DFARS 211.170
Use of proprietary specifications or standards.
A 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 and commercial services at FAR 13.5 (see 213.501 (a)(ii) for justification requirements).
Source: acquisition.gov — DFARS
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