Reaxis®  E140

REAXIS® E140 (Potassium Stannate) is a Sn (IV)-based inorganic tin chemical. In addition to Sodium Stannate, common synonyms include Potassium Hexahydroxy Stannate and Potassium Stannate Trihydrate, as well as dipotassium, tin(4+), hexahydroxide. REAXIS® E140 contains approximately 40% tin. REAXIS® E140 is produced such that residual metal contaminates are controlled thus resulting in a high-purity end product. Alternative grades to the REAXIS® E140 include the higher purity REAXIS® E140P.  Alternatives to REAXIS® E140 would be the sodium grades REAXIS® E144 and REAXIS® E144P. Liquid grades of REAXIS® E140 can be produced upon request. REAXIS® E140 is present on a wide range of international regulatory lists, making it a great choice for global formula development. 

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Technical Information

  • Product Category Inorganic Tin

  • Chemical Name Potassium Stannate

  • CAS Number 12027-61-1

Typical Specifications

Parameter Range
Tin Content (%) 38.0 Min
Free KOH (%) 1.2 Max
Moisture (%) 2.5 Max
Insolubles (%) 0.1 Max

International Regulatory Listings

  • TSCA (US) Yes

  • DSL (Canada) Yes

  • REACH (EU) Yes

  • AICS (Australia) Yes

  • KECI (South Korea) Yes

  • ENCS (Japan) Yes

  • TCSI (Taiwan) Yes

  • NZloC (New Zealand) Yes

  • PICCS (The Philippines) Yes

  • NDSL (Canada) No

  • IECSC (China) No


REAXIS® E140 is used in a wide range of applications including glass, surface finishing, stabilization of hydrogen peroxide, and electrolyte additives for battery applications. In surface finishing applications, REAXIS® E140 is used as an alkaline electroplating additive in high-speed plating operations, given its ideal solubility as a plating agent. Related applications include the coating of automotive pistons and coin minting.  REAXIS® E140 is used as a stabilizer for hydrogen peroxide via the complexation of destabilizing residual metals thus resulting in extended storage stability. REAXIS® E140 can be used as an additive in electrolytes in metal-air batteries to minimize and control electrode corrosion/passivation/fouling.  


REAXIS® E140 has a reactivity characterized by its high tin content, species of tin as Sn (IV) present, and solubility. Like all inorganic tin products produced by Reaxis, the concentration of the active tin species, versus the inactive forms, is maximized. In terms of functionality, REAXIS® E140 acts as both a good chelating agent for a wide variety of metals and an efficient tin metal plating agent. 

Package & Storage


  • 25kg (55lb) Pails
  • 22.5kg (50lb) Pails


REAXIS® E140 should be stored in the original packaging.  The container should be closed tightly after each use to maximize shelf life. This product does have a tendency to occasionally clump. This occurrence does not affect the quality/reactivity of the product. 

Safety and Handling

Before use of Reaxis products please refer to the relevant Safety Data Sheet (SDS) for safety and toxicological data as well as for the information on proper transportation, storage, and use. SDSs are available by request via our web site, contacting your local representative, or emailing direct to

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This information is provided to the best of our knowledge but without obligation. Reaxis is not liable for any incorrect or missing information. This data sheet becomes invalid upon publication of a new version. Please contact us for the latest version.

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