Analytical monitoring
Coolant fluids. Neat oils

To limit health risks for employees and for technical and economic reasons, it is advisable to monitor various parameters during use. The INRS, a generalist organization in occupational health and safety, recommends monitoring the following, for example:

• the pH according to the supplier's recommendations;

• the concentration of the active ingredient according to the supplier's recommendations;

• the nitrite content in the event of the actual or suspected presence of secondary amines. This must not exceed 20 mg/L.^–1 ;

• The microorganism content must not exceed 10⁶ CFU/ml^–1. This technical criterion is defined to prevent degradation of the cutting fluid, but it also helps to limit health risks.

More pragmatically, quality control of whole oils can focus on various parameters: