METALGUARD® E-5000

METALGUARD® E-5000 low-conductivity additive package is for use in applications which require both efficient heat transfer and low electrical conductivity. Low-conductivity coolant can be required for applications that require electrical insulation for performance and safety. Coolants made with E-5000 additive maintains a stable, low-conductivity over a long period of time through E-5000’s proprietary formulation of non-ionic corrosion inhibitors. This mechanism is essential to maintain safe operation of battery-powered and other electronics cooling applications. E-5000 coolant protects aluminum, copper, brass, stainless steel, and titanium. It is compatible with most elastomers and other materials including silicon rubber, viton, EPDM and graphite. It is not compatible with carbon steel, cast iron, or zinc/galvanized steel.

In addition to immersion cooling, large transformer cooling, and other non-vehicular applications, METALGUARD® E-5000 can be used to make both types of low-conductivity coolants: ASTM D8565 (hydrogen fuel cell coolant specification) and ASTM D8566 (electric vehicle coolant specification). ASTM D8566 is the specification for electric vehicle coolant which requires the finished coolant to have a conductivity ≤100 μS/cm (microsiemens/cm). ASTM D8565 is the specification for hydrogen fuel cell coolant, and it has a requirement of ≤5 microsiemens/cm in the finished coolant. Coolant with ≤5 μS/cm may be also be used in electric vehicles.

For fuel cell low-conductivity coolant, the deionized (DI) water system must be able to consistently out-put water with the applicable low-conductivity of 0-2μS/cm and if you can buy or manufacture monoethylene glycol (EG) with a conductivity of 0-2 microsiemens/cm then you can make a low-conductivity coolant for hydrogen cell powered vehicles or other low-conductivity applications with a requirement of ≤5 μS/cm For electric vehicle applications, there is more leeway. The DI water, EG and additive must all combine to be less than 100 microsiemens/cm, per ASTM D8566. However, most electric vehicle manufactures want to see ≤50 μS/cm in the new coolant because the coolant will pick-up conductivity from the engine materials of construction over time; therefore, WEBA recommends providing an initial conductivity well below 100. As a note, dye or regular colorant of any type should never be added to the finished coolant. Even a small amount of such ionic solutions will cause a dramatic increase in the fluid’s electrical conductivity.

WEBA Technology can make the finished coolants for customers who do not have access to adequately deionized water and/or ethylene glycol. The E-5000 additive is used to make two different finished coolants: METALGUARD® E-5100 (≤100 μS/cm) and METALGUARD® E-5500 (≤5 μS/cm). METALGUARD low-conductivity products should never be used in internal combustion engine cooling systems.

ASTM Standards

• Meets ASTM D8566 for electric vehicles
• Meets ASTM D8565 for fuel cells