Some are. I worked at a shop for almost 12 years and they decided to change coolant brands to save money. After a few months or so I started having problems breathing and had to go to the hospital for testing. I was coughing up blood and when I sneezed it was like a geyser of blood spray. There were 2 or 3 other guys having problems too, although not as severe. It only affected 4 people out of 100 or so. Upon further checking of the M.S.D.S.'s, I found that the coolant when heated from heavy milling turned to steam, and gave off formaldyhide gas which is highly toxic. As soon as I informed the company what was going on they changed back to the original coolant and denied the findings about the formaldyhide gas, essentially covering their asses financially. Lovely people they were. Were... as in I quit shortly thereafter.
JD
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