Providing and fixing 10mm thick acid and/or alkali resistant tiles 300 mm x 300 mm of approved make and colour using acid and/or alkali resisting mortar bedding and joints filled with acid and/or alkali resisting cement as per IS : 4457 complete as per the direction of Engineer-in- Charge, in flooring or in dado / skirting on a bed of 12 mm thick mortar 1 : 4 (1 acid proof cement: 4 coarse sand).