Abstract
Tetrahydrofurfuryl alcohol remains mobile at −75 °C. in the presence of 0 to 20% water. It has a lower heat capacity, surface tension, and flash point than ethylene glycol, and undergoes almost identical expansion on heating. Its aqueous solutions exhibit maxima in specific gravity and viscosity at solute concentrations of 80 to 90% but do not distil azeotropically. Swelling and softening of immersed natural and synthetic rubber compounds were more serious with tetrahydrofurfuryl alcohol than with ethylene glycol, but only small differences were shown by radiator hose connections after lengthy immersion and driving tests. The viscosity of anhydrous glycol blends having freezing points of −50 °C. varies greatly with the glycol employed as second component, ethylene glycol – trimethylene glycol being the least viscous of the six binary glycol solutions studied. Substitution of tetrahydrofurfuryl acohol for the second glycol component reduces the viscosity but necessitates use of higher concentrations for equivalent freezing point lowering.
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