44 U.S.C. § 513

The Director of the Government Publishing Office shall compare every lot of paper and envelopes delivered by a contractor with the standard of quality fixed upon by the Joint Committee on Printing, and may not accept paper or envelopes which do not conform to it in every particular. A lot of delivered paper or envelopes which does not conform to the standard of quality may be accepted by the Committee at a discount that in its opinion is sufficient to protect the interests of the Government.