METALGUARD® H80

METALGUARD H80 is a heat transfer fluid additive package that is based on organic acid technology. It was designed for multi-metal systems and also systems made entirely or partly of aluminum. Traditional heat transfer fluids are usually phosphate-based (like fluids made with METALGUARD H50), exhibit relatively high pH levels and only protect aluminum at operating temperatures up to a maximum of 150°F (65°C). While these fluids provide good protection for most HVAC systems and other heating/cooling systems made primarily of steel with some copper, cast iron and brass, they can cause great damage to all-aluminum systems operating above 150°F, especially all-aluminum boiler systems.

METALGUARD H80’s organic acid-based formulation contains no nitrites, amines, borates or phosphates and provides a pH of 8.0-9.0 in 50% heat transfer fluid. It protects all commonly used metals, including aluminum, up to at least 350°F (176°C), and it is compatible with most plastics and elastomers. Heat transfer fluids made with METALGUARD H80 can be used in any heating/cooling system but it is the best choice for high-aluminum content systems operating above 150°F (65°C). The organic acid salts used in METALGUARD H80 coat all metal surfaces for protection from corrosion. Azoles are included to supplement “soft” metal protection (copper, brass, solder and aluminum). Organic acid depletion rates are very slow, resulting in a fluid life at least as long as phosphate-based fluids without the necessity of boosting the phosphate content periodically.

METALGUARD H80 may be used to inhibit ethylene glycol, propylene glycol or glycerine. A heat transfer fluid concentrate is made with 4% by volume of METALGUARD H80, based on the volume of glycol or glycerine being treated. This concentrate can be diluted with as much as 70% water. To ensure proper corrosion protection, dilutions with more than 70% water must contain the same percentage of METALGUARD H80 as a 70% dilution (30% heat transfer fl uid concentrate). Dilution water should be deionized water. See page 2 for additional information on treat rates for various heat transfer fluid applications.