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