According to the decree n°78-166 of January 31, 1978, the producers and packagers of prepackaged products are required to provide, on the average of the lots, the exact quantity indicated on the label. In order to respect this obligation of metrology, it is necessary to control the weights of the prepackaged products in order to guarantee the fairness of the commercial exchange. These obligations apply to the food industry as well as to the cosmetics, perfumery and pharmaceutical industries, for products such as foodstuffs, beverages, cleaning products, etc.
There are mainly two types of weight control:
- The complete batch control, where each package produced is weighed using an approved scale, eliminating packages outside the tolerance.
- Statistical control, which involves the weighing of a sample of packages from the entire batch during its production, following the prescribed rules of sampling and time.
Regarding statistical control, the General Directorate for Competition, Consumption and Fraud Control (DGCCRF) has imposed new requirements, including the implementation of control charts, mean and standard deviation.