Fire-resistant hydraulic fluids and concentrates required to be employed in the hydraulic system of underground equipment in accordance with the provisions of S 75.1107-1 shall be considered suitable only if they have been produced under an approval, or any modification thereof, issued pursuant to part 35 pubchapter I of this chapter (Bureau of Mines Schedule 30), or any revision thereof.
053-4 Wyo. Code R. § 75.1107-2