The NHL 2 is a pure white low resistance St ASTIER Pure Natural Hydraulic Lime, produced using the use of selected siliceous limestones. The baking of the limestones is carried out in vertical ovens at a temperature below 1250°C and reduced in powder by only the breakdown of calcium oxide, without the need for grinding. NHL 2 is totally devoid of pozzolanic materials, blast furnace slags, flying ash or hydraulic binders of any kind (clinker, cement, etc.), VOCs and according to Standard UNI EN 459-1.
The porosity of Natural Hydraulic Lime NHL 2 guarantees high water vapour diffusion, gives breathability to the substrate, allows the disposal of absorbed water and regulates environmental humidity avoiding the formation of dangerous condensation and moulds. The high basicity of the mixture whose pH is equal to 12.5 makes the surfaces impregnable from biodeteriogenic agents and prevents their proliferation, generating hostile conditions for the survival of pathogenic micro organisms (bacteria, fungi, viruses) causing infections, diseases or allergic reactions. Products obtained with the only NHL 2 binder, being totally mineral; do not constitute "special waste".