Dielectric Hydraulic Fluid - Doug's Tip of the Month
Why and where to use a Hydraulic Fluid with a good Dielectric Strength?
Dielectric hydraulic fluid, also known as non-conductive hydraulic fluid, is usually manufactured with high quality base oils and an additive package that includes a dielectric medium (insulator) that will not conduct or at minimum resist conductivity of electricity.
Hydraulic fluids can store electrical energy and discharge it later, like that of a capacitor. The discharge is usually on some metal part of the equipment and can have popping sounds and electrical arcs. Dielectrics have a distinct ability to conduct and store electricity.
This type of hydraulic fluid is a great choice for all hydraulic needs due to their quality formulations as well as their dielectric strength. Quality Hydraulic fluids with a higher VI (Viscosity Index) will have many benefits like:
- Wear Protection
- Oxidation Control
- Rust & Corrosion Protection
- Foam Control
It is common to request hydraulic fluid with a dielectric strength of 35 KV or better when the equipment with a hydraulic system is working near or around any electrical situation. Utility and construction companies with boom trucks, aerial lifts or cherry pickers are some of the most common applications for dielectric hydraulic fluid. Other applications may include many pump systems such as vane, gear and piston pumps as well as PTO pumps. Typical Viscosities for these applications include ISO VG 15, 22, 32 and 46 which can range from 35 kv to as high as 58 kv. Products that we carry such as Petro-Canada Hydrex MV, Kendall Hyken Glacial Blue or P66 Megaflow HVI AW.
It is important to note that the dielectric strength of a hydraulic fluid can be sensitive to moisture and contaminants. Moisture and contaminants can lower the dielectric strength significantly. Proper storage and handling of these hydraulic fluids should be a consideration. The fluid should be kept sealed after the container is opened and stored in a dry location.
Please reach out to your Sales Representative or myself, Doug Vrooman, Senior Technical Advisor, with any questions you may have!
