It is important to know the risks for hot work (such as grinding, welding, sawing / cutting) with products that are painted with polyurethane paint.

When heated above 200 °, dangerous amounts of isocyanates can be released, making special personal protective equipment and well-functioning ventilation in the workplace a compulsory requirement at all times. All work on isocyanates is regulated by the National Occupational Safety and Health Directive. 

More information www.isopa.org 

For Sweden 

-The Swedish Agency for Health and Safety at Work on Hardened Plastics, AFS 2005: 18

-The paper "Isocyanates are dangerous" from the Work Environment Authority, tel: 08-7309000

-The book "Hardener" from Prevent, tel: 08-402 02 20