B-STRUCTURA is a Biocompatible structural mortar, pre-packaged powder for interior and exterior use according to standard UNI EN 998-2. B-STRUCTURA is totally free of cement and compounds belonging to the clinker group. It consists of a mixture of pure calcareous sands, screened with continuous grain size arc from 0 to 1.4 mm. The binder consists of ST-ASTIER Pure Natural Hydraulic Lime NHL 5 according to standard UNI EN 459-1 and Metakaolin. The lime NHL 5, white, is produced by baking siliceous limestones at temperatures below 1250°C and reduced in powder by calcium oxide only, without the addition of pozzolanic materials or hydraulic binders of any kind.