Congo Red
- CAS Number
- 573-58-0
- HSN Code
- 38229090
- Molecular Formula
- C32H22N6Na2O6S2
- Catalogue Number
- AL00529
- Purity
- > 95%
- Molecular Weight
- 696.84 g/mol
Complies with : IP | BP | USP | EP | ACS
ISO 9001
ISO 14001
GMP
COA with every batch
Key Properties
Congo red indicator solution is a ready-made preparation of the dye, saving the step of dissolving the powder. It is commonly used as a pH indicator and for staining amyloid in histological applications.
Also known as Congo red dye, Direct Red 28.
- Catalogue No.
- AL00529
- CAS Number
- 573-58-0
- Molecular Formula
- C32H22N6Na2O6S2
- Molecular Weight
- 696.84 g/mol
- HSN Code
- 38229090
- Grade
- Ready-to-use indicator solution
- Product Form
- Mixture
Dark red liquid with a density of 0.995 g/mL. The solution is stable and has a pH range of approximately 3.0 to 5.0 when used as an indicator.
- Appearance
- Dark red liquid
- Shelf Life
- 12 months
- Packaging
- Available in 100 mL and 500 mL bottles
- Storage
- Store in a cool, dry place away from light.
1.1 — Product identifier
- Chemical Name
- Congo Red
- Catalogue No.
- AL00529
- Product form
- Mixture
- CAS Number
- 573-58-0
- EC Number
- 209-406-4
- Grade
- Ready-to-use indicator solution
- EC Index Number
- 611-007-00-5
- Chemical Formula
- C32H22N6Na2O6S2
- HSN Code
- 38229090
- Synonyms
- Congo red dye, Direct Red 28
1.2 — Relevant identified uses of the substance or mixture and uses advised against
- Use of the substance/mixture
- pH indicator and histological stain
- 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
- May cause skin and eye irritation.
3.1 — Substance
- Name
- Congo Red
- CAS No.
- 573-58-0
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 soap and water. If irritation occurs, seek medical attention.
- First-aid measures after eye contact
- Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. If irritation persists, seek medical attention.
- First-aid measures after ingestion
- Rinse mouth. Do not induce vomiting. Seek medical attention if symptoms occur.
4.2 — Most important symptoms and effects, both acute and delayed
- Symptoms relating to use
- Irritation of skin and eyes, respiratory tract irritation.
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
- May emit toxic fumes under fire conditions.
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. Clean up spills immediately to prevent slipping hazards.
6.4 — Reference to other sections
- Reference
- Not specified
7.1 — Precautions for safe handling
- Precautions for safe handling
- Avoid contact with skin and eyes. Use in a well-ventilated area.
- 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.
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 appropriate respiratory protection if ventilation is inadequate.
9.1 — Information on basic physical and chemical properties
- Physical state
- Liquid
- Colour
- Dark red
- Odour
- Slightly aromatic
- Odour threshold
- No data available
- pH value
- 3.0 - 5.0
- Relative evaporation rate (butylacetate=1)
- No data available
- Melting point
- No data available
- Freezing point
- No data available
- Boiling point
- No data available
- Flash point
- No data available
- Auto-ignition temperature
- No data available
- Decomposition temperature
- No data available
- Flammability (solid, gas)
- Not flammable
- Vapour pressure
- No data available
- Relative vapour density at 20°C
- No data available
- Density
- 0.995 g/mL
- Solubility
- Soluble in water
- Log Pow
- No data available
- Viscosity, kinematic
- No data available
- Viscosity, dynamic
- No data available
- Explosive properties
- Not explosive
- Oxidising properties
- Not oxidising
- Explosive limits
- No data available
10.1 — Reactivity
- Reactivity
- Stable under normal conditions.
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 oxidizing agents.
10.6 — Hazardous decomposition products
- Hazardous decomposition products
- Not specified
11.1 — Information on toxicological effects
- Acute toxicity
- Low toxicity; LD50 (oral, rat) > 2000 mg/kg.
- Skin corrosion/irritation
- May cause mild irritation.
- Serious eye damage/irritation
- May cause irritation.
- Respiratory or skin sensitisation
- Not a sensitizer.
- Germ cell mutagenicity
- Not classified
- Carcinogenicity
- Not classified
- Specific target organ toxicity (single exposure)
- No data available.
- 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)
- Not applicable
- UN-No. (IMDG)
- Not applicable
- UN-No. (IATA)
- Not applicable
- UN-No. (ADN)
- Not applicable
- UN-No. (RID)
- Not applicable
14.2 — UN proper shipping name
- Proper Shipping Name (ADR)
- Not classified as dangerous goods
- Proper Shipping Name (IMDG)
- Not classified as dangerous goods
- Proper Shipping Name (IATA)
- Not classified as dangerous goods
- Proper Shipping Name (ADN)
- Not classified as dangerous goods
- Proper Shipping Name (RID)
- Not classified as dangerous goods
14.3 — Transport hazard class(es)
- Transport hazard class(es)
- Not applicable
14.4 — Packing group
- Packing group (ADR)
- Not applicable
- Packing group (IMDG)
- Not applicable
- Packing group (IATA)
- Not applicable
- Packing group (ADN)
- Not applicable
- Packing group (RID)
- Not applicable
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
Used directly as a pH indicator and amyloid histological stain. It is also utilized in various biochemical assays and research applications.
ISO 9001
ISO 14001
GMP
COA with every batch
- Batch Number
- AL-2026-AL00529
- Manufacturing Date
- September-2026
- Expiry Date
- September-2031
- Molecular Weight
- 696.84 g/mol
| Test | Standard | Observed |
|---|---|---|
| Description | Red colored solution | Red colored solution |
| PH 3.0-5.2 | Blue-Violet to Red orange | Blue-Violet to Red orange |
The above product complies with LR grade
Technical Data Sheet
| Grade | Assay/Purity | Melting/Boiling Point | Moisture/LOD | Residue on Ignition | Related Substances | Solubility |
|---|---|---|---|---|---|---|
| Ready-to-use indicator solution | > 95% | No data available | < 5% | < 1% | None detected | Soluble in water |
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