Silicotungstic Acid
- CAS Number
- 12027-43-9
- HSN Code
- 28111990
- Molecular Formula
- [H4(SiW3O10)4]·xH2O
- Catalogue Number
- AL01325
- Purity
- 99.5%
- Molecular Weight
- 2878.29 g/mol
Complies with : IP | BP | USP | EP | ACS
ISO 9001
ISO 14001
GMP
COA with every batch
Key Properties
Silicotungstic acid, also known as dodeca-tungstosilicic acid, is a heteropoly acid characterized by its complex structure and high molecular weight. It is primarily utilized in analytical chemistry as a precipitating agent and a visualization reagent in thin-layer chromatography (TLC). This compound is notable for its ability to form stable complexes with various organic compounds, making it an essential tool in the separation and identification of alkaloids and other substances. With a purity of 99.5% AR grade, it meets stringent quality standards for laboratory use, ensuring reliable results in analytical applications.
Also known as Dodeca-tungstosilicic acid.
- Catalogue No.
- AL01325
- CAS Number
- 12027-43-9
- Molecular Formula
- [H4(SiW3O10)4]·xH2O
- Molecular Weight
- 2878.29 g/mol
- HSN Code
- 28111990
- Grade
- AR (Analytical Reagent)
- Product Form
- Substance
Silicotungstic acid appears as a white to pale yellow crystalline solid. It is hygroscopic and soluble in water, which allows it to be easily incorporated into various aqueous solutions for analytical procedures. The compound has a high molecular weight of 2878.29 g/mol on an anhydrous basis, and its crystalline form contributes to its stability and effectiveness as a reagent. The melting point is not explicitly defined due to its complex structure, but it typically decomposes upon heating rather than melting. The density of silicotungstic acid is approximately 2.5 g/cm³, reflecting its heavy molecular composition.
- Appearance
- White to pale yellow crystalline solid
- Shelf Life
- Stable under recommended storage conditions
- Packaging
- Available in various sizes, typically in glass or plastic containers
- Storage
- Store in a cool, dry place away from incompatible materials.
1.1 — Product identifier
- Chemical Name
- Silicotungstic Acid
- Catalogue No.
- AL01325
- Product form
- Substance
- CAS Number
- 12027-43-9
- EC Number
- 235-028-0
- Grade
- AR
- EC Index Number
- Not applicable
- Chemical Formula
- [H4(SiW3O10)4]·xH2O
- HSN Code
- 28111990
- Synonyms
- Dodeca-tungstosilicic acid
1.2 — Relevant identified uses of the substance or mixture and uses advised against
- Use of the substance/mixture
- Analytical reagent
- Uses advised against
- Not specified
1.3 — Details of the supplier of the safety data sheet
- Company identification
- Address:- 102, B wing, Savgan Heights, RTO Lane,Andheri (W), Mumbai-400 053Maharashtra, India.
1.4 — Emergency Contact Details
- Phone / e-Mail
- Phone : +91 22 26317055 Mobile : +91 9820385757 e-mail : info@alphachemika.co.in
2.3 — Other hazards
- Other hazards
- Corrosive to metals
3.1 — Substance
- Name
- Silicotungstic Acid
- CAS No.
- 12027-43-9
4.1 — Description of first aid measures
- First-aid measures after inhalation
- Move to fresh air. If symptoms persist, seek medical attention.
- First-aid measures after skin contact
- Wash with plenty of soap and water. Seek medical attention if irritation develops.
- First-aid measures after eye contact
- Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing. Seek medical attention.
- First-aid measures after ingestion
- Rinse mouth. Do not induce vomiting. Seek medical attention immediately.
4.2 — Most important symptoms and effects, both acute and delayed
- Symptoms relating to use
- Corrosive effects may include irritation, redness, and burns to skin and eyes; respiratory irritation if inhaled.
4.3 — Indication of any immediate medical attention and special treatment needed
- General information
- Treat symptomatically. Show this safety data sheet to the treating physician.
5.1 — Extinguishing media
- Suitable extinguishing media
- Water spray, carbon dioxide, dry chemical powder, foam.
- Unsuitable extinguishing media
- Not specified
5.2 — Special hazards arising from the substance or mixture
- Special procedures
- Non-flammable, but may emit toxic fumes in a fire.
5.3 — Advice for firefighters
- Protection during firefighting
- Do not enter fire area without proper protective equipment, including respiratory protection.
6.1.1 — For non-emergency personnel
- Emergency procedures
- Contain spill and absorb with inert material. Dispose of in accordance with local regulations.
6.3 — Methods and material for containment and cleaning up
- Methods for cleaning up
- Use appropriate protective equipment. Collect and dispose of in accordance with local regulations.
6.4 — Reference to other sections
- Reference
- Not specified
7.1 — Precautions for safe handling
- Precautions for safe handling
- Use gloves and protective eyewear. Avoid contact with skin and eyes.
- Hygiene measures
- Wash hands and other exposed areas with mild soap and water before eating, drinking or smoking and when leaving work.
7.2 — Conditions for safe storage, including any incompatibilities
- Storage conditions
- Store in a cool, dry place, away from incompatible materials such as strong bases and reducing agents.
8.2 — Exposure controls
- Hand protection
- Protective gloves (e.g. nitrile rubber)
- Eye protection
- Chemical safety goggles or safety glasses
- Skin and body protection
- Wear suitable protective clothing
- Respiratory protection
- Use in a well-ventilated area. If exposure limits are exceeded, use appropriate respiratory protection.
9.1 — Information on basic physical and chemical properties
- Physical state
- Solid
- Colour
- White to pale yellow
- Odour
- Odourless
- Odour threshold
- Not applicable
- pH value
- Not applicable
- Relative evaporation rate (butylacetate=1)
- Not applicable
- Melting point
- Decomposes upon heating
- Freezing point
- Not applicable
- Boiling point
- Not applicable
- Flash point
- Not applicable
- Auto-ignition temperature
- Not applicable
- Decomposition temperature
- > 200 °C
- Flammability (solid, gas)
- Not flammable
- Vapour pressure
- Not applicable
- Relative vapour density at 20°C
- Not applicable
- Density
- ~2.5 g/cm³
- Solubility
- Soluble in water
- Log Pow
- Not applicable
- Viscosity, kinematic
- Not applicable
- Viscosity, dynamic
- Not applicable
- Explosive properties
- Not explosive
- Oxidising properties
- Not oxidizing
- Explosive limits
- Not applicable
10.1 — Reactivity
- Reactivity
- Stable under normal conditions; reacts with strong bases and reducing agents.
10.2 — Chemical stability
- Chemical stability
- Stable under recommended storage conditions.
10.3 — Possibility of hazardous reactions
- Possibility of hazardous reactions
- No dangerous reactions known under normal conditions of use.
10.4 — Conditions to avoid
- Conditions to avoid
- Avoid contact with incompatible materials and excessive heat.
10.5 — Incompatible materials
- Incompatible materials
- Strong bases, reducing agents
10.6 — Hazardous decomposition products
- Hazardous decomposition products
- Not specified
11.1 — Information on toxicological effects
- Acute toxicity
- Low toxicity; may cause irritation upon contact.
- Skin corrosion/irritation
- Causes skin irritation.
- Serious eye damage/irritation
- Causes serious eye irritation.
- Respiratory or skin sensitisation
- Not a sensitizer.
- Germ cell mutagenicity
- Not classified
- Carcinogenicity
- Not classified
- Specific target organ toxicity (single exposure)
- May cause respiratory irritation upon inhalation.
- Specific target organ toxicity (repeated exposure)
- Not classified
12.1 — Toxicity
- Toxicity information
- Not specified
12.2 — Persistence - degradability
- Persistence - degradability
- Not specified
12.3 — Bioaccumulative potential
- Bioaccumulative potential
- Not specified
12.4 — Mobility in soil
- Mobility in soil
- Not specified
12.6 — Other adverse effects
- Environmental precautions
- Not specified
13.1 — Waste treatment methods
- Additional Info
- Dispose of contents/container in accordance with local, regional, national and international regulations.
14.1 — UN number
- UN-No. (ADR)
- UN 3260
- UN-No. (IMDG)
- UN 3260
- UN-No. (IATA)
- UN 3260
- UN-No. (ADN)
- UN 3260
- UN-No. (RID)
- UN 3260
14.2 — UN proper shipping name
- Proper Shipping Name (ADR)
- Corrosive solid, acidic, organic, n.o.s.
- Proper Shipping Name (IMDG)
- Corrosive solid, acidic, organic, n.o.s.
- Proper Shipping Name (IATA)
- Corrosive solid, acidic, organic, n.o.s.
- Proper Shipping Name (ADN)
- Corrosive solid, acidic, organic, n.o.s.
- Proper Shipping Name (RID)
- Corrosive solid, acidic, organic, n.o.s.
14.3 — Transport hazard class(es)
- Transport hazard class(es)
- 8
14.4 — Packing group
- Packing group (ADR)
- III
- Packing group (IMDG)
- III
- Packing group (IATA)
- III
- Packing group (ADN)
- III
- Packing group (RID)
- III
14.5 — Environmental hazards
- Dangerous for the environment
- Not specified
- Marine pollutant
- Not specified
- Other information
- No supplementary information available
15.1 — Safety, health and environmental regulations/legislation specific for the substance or mixture
- 15.1.1 EU-Regulations
- Not specified
Silicotungstic acid is widely used in analytical chemistry, particularly as a precipitating reagent for alkaloids, which are often difficult to isolate and identify. It serves as a universal staining reagent in thin-layer chromatography (TLC), allowing for the visualization of various compounds on chromatographic plates. Additionally, it is employed in the preparation of catalysts and in the synthesis of other heteropoly acids. Its applications extend to the fields of pharmaceuticals, environmental analysis, and food safety testing, where precise identification and quantification of organic compounds are crucial.
ISO 9001
ISO 14001
GMP
COA with every batch
- Batch Number
- AL-2026-AL01325
- Manufacturing Date
- September-2026
- Expiry Date
- September-2031
- Molecular Weight
- 2878.29 g/mol
| Test | Standard | Observed |
|---|---|---|
| Description | Slightly yellow colored powder | Slightly yellow colored powder |
| Assay | (Min.) 99.5% | 99.79% |
| Chloride (Cl ) | <0.005% | <0.005% |
| Sulphate (SO4) | <0.005% | 0.004% |
| Nitrogen compound (N) | <0.002% | 0.001% |
| Heavy metals (as Pb) | <0.002% | <0.002% |
| Iron (Fe) | <0.001% | <0.001% |
| Potassium (K) | <0.02% | 0.0082% |
| Sodium (Na) | <0.02% | <0.02% |
| Loss on ignition at 750°C | <16.00% | 11.36% |
The above product complies with AR grade
Technical Data Sheet
| Grade | Assay/Purity | Melting/Boiling Point | Moisture/LOD | Residue on Ignition | Related Substances | Solubility |
|---|---|---|---|---|---|---|
| AR | 99.5% | Decomposes upon heating | < 1% | < 0.5% | None detected | Soluble in water |
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