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A road flux is a product intended to prevent the formation of ice and / or to ensure the melting of ice or snow. It can be spread as is, diluted, dissolved or mixed and be in solid or liquid form. There is currently a wide variety of road fluxes, composition and physico-chemical properties vary depending on the nature and origin of the product. In France, the normative framework for road melters is based on standard NF EN 16811 entitled "Winter maintenance equipment-road melters" *. It is broken down into three parts: Sodium Chloride-Requirements and Test Methods; Calcium Chloride and Magnesium Chloride-Requirements and Test Methods; and other solid and liquid deicing agents-Requirements and test methods. This standard defines for sodium chloride: the chemical requirements (NaCl and sulphate levels), the water content (moisture content), the granulometry, the general requirements (anti-caking content, pH, heavy metals), the information mandatory on the packaging. It includes "product description sheets" replacing the "technical sheets". For the answer to a call for tenders, these must date from 12 months maximum before the date of the offer.