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DOWTHERM™ 4000 inhibited ethylene glycol (EG) is a high-quality thermal fluid with the highest maximum use temperature of any glycol-based fluid. DOWTHERM™ 4000 is dyed a bright, fluorescent orange color to aid in leak detection in a variety of systems.
DOWTHERM™ 4000 is comprised of 92% EG and 8% corrosion inhibitors and water, allowing a greater thermal stability and higher operating temperature up to 350°F (175°C). DOWTHERM™ 4000 also provides burst and freeze protection down to -100°F (-73°C).
DOWTHERM™ 4000 provides exceptionally long fluid life in thermally demanding applications and reduces the frequency of maintenance intervals.
Composition (% by weight)
Ethylene glycol-based fluid (92%)
Performance Additives (8%)
Color: Fluorescent orange
Specific Gravity (60/60°F): 1.13-1.14
pH of solution (50% glycol): 8.5-9.0
Reserve Alkalinity (min): 25.0 ml
Operating range: -60°F to 350°F for heat transfer
-100°F for burst protection
DOWTHERM™ 4000 can be used in a wide range of heat transfer applications with demanding temperature fluctuations — including, but not limited to:
Heating, Ventilation & Air Conditioning (HVAC)
Chill water & hydronic heating loops
Geothermal (ground source heat pumps)
Snow melt & Turf heating systems
Solar hot water heating
Fire water sprinkler systems
Ice skating rinks
Cold storage, refrigerated warehouses & supermarkets (secondary loop)
Thermal Energy Storage (TES)