410, If your particular liquid is not given in this viscosity chart and you have only one viscosity reading, then locate this point and draw a curve of cP vs. For the viscosity of most any HC, see Fig. How to determine any HC liquid viscosity. Ĭonsistency of NC Test, Same as Viscosity Test of Nitrocellulose (See Vol 2 of this Encycl, p C122-R, test h). This prompted the suggestion by Honk and coworkers that the hydroxyl radical is formed in a tight cage in aqueous solution, still capable of performing one-electron oxidations. Īlthough one- electron oxidations may occur with the intermediacy of the hydroxyl radical, viscosity tests that serve to inhibit the diffusion of HO have provided evidence against the formation of free hydroxyl radicals. from electroviscous effect analysis shows that 0.001 M ionic strength the hydrodynamic radius is at its maximum. The effect of pH on the intrinsic viscosity testing gives a minimum at the isoelectric point at pH 5.1 for gelatin B to pH 9.1 for gelatin A. A recent PATR (Ref 8) made recommendations to update JAN-C-99. However, some of these Fed Specs are outdated and are currently being replaced. US Mil Spec JAN-C-99 (Ref 4) contains the requirements for each ingredient of rC, including a viscosity test for the finished PC as well as std tests for the ingredient under several Fed Specs. High shear/high temperature viscosity test, to assess the oil s capability for resisting shear, and so retaining its viscosity, at high temperatures. tough ness (or ductihty or viscosity) test or sample. measure of ductihty (or tenacity or viscosity), -messer, m.
(degree of) viscosity or ductility or tenacity, -mass, n. Zahigkeits-einheit, /, unit of viscosity (or tenacity or ductility), -grad, m. Extmsion rheometers have been appHed to other materials with some success with adhesives and coatings (10,161). When melt viscosities of a wide range of materials must be measured, rotational viscometers are preferable.
These instmments are useful when large numbers of quahty control or other melt viscosity test measurements are needed for batches of a single material or similar materials. Ī number of instmments are based on the extmsion principle, including sHt flow and normal capidary flow (Table 6). A simple deterrnination of free formaldehyde may be used to foUow the first stage of the reaction, and the build-up of polymer in the reaction mixture may be followed by cloud-point dilution or viscosity tests. In order to inhibit crystallization of methylo1 melamines, the reaction is continued until about one-fourth of the reaction product has been converted to low molecular weight polymer. A melamine laminating resin used to saturate the print and overlay papers of a typical decorative laminate might contain two moles of formaldehyde for each mole of melamine.
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