What are the density values for glycols and glycol-water solutions?
Density is the weight per unit volume of a mass. Density varies with temperature and the graphs below show the densities of Dow’s glycols and glycol-water solutions over a range of temperatures. The first two graphs show that the densities of PG-water solutions and DPG-water solutions may be the same for two concentrations. Therefore, density alone is not a reliable method of testing for solutions concentration. Although the graphs below show the densities of glycols and glycol-water solutions, it may sometimes be desirable to know the specific gravities at certain temperatures. The specific gravity can be obtained by dividing the density of the glycol or glycol-water solution by the density of water. Densities, and therefore specific gravities, vary with temperature; hence it is necessary to indicate the temperatures of both the glycol and water. The specific gravity of PG, the density of which is 1.037 at 77°F (25°C), when compared to water, which has density of 0.997 at 77°F (25°C),
