ROYCE ASSOCIATES
A NEW JERSEY CORPORATION Telephone: (201)438-5200
35 Carlton Avenue Fax: (201)438-5207
East Rutherford, New Jersey 07073 Internet Address: www.ROYCEINTL.com
Technical Data Sheet
SODIUM FORMALDEHYDE SULFOXYLATE
APPEARANCE:
WHITE POWDER
CAS NO: 149-44-0
SPECIFICATIONS:
ASSAY: 98% MIN. (AS DIHYDRATE, BY IODINE TITRATION)
p.H. OF 2% SOLUTION: 9.5-10.5
ALKALINITY AS SODIUM
HYDROXIDE: ABOVE 0.3%
ALKALINITY AS Na2 Co3: 1-2.5%
SULFIDE CONTENT: NONE (TESTED BY LEAD ACETATE PAPER)
SOLUBILITY IN WATER: SHOULD READILY MAKE A 40% SOLUTION
LOSS ON DRYING: 20-24% (AZEOTROPIC DISTILLATION)
63OC
MELTING POINT:
Application:
Royce S.F.S. is primarily used as a redox catalyst in emulsion polymerization, where uniformity,
purity, and special quality control assures consistency, high yields, and good quality of the polymer
produced. It can be used in aqueous polymerization run at pH between 3.2 and 11. (for lower pH鈥檚,
inquire about other Royce catalysts).
Royce S.F.S. is a very efficient oxygen scavenger, and is used as such in some polymer applications.
Royce S.F.S. is a reductive bleach, alone or in combination with a chelating agent, it can be used to
brighten plastic.
Royce S.F.S. is used in the textile industry for discharge printing, and in color stripping of wool and
synthetics.
Royce S.F.S. is used a stabilizer and/or antioxidant, in industrial and pharmaceutical formulations.
Royce S.F.S. is approved as an indirect food additive in 21 CFR for a number of applications in paper
and rubber. Customers have to make certain that their specific application is covered.
CHEMISTRY:
The reducing power of Royce S.F.S. is increasing as the pH is lowered and/or as the temperature is
increased. If the pH us lowered below 4, good agitation should be used to prevent local acid
decomposition. Below pH 3.5 it is recommended to use the zinc stabilized products. For reductions at
elevated temperatures, as done in some textile applications, it is recommended not to go over 222OF.
Above pH 12, aqueous solutions should not be heated in the open, above 80oF, as they may release
some formaldehyde.
The stability of aqueous solution is decreasing with decreasing concentration, as the product ionizes.
Addition of caustic or salt will increase the stability. Moist powder or crystals, and over saturated
solutions are not stable. They rapidly develop a garlic like odor, and slowly lose activity.
In absence of water, Royce S.F.S. cannot be heated above 17O0F without danger of violent
decomposition.
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