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topic 57139

How to test for Anticaking Agent in Salt (ASTM B117)


May 10, 2011


I work at a surface treatment laboratory in an Aircraft industry. We've been using Broxetten salt for Salt Spray Test per ASTM B117 [affil. link to spec at Techstreet] . The problem is we can't get Certificate of Analysis from our salt supplier as a proof that their salt is free from Anticaking agent. So, I would be very grateful if anyone can give a clue on how to test for the presence and percentage of anticaking agent in Sodium Chloride (NaCl)?

Endang Sari
Laboratory Engineer - Bandung, West Java, Indonesia


July 14, 2011

The anticake agent is potassium ferricyanide and soluble ferrous iron salts form Prussian Blue with potassium ferricyanide. There are a number of test kits for ferricyanide on the web.

Leo Herrington
- Fort Walton Beach, Florida


First of two simultaneous responses -- July 19, 2011

I believe that sodium silicoaluminate is also used.

dave wichern
Dave Wichern
Consultant - The Bronx, New York


Second of two simultaneous responses -- July 20, 2011

If it is free flowing, it has anti-caking agent

sara michaeli
Sara Michaeli sara michaeli signature
chemical process supplier
Tel-Aviv, Israel


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