The General Services Administration has authorized the use of this commercial item description, for all federal agencies.

1. SCOPE. This CID covers a powder form scale removing compound, hereafter referred to as “compound”, intended for removing scale deposits normally found in salt water evaporators, fresh water cooling and distribution systems, and water side scale found in heat transfer units. This compound can be used for removing scale deposits normally found in commercial dishwashing machines.

2. SALIENT CHARACTERISTICS.

2.1 Materials. Unless otherwise specified herein, materials shall be in accordance with the manufacturer’s material specifications. The compound shall be a clean, water-soluble, uniform free-flowing (lump-free) powder, and shall contain an anti-corrosion agent, an anti-caking agent, and a dye and dye stabilizer to indicate when the compound is spent during the descaling process. Metanil yellow is one acceptable dye.

2.1.1 Sulfamic acid. The compound shall contain not less than 90 percent (%) sulfamic acid by weight when determined in accordance with the USP XX titration method.

2.1.2 Hydrogen-ion concentration (pH). The compound shall have a pH of not more than 1.2 in a 1% solution in distilled water when determined in accordance with ASTM E70.

2.1.3 Excluded ingredients. The compound shall not contain sulfuric acid or organic solvents.

2.2 Corrosive effects on steel. The compound, in a 1% distilled aqueous solution, shall have a corrosive effect on steel of not more than 0.15% loss of mass on 2 inch by 2 inch