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DATA SHEET
Table No. I shows the results obtained In testing varnish samples containing Aroclor. In each case the oil and resin were cooked together until a proper body was obtained; heating was then stopped, the Aroclor added and stirred in, and as soon as the temperature had dropped sufficiently petroleum spirits was added as a thinner.
The resins used were (l) rosin, (2) ester gum (3) Amberol F-7 , a modified phenolic resin made by Resinous Products and Chemical Company, (4) Resin ST-137.- a pure phenolic resin by Resinous Products, (5) Resin BR-254, a pure phenolic made by Bakelite Corporation, and (5) Durez 550 > a pure phenolic made by Oeneral Plastics, Incorporated.
Color of the varnishes was rated by the Gardner 1933 Color StandsI'd.
The Kauri Reduction is a standard method for evaluat ing the flexibility of varnishes. It must be considered in relation to the kind of oil and resin used and is supposed to give an indication as to the weathering properties of the varnish--that is, increased percentage of Kauri Reduction indicates increased flexibility and better weathering properties.
Polymerized Oitlcica Oil was used in some of the resins and in the tables it is referred to as poly 01ti-l! oil. Amounts of oil, as well as redn and Aroclor, are expressed by weight. Since the oils weigh - approximately eight pounds per gallon, one hundred of oil to one hun dred of resin represents a twelve and a half (12.5) gallon varnish; two hundred of oil to one hundred of resin, a twenty-five (25) gallon varnish, et cetera.
In each varnish 0.5$ lead and 0.05$ cobalt in the form of naphthenates was added as a drier.
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DISCUSSION OF TH8 RESULTS SHOWN IN TABLg It
Aroclor is used in these tests as a replacement for tung oil and it appears to act in that capacity as is shown by the drying times. Take Formula No. 3 as an example. Two hundred tung oil to one hundred of F 7 represents a twenty-five gallon varnish, but with the one hundred of Aroclor 12o2 considered as oil,- we have approximately a thirty-five gallon varnish. The drying time for this varnish corresponds quite closely to what would be obtained from a thirty-five gallon tung oil varnish with F 7. The Kauri Reduction value is somewhat better than would be expected from a thirtyfive gallon tung oil varnish. Throughout the series the Kauri Reduction values are unusually high. This indicates exceptional extensibili ty and prooably can ce translated to mean good durabili ty. The hot water and cold water tests are fairly good. This was to be expected from the oils and resins used, however. Even where whitening did take place, the re covery was usually within permissible limits. The alkali resistance tests which were conducted with five per cent caustic soda solutions at room temperature show up very well. The results do not establish, however, that the Aroclor adds materially to the alkali resis tance of alkali sensitive resins and oils. Because the Aroclors are not affected-by alkalies, we can only be certain that they do not detract in any way from the al lcall resistance of the varnish.
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