Section 211.170 - Use of proprietary specifications or standardsA justification and approval is required to use proprietary specifications and standards-
(1) When using sealed bidding or negotiated acquisition procedures (see 206.302-1(S-70) for justification requirements); or(2) When using the simplified procedures for certain commercial products or commercial services at FAR 13.5 (see 213.501(a)(ii) for justification requirements).84 FR 25192, May 31, 2019, as amended at 88 FR 6581, Jan. 31, 2023 84 FR 25192, 5/31/2019; as amended at 88 FR 6581, 1/31/2023