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The kinematic viscosity measurements of the ASTM (American Society for Testing and Materials) standard oil samples have been carried out as the ASTM cooperative kinematic viscosity testing program under the supervision of the ASTM since 1959. Our laboratory has taken part in this testing program every year since 1969. This paper describes the results of kinematic viscosity measurements obtained on the standard oil samples with normal flow U-tube master viscometers at our Laboratory and the results of comparison among the data obtained with each capillary-type master viscometer at foreign national laboratories and our laboratory over the period from 1969 to 1978. It is concluded that the difference between the viscosity measurements obtained at our laboratory and the foreign national laboratories is within •}0.2% in the range of viscosity less than 2.4•~103 mm2/s(cSt) and +0.00•`+0.42% in the range less than 8.1•~104 mm2/s(cSt) over the temperature range from 20 to 40•Ž.

International Comparison of the Viscosity of the ASTM Standard Oil Samples