Breakage is more than 1/3 dirt. For example I brought in 4 lawn chairs with webbing, rivets, plastic arms. I got breakage price of 16c lb. I tore down 4 similar chairs. I seperated the clean and dirty parts I removed webbing and plastic arms. I got what us considerd dirty sheet, which is considerd having minor attatchments such as rivers small amounts of foreign materials. Dirty sheet is 40c a lb clean is 50c a lb. Personally I don't spend too much time especially on aluminum because of the weight. Basically get it cleaned up but not perfect. The time spent making it totally clean will usully earn you a slave wage per hr. Unless of course you have alligator shears and other machinery to process it clean. Think about how much aluminum it takes to make 20 lbs. Now deduct the dirt weight. 1 lb for dirt. 19 lbs at 50c a lb. = $9.50 now 20 lbs at 40c a lb= $8... 9.50-8= 1.50 difference. How long does it take to fully clean 20 lbs? 20 lbs of breakage yields approx 14 lbs of clean alum. Breakage at 16c lbs 3.20$. 14lb clean alum~ 7$ dirty~5.60$. (Clean it, but don't cleeeean it) some PCs will be clean some with have dirt. Don't get anal over every little pc.
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