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fifV..-. <br />C ‘ <br />■^;v <br />hC <br />h-V* <br />vi <br />•f <br />if:- <br />r <br />7 <br />6 <br />i' <br />rii <br />}'t:- ■• <br />' <br />K’, *' <br />0'% <br />p,.. <br />-V <br />?< !« <br />E* <br />r\> <br />iMimi <br />To find out more about water absorption characteristics of £^, I s^ed <br />over 125 sanples of iraterial fran dock iranufacturers and float s^pliers. I <br />^ inter^ in finding out how fast foam absorbed water. This toting <br />^rirf"“er ^™val fran a dock of a foam billet «^=h «ei,hed 16 <br />lbs /cu ft. instead of the original 1 Ib./cu.ft. when installed ab^ <br />^iiS; ThiTincrease took place even though the dock was removed from the <br />water f'^’’ five months each winter. <br />A review of dock nanufactu-rer's flotation material specification lis^ <br />claiJiB that their polystyrene foam would absorb oily 1% or 2% of water. Th <br />test referred to in their literature was a ASTM test for insulating bo <br />wSyta^Wropriate for flotation block testing. After nirerous trials ^ <br />^ti2nS“Tnnlized on a test, shown on age 5, which has been lateled <br />tWHunt Absorption Test”, it is a good test to conpare relative ^o^cy <br />«al is easy and inexpensive to perform. When makj^g <=“^«is^^c^rte oi <br />past performance, the quality of the foam can be readily determined in as <br />little as 15 minutes of testing. <br />The seven day test results, <br />as shown on page 6, <br />demonstrate the rapid incr^e <br />in absorption during the first <br />seven days of exposure to <br />water. Some 30 day results are <br />shown on this page.One year and <br />two year results are presented <br />on page 7. So what did these <br />i^esults tell us? "fliat foam <br />absorbs water rapidly in the <br />first hour, still at a good <br />i^te for 30 days and then <br />slowly thru the first and <br />second, years. TSxese tests also <br />showed that there are different <br />qualities of foam. to <br />interesting part of thxs <br />testing program has been the <br />satisfaction that when <br />manvifacturers and suppliers <br />asked to make foam with <br />less water absorption, the <br />itajority of them were able to <br />inprove their foam and meet my <br />and nuntierous other agencies <br />requirements. <br />j nil i-iiRiBii i li! 5!% ^smisiii <br />Specifications referring to the <br />’*Hunt Absorption Test” lostially <br />require the seven day <br />absorption to be less than <br />3 Ibs./cu.ft. <br />IWCftgASKSK. IW WE16HT • fYC.U. PT. <br />30 DAY RESULTS <br />-4-