Various types of lubricant systems ranging from emulsion to solution synthetic technology were investigated without success, since hazardous components such as chlorine were always required to achieve optimal performance.
Divers types de lubrifiants, allant des émulsions aux techniques de synthèse des solutions, ont été étudiés, sans succès, car des composantes dangereuses comme le chlore étaient toujours requises pour en assurer un bon rendement.