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P-C-111C <br /> TABLE H. Comparison formula <br /> Percent by Volume <br /> Components Type II/ Type II <br /> Ethylene glycol monobutyl ether, conforming to TT-E-776 15.4 7.7 <br /> Diethylene glycol diethyl ether (sp. gr. 0.906-0.911 at <br /> 20/20°C. boiling range 180°-190°C. at .760 mm. acidity <br /> not over 0.02 percent as acetic acid) 13.4 6.7 <br /> Diethylene glycol monobutyl ether (sp. gr. 0.953-0.958 <br /> at 20/20°C. ; boiling range 220°-235°C. at 760 mm. <br /> acidity not over 0.02 percent as acetic acid) 7.8 3.9 <br /> Diethylene glycol monomethyl ether (sp. gr. 1 .025-1 .031 <br /> at 20/20°C. ; boiling range 188°-198°C. at 760 mm. ; <br /> acidity not over 0.02 percent as acetic acid) 4.0 2.0 <br /> Detergent, nonionic conforming to MIL-D-16791 , type 1 3.6 1 .8 <br /> Oleic acid, technical 4.0 2.0 <br /> Monoethanolamine (sp. gr. 1 .017-1 .027 at 20/200C. ; <br /> boiling range 1600-1760C. at 760 mm.) 40.6 20.3 <br /> Sodium silicate solution (0.25 percent by volume of <br /> /1 40° Baume solution?/ in distilled water) -- 55.6 <br /> �V� Sodium silicate solution (2.48 percent by volume of <br /> \�I 40° Baume solution/ in distilled water) 11 .2 -- <br /> h� I <br /> 2/Sodiumthe <br /> silicate, 40' Baume, with ith aequal volume distilled <br /> water. <br /> witha ratio of1 Na20:3.2Si02hasproved <br /> Q — <br /> satisfactory. <br /> 4.5. 19.3 Preparation of piston for testing. Aluminum pistons taken from <br /> internal combustion engines shall be cleaned with hard bristle brush and <br /> mineral spirits or Stoddard solvent. Dry them with paper towelling. Select <br /> six pistons which have at least three-fourths of the surface covered with <br /> heavy crusty soil . Cut each piston into 12 equal sections, leaving an uncut <br /> center section approximately 1/2 to 3/4 inch in diameter (see fig. 2) . From <br /> each piston select not less than 4 pair of matched adjacent sections; that is <br /> sections which are soiled as similarly as possible. Pistons larger than <br /> 4-1/2 inches in diameter may be cut into 16 sections . <br /> 18 <br />