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 must contain a minimum of 60% woodfree paper. This paper type needs to 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. Less than 5% newspapers and packaging. SOP may include a small amount of groundwood computer printout and facsimile paper.