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■'!.^'V''fe'x:- <br />irr <br />f\:X <br />!'-' <br />; ^ <br />J- <br />V'-v <br />^-';- <br />!-■'h'vt <br />I..)**- <br />1^:'v <br />$■ <br />►i‘ • <br />t *V. <br />;■■; ■ <br />;4’ <br />) <br />r.'-’ <br />. 1* <br />/ \ <br />If- <br />U -• <br />r <br />■W-. <br />k\ <br />f'- <br />?r <br />Frederic G. Hunt, RE <br />Marina Consultant Specializing In Floati.ig Dorks <br />HUNT ABSORPTION TESr <br />for <br />POLYSTYREI^E AND POLYURF> lANE <br />RELATIVE TO USE AS FLOATING DOCK ^I-OTATION <br />FURFOSE: To get an early indication of the relrc-ve <br />TEST PROCEDURE: <br />1. <br />bency i. f foame. <br />2. <br />3. <br />4. <br />5. <br />6. <br />7. <br />8. <br />Precisely prepare a 1/16 cii.ft. sanple. Size is . be 5.0" x 5.0" x <br />4.32". Cutting is to be by hot wire in a jig for polystyrene and sawing <br />for urethane in order to give consistent dimensioning. <br />Heigh the 1/16 cu.ft. specimen on an accurate scale which reads in either <br />grams or one tenth ounces. Air dry the sanple and weigh daily until the <br />weight has renained the same for three consecutive days. <br />Fill a 5 quart bucket about 1/2 full of water and add . 1 coloring to the <br />water <br />Put the foam block into a container with 4.32" dimension vertical. Put r <br />w^tght on the board on top of the container and fill the container to the <br />top with additional water. Put a 1/2" thick spacer between the foam and <br />the board so that the foam will be conpietely submerged with about 1/2 <br />head of water over the top. Water will have to be added every few days <br />due to evaporation. <br />At designated time periods. 1 hour, daily for 7 days, weekly for a month <br />and every month thereafter remove the foam and weigh it. Bring the foam <br />r»ut of the water with one corner high and drain it for five seconds. Then <br />place the foam on the scale, which will hold water runixing frcm the foam, <br />and weigh. <br />Subtract the original dry weight from the final weight for absorption. <br />Multiply the difference in ounces by 16 to get the absorption for one <br />cubic foot in oiaices. Then divide by 16 to get absorption in pounds per <br />cubic foot. <br />Return the specimen to the container and repeat with periodic weighing <br />until a resulting absorption curve is established. <br />Hhen the weight tests are conplete, cut cube open and note the pattern of <br />the color-.I water which indicates where void areas occur. <br />March 1991 <br />1790 Merriweather Dr. • Co <mbus. Ohio 43221-1327 • 614-451-5113 <br />•-J <br />1 <br />t A Hi