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i <br /> P-C-1IIC <br /> 4.5.21 .2 Test procedure. On the painted surface, not closer than 2 centi- <br /> meters (cm) from the edge, place about 1/2 ml . of the compound. Immediately <br /> cover with a 2.5 cm. watchglass. The space under the watchglass should be <br /> filled with the compound. On another area of the same panel , perform the <br /> test using the comparison formula of 4.5. 19.2, similarly spaced, and not <br /> closer than 2.5 cm. to the compound under test. Perform the test in duplicate. <br /> After 30 minutes, remove watchglass and rub with the moistened tissue described <br /> below. Cup this tissue on the index finger, and rub using pressure and 20 <br /> circular strokes . Use pressure as identical as possible for both test com- <br /> pound and comparison formula. If panels are correctly prepared and test is <br /> properly done, paint will be stripped by the comparison formula. Prepare the <br /> tissue paper (conforming to UU-P-556) by taking two sheets, folding them at ;"51 <br /> the perforation, and then refolding in halves, quarters, eights, and finally <br /> sixteenths . The final edge should be about 3 cm. Moisten the tissue, pressing <br /> out excess water with the thumb and fingers while holding the tissue relatively <br /> flat. Cup moist tissue over the index finger. <br /> 4.5.22 Storage stability. The compound when received shall be thoroughly <br /> mixed by stirring for 5 minutes with a rod or spatula reaching to the bottom <br /> of the original container. Fill a two liter glass stoppered bottle with a <br /> representative sample. Examine the contents for undispersed solids or gel <br /> and note whether any material adheres to the bottom or sides of the container <br /> or has caked and fails to redisperse. It shall be kept together with two <br /> liters of the comparison formula of the same type in a place relatively free <br /> of vibration at room temperature. After six months , plus or minus 5 days, <br /> type II compound shall be compared to the comparison formula for evidence of <br /> separation, precipitation or gelation. For type I compounds, shake the bottles <br /> and transfer the liquid to a large container. Add two liters of distilled <br /> water to the bottle and add to the concentrate and stir gently for 15 minutes. <br /> Note ease with which silicate is dispersed. Compare the precipitate in the <br /> compound with that in the diluted comparison formula. The compounds shall <br /> then be compared for performance in the tests of 4.5. 15, 4.5. 16, 4.5. 17, <br /> i <br /> 4.5. 18, and 4.5.20. <br /> �I 4.5.23 Exposure stability. Place 50 ml . of the compound in a 100 ml . <br /> Griffin beaker containing a short stirring rod. Use two for the compound <br /> under test and two for the comparison formula. Mark the level on the beaker. <br /> Let stand, uncovered, in an area relatively free of drafts . Each day make up } <br /> to the mark with distilled water, stir gently and examine for gelation or <br /> separation. Continue the test until separation of liquid phases occurs . <br /> 4.5.24 Hazardous materials. The supplier shall furnish the toxicological <br /> data and formulations required to evaluate the safety of the material for the <br /> proposed use. <br /> 20 <br />