What is Stannous Chloride Dihydrate CAS 10025-69-1?

It is tin(II) chloride in the stable hydrated crystalline form, commonly written as SnCl2·2H2O. The product appears as white monoclinic crystals and contains divalent tin, which is the active reducing and plating form of tin.

Why should stannous chloride dihydrate be dissolved in an acidic solution?

Tin(II) chloride tends to hydrolyze in plain water, especially when diluted or heated, forming insoluble basic tin salts and a cloudy solution. Dissolving or diluting it in an acidic medium, typically with hydrochloric acid, helps keep the tin in solution and prevents premature hydrolysis.

What are the main electroplating and surface-treatment uses?

Stannous chloride dihydrate is used as a tin source in acidic tin electroplating baths and as a sensitizer for glass, plastic, and ABS substrates before metallization. It is also used in mirror silvering and in processes requiring a strong Sn2+ reducing agent.

Why is the Sn2+ content important?

Only divalent tin provides the intended reducing activity and tin deposition behavior; oxidation to Sn4+ reduces performance. Iodometric titration or an equivalent assay is used to confirm the active Sn2+ content and detect unwanted oxidation.

How should Tin(II) chloride dihydrate be stored?

Store it in tightly sealed, acid-resistant containers in a cool, dry area and minimize exposure to air and moisture. This helps limit oxidation and hydration changes that can reduce the available Sn2+ content over time.

Stannous Chloride Dihydrate CAS 10025-69-1

Stannous Chloride Dihydrate, defined by CAS 10025-69-1, is a white crystalline inorganic salt that functions as a potent reducing agent and a primary source of divalent tin in electrochemical and chemical synthesis environments. Known technically as Tin(II) chloride dihydrate, this compound operates through its high affinity for oxygen, making it an essential sensitizing agent for glass metallization and plastic plating processes. In large-scale textile manufacturing, this Tin protochloride derivative acts as a mordant for dyeing operations and a discharge agent in printing, while in organic chemistry, Stannous dichloride dihydrate is utilized in the Stephen reduction for the synthesis of aldehydes from nitriles. As a versatile Tin dichloride crystal, it is also integrated into pharmaceutical intermediates and specialized electroplating baths to ensure uniform metal deposition. We facilitate bulk supply for industrial synthesis lines and surface treatment facilities, providing customized specifications regarding purity levels and acidity to suit specific reaction kinetics. Our distribution model ensures competitive factory pricing for international procurement, with every shipment meticulously supported by updated MSDS, TDS, COA documentation.

CAS: 10025-69-1
Synonyms: Tin(II) chloride dihydrate, Tin protochloride, Stannous dichloride dihydrate, Tin dichloride crystal, Tin(2+) chloride dihydrate.
Einecs: 231-868-0
Molecular Formula: SnCl2 · 2H2O
Grade: Industrial Grade / Reagent Grade
Package: 25kg/drum or customized

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Product Description

1 Technical Data (Physicochemical Properties)

2 Applications

3 Storage & Quality Assurance

Technical Data (Physicochemical Properties)

Property	Industrial Standard Specification
Appearance	White monoclinic crystals
Assay (as SnCl₂ · 2H₂O)	≥ 98.0%
Tin (Sn²⁺) Content	≥ 52.0%
Melting Point	37.7 °C
Solubility	Soluble in water, ethanol, and acetone
Water Insoluble Matter	≤ 0.05%
Iron (Fe)	≤ 0.003%

Applications

Electroplating & Surface Treatment: Used as a sensitizer for silvering mirrors and as an electrolyte component in tin-plating baths for steel and electronic components.
Chemical Synthesis: Acts as a catalyst in organic reactions, specifically as a reducing agent for nitro groups and nitriles.
Textile Industry: Employed as a mordant in the dyeing of cochineal on wool and as a bleaching agent in specialized fabric treatments.

For related tin compounds used in chemical processing and surface-treatment work, see Tin(II) Oxalate and Sodium Stannate Trihydrate.

Storage & Quality Assurance

Stannous Chloride Dihydrate must be stored in tightly sealed, acid-resistant containers in a cool, dry warehouse. Our facility implements a double-titration method to verify the precise Sn²⁺ content, ensuring minimal oxidation. Each lot undergoes comprehensive performance testing in simulated neutral conditions to ensure the material meets international industrial benchmarks.

FAQ - Technical & Supply Chain

Q:
What is Stannous Chloride Dihydrate CAS 10025-69-1?

A: It is tin(II) chloride in the stable hydrated crystalline form, commonly written as SnCl2·2H2O. The product appears as white monoclinic crystals and contains divalent tin, which is the active reducing and plating form of tin.
Q:
Why should stannous chloride dihydrate be dissolved in an acidic solution?

A: Tin(II) chloride tends to hydrolyze in plain water, especially when diluted or heated, forming insoluble basic tin salts and a cloudy solution. Dissolving or diluting it in an acidic medium, typically with hydrochloric acid, helps keep the tin in solution and prevents premature hydrolysis.
Q:
What are the main electroplating and surface-treatment uses?

A: Stannous chloride dihydrate is used as a tin source in acidic tin electroplating baths and as a sensitizer for glass, plastic, and ABS substrates before metallization. It is also used in mirror silvering and in processes requiring a strong Sn2+ reducing agent.
Q:
Why is the Sn2+ content important?

A: Only divalent tin provides the intended reducing activity and tin deposition behavior; oxidation to Sn4+ reduces performance. Iodometric titration or an equivalent assay is used to confirm the active Sn2+ content and detect unwanted oxidation.
Q:
How should Tin(II) chloride dihydrate be stored?

A: Store it in tightly sealed, acid-resistant containers in a cool, dry area and minimize exposure to air and moisture. This helps limit oxidation and hydration changes that can reduce the available Sn2+ content over time.

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