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Propylene Glycol Concentration & Freeze Point Chart

Compare propylene glycol concentrations, freeze points, boiling points, specific gravity and other typical properties to help determine the right mixture for your application.

Propylene glycol concentration directly affects important performance characteristics such as freeze protection, boiling point and specific gravity. Use the chart below to compare typical properties at common propylene glycol concentrations and help identify the mixture that best fits your application.

Keller-Heartt recommends a propylene glycol concentration of no less than 30%. For help determining the appropriate concentration or freeze protection level for your system, contact our team for application-specific guidance.


Properties 95% Conc. 60% Conc. 50% Conc. 40% Conc. 35% Conc. 30% Conc. 25% Conc.
Propylene Glycol 95% 60% 50% 40% 35% 30% 25%
Performance Additives and Water 4% 40% 50% 60% 65% 70% 75%
Appearance Liquid, Yellow Liquid, Yellow Liquid, Yellow Liquid, Yellow Liquid, Yellow Liquid, Yellow Liquid, Yellow
Specific Gravity
(15/15℃ 60/60℉)		 1.055 - 1.065 1.050 - 1.059 1.043 - 1.054 1.035 - 1.042 1.034 - 1.042 1.029 - 1.038 1.024 - 1.034
pH 50% Glycol 9.0 - 10.5 9.0 - 10.5 9.0 - 10.5 9.0 - 10.5 9.0 - 10.5 9.0 - 10.5 9.0 - 10.5
Reserve Alkalinity (min) 12 6 6 4 4 3 3
Freeze Point Max -6℉ / -21℃
(as 50%)		 -68℉ / -56℃ -34℉ / -37℃ -10℉ / -23℃ -2℉ / -19℃ 5℉ / -15℃ 11℉ / -12℃
Boiling Point Max 317℉ / 158℃
(as 50%)		 232℉ / 111℃ 228℉ / 109℃ 224℉ / 107℃ 222℉ / 106℃ 220℉ / 104℃ 218℉ / 103℃