(a) Liquid hydrocarbon fuels with flash points lower than that of No. 2 diesel oil (125 [deg]F) shall not be used to prepare ammonium nitrate-fuel oil, except that diesel fuels with flash points no lower than 100 [deg]F may be used at ambient air temperatures below 45 [deg]F.
(b) Waste oil, including crankcase oil, shall not be used to prepare ammonium nitrate-fuel oil.