because I had this asshole for a boss that acted like that job was the only thing I would ever be able to accomplish in life. I'd sure like to pay him a visit now. Fucker. The only good thing about it was that at least I got to listen to Twins games while working, and I worked basically alone so no one bugged me.