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, also called tin(II) chloride dihydrate or tin protochloride, CAS 10025-69-1, is a white crystalline tin salt supplied for electroplating, chemical synthesis and surface treatment. Confirm the required grade and specification, then request a quotation with COA/TDS/SDS for bulk supply.

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

Stannous Chloride Dihydrate CAS 10025-69-1 is the hydrated crystalline form of tin(II) chloride, also known as tin protochloride, with the formula SnCl₂·2H₂O and EINECS 231-868-0.

Synonyms: Tin(II) chloride dihydrate; Tin protochloride; Stannous dichloride dihydrate; Tin dichloride crystal; Tin(2+) chloride dihydrate.

CAS: 10025-69-1.

Molecular formula: SnCl₂·2H₂O.

It appears as white monoclinic crystals.

It is soluble in water, ethanol and acetone.

Tin(II) chloride tends to hydrolyze in plain water, so a dilute acidic solution is usually preferred for use.

It is used as a tin source in acidic tin electroplating baths and as a sensitizer for glass, mirrors and plastics.

It also acts as a reducing agent for nitro groups and nitriles in organic synthesis, and as a mordant in textile dyeing.

The typical tin (Sn²⁺) content is about 52% or higher.

The melting point is about 37.7 °C.

The product may slowly oxidize or hydrolyze on exposure to air and moisture, so containers should stay tightly closed.

Store in tightly sealed, acid-resistant containers in a cool, dry, well-ventilated area.

Protect from moisture and keep containers closed when not in use.

Confirm appearance, assay, tin content, water-insoluble matter, iron and grade as required.

Use suitable eye and skin protection during handling, and wash skin contact with soap and water.

Confirm packaging with the requested quantity and destination requirements.

The page is an RFQ entry point and does not state stock, price, MOQ or fixed lead time.

For an RFQ, state the intended application, required grade, quantity, packaging, destination and document needs.

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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