ARMEX the Original Baking Soda Abrasive Sodium Bicarbonate (baking soda) abrasive blasting originated back in the 1980s during the restoration of the Statue of Liberty. During the planning of the project, Church & Dwight Co., Inc. maker of ARM & HAMMER baking soda was contacted by the engineers looking for a way to remove the final two interior coating layers without damaging Lady Libertys delicate copper skin. Through trial and error the engineers tested many different blasting abrasives and discovered that Sodium Bicarbonate had extraordinary cleaning and coating removal properties while not causing any surface damage. Following this success, Church & Dwight Co., Inc. launched the first Sodium Bicarbonate blasting abrasive, ARMEX. Not All Sodium Bicarbonates are the Same ARMEX formulations are unique and distinct from other Sodium Bicarbonate blasting abrasives. Sodium Bicarbonate comes in different grades of material which affects product quality and consistency. ARMEX formulations are manufactured in a consistent process and controlled environment using the highest grade of Sodium Bicarbonate available. This is what makes ARMEX the most consistent and highest quality Sodium Bicarbonate on the market. ARMEX Sodium Bicarbonate comes in different granule sizes ranging from 70 to 270 microns. The micron size will determine the degree of aggressiveness of cleaning with 270 microns providing the highest/extreme level of cleaning and 70 microns for more light/delicate cleaning. An additional benefit of ARMEX products are flow aids and advance moisture control additives which will prevent vapor blast equipment from clogging. Sodium Bicarbonate is a natural desiccant and loves to absorb water. Without these flow aids and advance moisture control additives, traditional Sodium Bicarbonates would clog vapor blast equipment. In addition it helps to preserve ARMEX when stored in high moisture environments. When used in high moisture environments.