I have a question regarding hot surfaces. In particular how hot is a surface before it is classed as a "Hot Surafce" and requires special handling (gloves etc.) or needs to be protected from contact? Burns and burn severity is caused by a combination of temperature and contact duration, but I have not idea what the corrolation is? I can’t find anything on OSHA about this and I have even drawn a blank in the UK HSE. Any ideas or guidance?