During the production of hydraulic oils, “additive packages” are introduced into the base oils to give the fluids certain characteristics they need for the demanding conditions of today’s systems. The additives improve viscosity, reduce friction, prevent wear, and allow the fluid to tolerate high temperatures without oxidation. Some oils are produced with toxic aromatics and heavy metals, with a high electrical conductivity, but because of their toxicity and potential threat to the environment, they no longer comply with current, international environmental standards. Other groups of oils are produced with the appropriate, approved additive packages, often labeled as highly refined or synthetic. They contain no toxins or carcinogens, and are free of heavy metals, but due to their metal-free nature, they have a lower electrical conductivity rating. Low electrical conductivity means that any charges that are generated through the oil flow may not be dissipated quick enough, thus causing sparking. Ultimately, this can cause explosions in the reservoir or damages in vital hydraulic components, such as valves and filters.

The sparks can also interfere with or damage expensive electronic components, and form oil-ageing deposits, such as varnish. Varnish then settles on the oily surfaces of the vital components and has a detrimental effect on how well your machine functions. Potential consequences of varnish also includes seized valve spools, overheated solenoids, and extremely short filter element service life.

The Anti-Static Pleat Media (ASP®) element was developed to greatly reduce or eliminate electrostatic discharging problems that can occur during filtration of hydraulic and lube fluids. By combining proven Excellement® media and ASP® technology, it is now possible to offer both high filtration efficiency and
electrical conductivity.

Other key areas that can contribute to Electrostatic Discharge:
▪ Filter Media – media layer construction can influence high voltage charge
▪ Hydraulic Fluids – group II and III have low conductivity
▪ Temperature – higher voltage charge will generally exist with lower temperature