The
densities and dynamic viscosities of five different polydisperse
perfluoropolyethers (PFPE) were measured at atmospheric pressure over
the combined temperature range 263.15–373.15 K. For one PFPE
being considered as a high-temperature high-pressure viscosity standard
reference material, measurements were made on two separate samples
to examine the lot-to-lot variability in density and viscosity; significant
variability was observed only for the viscosity data. Experimental
data were correlated as a function of temperature. A simple quadratic
equation was used for density, while three equations (DIPPR, VFT,
and Waterman) were applied to the viscosity data. The DIPPR equation
represented the viscosity data with deviations approximately an order
of magnitude lower than the other two equations.