99.9% Pure Fine Granular Powder Boric Acid Half Pound 1/2 Lbs Create Your Own Solution 99.9% Pure Boric Acid in fine granular powder form available now from Florida Laboratories Inc. This formula consists of very small grains of white colorless grains also known as orthoboric acid. It is a naturally occurring compound of boron oxygen and hydrogen. Boric Acid is also a great fire retardant and offers great thermal protection. Boric acid is also known as hydrogen borate boracic acid orthoboric acid and acidum boricum.