11/2/2023 0 Comments Ford 4 viscosity cupIn place of the flow formulae that was developed in the earlier work a graph was included which related viscosity in stokes to efflux time in seconds for the Numbers 2, 3 and 4 Ford Viscosity Cups. In D 1200-58 (1965) the dimensions of the cup and the orifice were shown. There was minor revision to this method in 1958 with reapproval in 1965. Where the cup type instrument was applicable the preference was very heavily weighed in favor of the Ford Viscosity Cup series.īased on the above work and on the stated preference for the Ford Viscosity cup series, an ASTM Standard Method of Test for Viscosity of Paints, Varnishes, and Lacquers by Ford Viscosity Cup was adopted in 1954 under ASTM Designation D 1200. This permitted comparison of results between the 17 listed different types of cups above stated time minimums.Īlso included in the above work were the results of an industry survey on the preference of viscosity measuring devices. The above referenced work included mathematical formulae which accommodated non-linearity at the lower range of each cup due to eddy current turbulence at the orifice. ![]() ![]() The results of this work were published in the October 1950 ASTM Bulletin, No. The first known industry attempt to relate the results of various types of viscosity cups and to tie each to mathematical formulae based on fundamental measurements was by a sub-committee of ASTM Committee D-1 on Paint, Varnish, Lacquer and Related Products.
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