Anyone using or contemplating the use of Hydrofluoric acid should
have a dig through these sites.
http://www.calpoison.org/public/hydrofluoric.html
http://www.emedicine.com/emerg/topic804.htm
http://www.ehs.berkeley.edu/pubs/factsheets/40hf.pdf
http://www.anu.edu.au/hr/ohs/alerts/hydrofac.html
cheers
Al Heywood