This depends on the temperature but you can take a look at http://www.engineeringtoolbox.com/ethylene-glycol-d_146.html T = 40°F -> approx. 44.4 vol% T = 80°F -> approx. 52.3 vol% T = 120°F -> approx. 63 vol% T = 160°F -> approx. 78 vol% T = 200°F -> approx. 95.3 vol% This depends on the temperature but you can take a look at http://www.engineeringtoolbox.com/ethylene-glycol-d_146.html T = 40°F -> approx. 44.4 vol% T = 80°F -> approx. 52.3 vol% T = 120°F -> approx. 63 vol% T = 160°F -> approx. 78 vol% T = 200°F -> approx. 95.3 vol%