156 Natural NATURAL UNGLAZED A1 no reacciona al fuego A1 does not react to fire <1,25% máx 2 mm 3<E≤6% 5,2x10-6x C-1 20 a 25N/mm2 <393mm3 6 clase 3 a 5 class 3 to 5 Clase 3 Class 3 C R11
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