NF P61-403-1:1991 Ceramic tiles. Extruded ceramic tiles with a water absorption of E superior to 6 per cent and inferior or equal to 10 per cent (group AIIb). Part 1.
1991NF P61-403-1:1991 Ceramic tiles. Extruded ceramic tiles with a water absorption of E superior to 6 per cent and inferior or equal to 10 per cent (group AIIb). Part 1.