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