Viscosity conversion table

TABLE 2.13 Viscosity Conversion Table Centistokes to Saybolt, Redwood, and Engler units. 

Table B.4 Viscosity conversion table. Source Dow Chemical Co., Midland, MI, USA...

A number of arbitrary viscosity units have also been used. The most common has been the Saybolt Universal second (SUs) which is simply the time in seconds required for 60 mL of oil to empty out of the cup in a Saybolt viscometer through a carefully specified opening. Detailed conversion tables appear in ASTM D2161, approximation of kinematic viscosity V in mm /s(= cSt) can be made from the relation shown in equation 8 ... 

Suitable conversion tables are available (ASTM D341), and each table or chart is constructed such that for any given petroleum or petroleum product, the viscosity-temperature points result in a straight line over the applicable temperature range. Thus, only two viscosity measurements need be made at temperatures far enough apart to determine a line on the appropriate chart from which the approximate viscosity at any other temperature can be read. 

When the amount of catalyst was less than that necessary to give complete conversion, the general shape of the reaction curve remained the same—that is, an induction period followed by rapid propagation up to a plateau of limited conversion. Table III shows the results of experiments with various concentrations of catalyst in each of those experiments, a less than quantitative conversion was reached. Increases in the amount of catalyst produced proportionate increases in the yields. The fact that limiting conversions were reached is evidence for the presence of a termination process. That the intrinsic viscosities and, presumably, the molecular weights were relatively similar over a considerable variation of catalyst concentration suggests that the termination process was not caused by an impurity originally present in the monomer. 

Table 6.5 Some approximate viscosity conversions for viscous fluids.

Test for Saybolt Viscosity, ASTM D 88, and may be determined by use of the SUS conversion tables specified in ASTM Method D 2161, following determination of viscosity in accordance with the procedures specified in the standard method of test viscosity of transparent and opaque liquids. 

Liquid viscosity is usually measured by the amount of time it takes for a given volume of liquid to flow through an orifice. The Saybolt universal viscometer is the most widely used device in the United States for the determination of the viscosity of fuel oils and liquids. It should be stressed that Saybolt viscosities, which are expressed in Saybolt seconds SSU), are not even approximately proportional to absolute viscosities except in the range above 200 SSU hence, converting units fiom Saybolt seconds to other units requires the use of special conversion tables. As the... 

The coefficients are defined for infinitely dilute solution of solute in the solvent L. However, they are assumed to be valid even for concentrations of solute of 5 to 10 mol.%. The relationships are available for pure solvent, and could be used for mixture of solvents composed of molecules of close size and shape. They all refer to the solvent viscosity which can be estimated or measured. Pressure has a negligible influence on liquid viscosity, which decreases with temperature. As a consequence, pressure has a weak influence on liquid diffusion coefficient conversely, diffusivity increases significantly with temperature (Table 45.4). For mixtures of liquids, an averaged value for the viscosity should be employed. 

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