... :1994 standards (levels:Pure Butanol = 6, Triethanolamine = 6, Ethylene glycol = 6, Dibutyl phtallate = 6, Auto-Diesel (Gas oil ... , Cyclohexane = 6, Diethanolamine = 6, Formaldehyde 37% = 6, Amyl Acetate = 3, Carbon tetrachloride = 4, Cellosolve solvant = 4, Methyl cellosolve ... 6, Tetrachlro ethylene = 6, Hydrochloric acid 37% = 6, Naphta solvent = 2, Petroleum ether = 6,Methyl t-butyl ether = 4).• ...