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Evaporator Cleaning

Sodium Bisulfate is not considered a hazardous material by the US DOT, unlike sulfamic acid and liquid mineral acids.

Sodium Bisulfate is a dry granular product which is non-fuming, non-flammable and non-hazardous. Its price is approximately the same as sulfamic acid.

NFPA Ratings

Sulfamic Acid Sodium Bisulfate

Made Domestically

Jones-Hamilton produces sodium bisulfate in the United States. We also offer technical support and service to the end-users of our product.

Sulfamic Acid is produced outside North America and imported.

Effective in Boiler/Evaporator Cleanouts

Calcium scales such as calcium sulfate and calcium carbonate are insoluble in water. Each are soluble in acidic solutions. Calcium scale can be removed with an acid wash using a 5-15% solution of sodium bisulfate. Scale is removed in a speed and manner similar to sulfamic acid.

Stable and Odorless

Under working conditions, sulfamic acid solutions remain stable, however at elevated temperatures, sulfamic acid can decompose to ammonia and sulfuric acid. Under working conditions and temperatures up to the boiling point, sodium bisulfate solutions remain stable.

Less Corrosive

Solutions of sodium bisulfate are less corrosive than sulfamic acid, and retain excellent scale removing efficiency. Solutions of sodium bisulfate may be used on stainless steel (304 or 316 up to boiling temperatures) without corrosion inhibitors, while typical industrial inhibitors (Rodine 31A or 103) at low concentrations, 0.05% and 0.50% respectively, can be used in mild steel applications. Comparable inhibitors for sulfamic acid require higher concentrations for adequate protection.

Won't Chelate

Sodium bisulfate does not chelate as sulfamic acid may, therefore, metal redepositing is not an issue with sodium bisulfate.

A Proven History of Use

Sodium bisulfate has decades of use as a cleaning compound in the metal finishing and printed circuit board industries. Jones-Hamilton Co. is the current domestic producer.

Technical Information

Sodium Bisulfate Sulfamic Acid
Formula NaHSO4 H2NSO3H
M.W. 120 97.1
Melting Point 350°F 400°F (decomposes)
Density 1.33 g/cc 1.25 g/cc
pH of 1% solutions* 1.61 1.18
pKa 1.99 1.00
Solubility 30% at 50°F 10% at 50°F
DOT Classification None Class 8 Corrosive Solid

*Approximate value in distilled water

Calcium Scale Removal

Calcium scales such as calcium sulfate and calcium carbonate are insoluble in water. However, both are soluble in a Sodium Bisulfate solution. Calcium scale can be removed with an acid wash using a 5-15% solution of Sodium Bisulfate (SBS). SBS can also be used during a shut down to remove scale by recirculating it throughout areas of the process where needed. The concentration of SBS solutions and the recirculation time depend upon the amount of scale that needs to be removed. The following chart shows (by weight) the theoretical amount of SBS required to remove one pound of calcium scale.

SBS Recommended for Calcium Scale Removal

To remove 1 lb. Calcium Lbs. SBS Recommended
Calcium Sulfate 0.95 lb.
Calcium Carbonate 2.5 lbs.

For product availability and pricing, contact Jones-Hamilton Co. by phone at 888-858-4425 or by email at This email address is being protected from spambots. You need JavaScript enabled to view it. .

Corrosion Resistance Data

Sodium bisulfate is approved and recommended to clean 304 and 316 stainless steel. Use a 10% solution of Sodium Bisulfate from 70°F up to boiling.*

*Damascus Bishop Tube Company