USA PS-40, sorted white ledger
requirements: consists of uncoated, printed or unprinted sheets, shavings, fuillotined, books, and cuttings of white groundwood-free ledger, bond, writing paper, and all other papers which have a similar fiber and filler content.
this grade must be free of treated, coated, padded, or heavily printed stock.
prohibitive materials shall not exceed 0.5%. total outthrows shall not exceed 2%
whiteness>90%
moisture<10%
USA PS-12 (DSOCC)
might be repeat each month
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