NF P61-402-1:1991 Ceramic tiles. Extruded ceramic tiles with a water absorption of E superior to 3 per cent and inferior or equal to 6 per cent (group AIIa). Part 1.
1991NF P61-402-1:1991 Ceramic tiles. Extruded ceramic tiles with a water absorption of E superior to 3 per cent and inferior or equal to 6 per cent (group AIIa). Part 1.