Product Short Description: A wide tolerance for the reaction is allowed because of the readiness with which water absorbs carbon dioxide from the air. Product Description: BY CLEANSER DIVISION D I WATERFOR LAB BATCH NO : 270905A MOL. FORMULA : H2O M.W : 18.015 Ph : 5.5 - 7.5 Chloride ( cl ) : 0.0001 Silicate : 0.0001 Sulphate : 0.0002 Iron : 0.00001 Hydrocarbon : Nil. Substances reducing permagnate : 0.00004 A wide tolerance for the reaction is allowed because of the readiness with which water absorbs carbon dioxide from the air. Also complies with BS 3978 : 1987 WATER FOR LAB USE GRADE 3