Lucas Non-Conductive Anti-Wear Hydraulic Oil ISO 22 is formulated with pure base oils and an additive chemistry that provides excellent oxidative and thermal stability. It provides excellent wear protection and reduces deposits and sludge. It contains an effective foam inhibitor which minimizes foam. Dielectric strength of 38 kV makes it an excellent non-conductive fluid. The minimum value required is 35 kV. Dielectric strength is extremely sensitive to humidity and contamination. Once the containers are opened, the dielectric strength cannot be expected to remain at its original value. Containers should be kept tightly sealed and stored in a dry environment.