3. What are the two types of VLEP?

The VLEPs defined by the Ministry of Labor following the work of a specialized commission led by the INRS are for the most part "indicative". In other words, they can be temporarily exceeded without risk, thanks to the safety margin used to establish them. This leaves the theoretical possibility for substance handlers to adapt to actual conditions of potential exposure, with a tolerance of 10% to 30% being acceptable depending on the substance.

These "indicative" TLVs are not necessarily applicable in the workplace. However, it is difficult, if not impossible, for manufacturers not to apply them in the workplace, since they are determined by a commission of specialized experts.

Binding" ELVs have also been defined. They oblige employers to comply strictly with these values in workplaces in the country concerned.