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St. Astier pure and natural hydraulic limes (NHL) have been in production for over 150 years. The characteristics of the raw materials are unique and consist of an undisturbed layer of calcareous rock infiltrated mainly by silica with only traces of other minerals. Millions of tons have been used successfully on a global scale, in the most diverse climatic conditions. During this time the uninterrupted experience of the manufacturer has generated a wealth of technical information both scientific and practical which is always available to the user.