A study is made of the physical characteristics of linear and cyclic polysiloxanes. It is shown that by plotting v20/v70 versus v20 (v = kinematic viscosity) it is possible to determine the average number of silicon atoms per molecule in a mixture of linear and cyclic siloxanes, and the average ratio of silicon atoms in linear structure to those in cyclic structure and to predict physical constants of siloxanes when two of them are known.
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