A-A-1197A
Procedure. A weighted panel, prepared as specified above, shall be held securely in position beneath the rubbing block with the 5 inch dimension parallel to the length of the block. A fresh strip of plain weave,3.5 ounce, cotton flannel cloth (napped both sides) shall be clamped on the rubbing block. Weights shall be added to obtain a total rubbing block weight of eight pounds. Two ml of the rubbing compound shall be measured by means of a calibrated plunger assembly, care being taken to eliminate air pocket. The rubbing compound shall be spread, using a spatula, as evenly as possible over the portion of the flannel which will contact the panel. The rubbing block shall be placed in position and moved through 100 strokes. Remove the rubbing block and discard the flannel. Wash the panel thoroughly using a mild soap solution and a soft bristle brush, dry thoroughly and weigh. Repeat the above procedure on a second panel, using fresh flannel and rubbing compound. Subject the third and fourth panels to the entire procedure listed above except that total rubbing block weight of 15 pounds and only 40 strokes shall be used. Fresh flannel and rubbing compound shall be used for each panel. The first and second panels tested above shall be paired as one set of panels, and the third and fourth panels shall be considered as the other set of panels.
Results. The loss in weight of each panel shall be calculated in milligrams. The average weight loss in each set of two panels shall be calculated. The sum of the two averages shall greater than 10 milligrams and less than 75 milligrams.
Appearance. Examine each panel after completion of the rubbing efficiency test. The lacquer surface shall be smooth, free from orange peel and scratches, and shall be sufficiently thick to completely hide the primer undercoat.
pH value. Place a 10 plus or minus 0.5 gram sample of the rubbing compound in a 100-ml. beaker and add 75 ml. of distilled water. Stir the mixture vigorously for one minute and determine the pH value electrometrically to the nearest 2.1 pH unit.
Preservation, packaging, packing, labeling, and marking (Civil Agencies). The preservation, packaging, packing, labeling, and marking shall be as specified in the contract or order.
Packaging (DOD). The packaging shall be as prescribed in ASTM D3951.
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