Globally Harmonized System of Chemical Classification. Created by the United Nations in 1992 it is still not universally implemented. It should be used across the European Union by June 2015. Household chemicals L to R Sink and drain un-blocker containing Sodium Hydroxide & Sodium Hypochlorite :- Corrosive to metal and skin label; Hazardous to the aquatic environment label. Methylated Spirit containing Ethanol:- Flammable liquids label. Toilet Cleaner containing Formic Acid:- Corrosive to metal and skin label.