Use
UN1571 Barium azide wetted with not ,50%
water, by mass, Hazard Class: 4.1; Labels: 4.1—Flammable
solid, 6.1—Poisonous materials. UN0224 Barium Azide dry
or wetted with ,50% water, by mass, Hazard Class: 1.1A;
Labels: 1.1A—Explosive (with a mass explosion hazard);
A—Substances which are expected to mass detonate very
soon after fire reaches them. Packing Group 1.