Marine Propylene Glycol is a non-toxic antifreeze used in marine refrigeration systems to prevent freezing and corrosion. It circulates as a secondary coolant, transferring heat efficiently while being environmentally safe. Ideal for marine applications, it ensures reliable performance in low-temperature conditions.

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.