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ASTM B117 salt purity
Q. The latest revision to ASTM B117 [affil link] calls for salt with a copper content of less than 0.3 ppm. I currently buy vacuum butter salt, but the vendor cannot certify the copper content, although his technical data sheet lists copper as <0.5 ppm max he can't certify to less than 0.3 ppm. Does anyone know of a grade of salt that meets the requirements of ASTM B117 [affil link] ?
Brad W. [last name deleted for privacy by Editor]2006
A. Morton Culinox 999 will meet the requirements.
Terry Tomt2006
RFQ: Hello.
I am also interested in ASTM B117
[affil link]
conformance. This will also affect ASTM G85
[affil link] and its Annex's plus others.
Does anyone know if Morton Salt has an outlet in UK.
Regards,
Ed. note: Sorry, this RFQ is outdated so private contact is no longer available, but public technical replies are still welcome! No public brand/source suggestions please ( huh? why?)
A. I would contact Kevin Smith at Auto Technology. He is the chairman of the ASTM review committee for that spec. I don't have exact contact info but call Auto Technology -- they can give you UK information most likely.
Terry TomtMay 23, 2012
A. Despite the fact that salt is a commonly occurring compound, pure sodium chloride (NaCl) is much more difficult to come by. Because of its hygroscopic nature, which tends to make salt coagulate and solidify, most granulated salt has anti-caking agents added. However, the addition of these agents is prohibited by most salt spray test standards.
For example, the world's most popular salt spray test standard; ASTM B117
[affil link]
, prohibits anti-caking agents, and also limits other impurities, as follows: total impurities < 0.3%, halides excluding chloride < 0.1%, copper < 0.3 ppm -- so the salt must be very pure indeed, with the limit for copper in particular set at an extremely low level. Other national and international test standards for corrosion testing are similarly demanding in their specifications.
November 29, 2012
A. Just to let all readers of this know Morton Culinox 999 High Purity Salt does not meet the specifications of ASTM B117
[affil link]
; it contains Sodium Ferrocyanide at 3 to 13 ppm. This is an anti-caking agent and if you read the ASTM method you will find that in B117 the salt to be used should not contain any anti-caking agents.
This explains the relatively low price of this salt compared to other salts that do actually meet the requirements of ASTM B117
[affil link]
.
A. According to Morton's product data sheet dated 4/11, the Culinox 999 product contains no additives. Their TFC 999 salt is prepared by adding a trace of Sodium Ferrocyanide (Yellow Prussiate of Soda) in the range of 3-13 ppm. TFC 999 and Culinox 999 are not the same product and Culinox 999 does meet the requirements of ASTM B117 [affil link] .
Christa LammersMay 24, 2013
October 24, 2014
RFQ: CAN YOU PLEASE GUIDE ME WHERE TO PROCURE SALT AS PER ASTM B117 [affil link] .
RAMESH CNEd. note: Sorry, this RFQ is outdated so private contact is no longer available, but public technical replies are still welcome! No public brand/source suggestions please ( huh? why?)
"MORTON® CULINOX® 999® SALT
Culinox 999 Salt is high purity, food grade granulated salt that is cubic in structure. Higher purity helps assure consistent saltiness intensity. Brine treatment, crystallizing technique, and post-crystallizing washing substantially reduces calcium, magnesium, iron, copper and other heavy metals, sulphate and carbonate impurities. The product contains no additives.
Certifications
Culinox 999 Salt complies with Food Chemicals Codex tolerances and federal cGMP standards...
Additives
Culinox 999 Salt contains no additives..."
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