Corrosion inhibition, tannin blocking and mold inhibition. Multifunctional and corrosion inhibitive pigment that contains no lead or chromate. Busan 11-M1 is the commercial form of barium metaborate mono hydrate. The product is a multi-functional pigment manufactured using a unique process to provide quality performance for the coatings customer. Busan 11‑M1 is ≤90% active calculated as BaB2O4•H2O. Busan 11‑M1 is the only EPA‑registered barium metaborate on the market today.