Size: Typically available in bulk quantities, ranging from drums (55 gallons) to tanker loads (up to 6,000 gallons).
Grade: Industrial or USP/EP grade, with concentrations ranging from 40% to 100% propylene glycol in water.
Viscosity: Varies with concentration and temperature; at 20°C, 50% solution ~5.8 cP, 100% ~56 cP.
Buoyancy: Lower than water due to higher density (1.036 g/cm³ for 100% PG at 20°C).
Material: Propylene glycol (C3H8O2), often mixed with corrosion inhibitors and stabilizers for refrigeration systems.
Freezing Point: Depends on concentration; 50% solution freezes at ~-34°C, 60% at ~-51°C.
Thermal Conductivity: ~0.34 W/m·K (50% solution at 20°C).
pH: Typically 6.5–8.5 for inhibited solutions to prevent corrosion.
Compatibility: Compatible with most metals (stainless steel, copper, brass) and elastomers (EPDM, nitrile).
Application Temperature Range: -50°C to 120°C for standard refrigeration systems.
