Skin
The thresholds for elicitation of allergic contact dermatitis in sensitised subjects range from 30 ppm
(w/w), aqueous solution, for patch testing to 60 ppm (w/w) for products containing formaldehyde.
A threshold for induction has not been clearly established, but it is estimated to be less than 5 %
aqueous solution (ACGIH, 1991).