2013 – 06/04/2013 – US Labor Department’s OSHA cites Wisconsin’s Castalloy Inc. for exposing its foundry workers to coal tar pitch and formaldehyde Dirk May Law June 4, 2013 2013 – 06/04/2013 – US Labor Department's OSHA cites Wisconsin's Castalloy Inc. for exposing its foundry workers to coal tar pitch and formaldehyde. Click above to read. These are very dangerous chemicals.