40 CFR § 180.521 - Fumigants for grain-mill machinery; tolerances for residues.
(a) General. Fumigants may be safely used in or on grain-mill machinery in accordance with the following prescribed conditions:
(1) The fumigants consist of methyl bromide.
(3) Residues of inorganic bromides (calculated as Br) in milled fractions derived from cereal grain from all fumigation sources, including fumigation of grain-mill machinery, shall not exceed 125 parts per million.
(b) Section 18 emergency exemptions. [Reserved]
(c) Tolerances with regional registrations. [Reserved]
(d) Indirect or inadvertent residues. [Reserved]