Sorted Office Paper (SOP) is paper typically generated by offices. The paper can be shredded or unshredded. It can be printed and may contain colored papers.
SOP needs to contain a minimum of 60% woodfree paper, be free of carbon, and principally free from carbonless copy paper (CCP) and no carbon required (NCR). SOP contains less than 10% unbleached fibers including manila envelopes and file covers as well as less than 5% newspapers and packaging. SOP may also include a small amount of groundwood computer printout and facsimile paper.