The requirement
ISPM 15 Annex 1 sets minimum concentration-time products for MB over 24 hours, depending on the wood temperature, with the wood at no less than 10 °C. Bark must be removed before treatment, and the treatment does not apply to wood with a smallest cross-section over 20 cm.
The environmental note
ISPM 15 reminds countries of their duties under the Montreal Protocol on ozone-depleting substances and asks national authorities to promote alternatives.
On EPAL pallets
EPAL says methyl bromide treatment is prohibited for EPAL pallets. An EPAL-branded pallet with an MB mark is not a normal EPAL pallet. Our stamp decoder flags the combination.
In North America
Both 7 CFR 319.40-3 and CFIA D-98-08 name methyl bromide among accepted treatments, so an MB mark is not on its own a reason for refusal at the border.