Methyl Orange, C.I. 13025

Version 1Last reviewed 25 February 2026Catalogue: C118, C1181, C1185

1. Identification

Product Identifiers

Product Name: Methyl Orange, C.I. 13025
Other Names: 4?[4?(Dimethylamino)phenylazo]benzenesulfonic acid sodium salt, Acid Orange 52, Helianthin, Orange III
Product Number(s): C118, C1181, C1185
CAS Number: 547-58-0

Recommended use of the chemical and restriction on use

Laboratory chemicals.

Company Details

ProSciTech Pty Ltd
11 Carlton Street
KIRWAN QLD 4817
Australia
(07) 4773 9444
pst@proscitech.com
proscitech.com.au

Emergency Contact Details

ProSciTech Pty Ltd
11 Carlton Street
KIRWAN QLD 4817
Australia
(07) 4773 9444
pst@proscitech.com
proscitech.com.au

2. Hazards Identification

Classification of the substance or mixture

Acute toxicity, Oral (Category 2)

Label Elements

Signal Words: None
Hazard Statement(s): H301: Toxic if swallowed.
Precautionary Statement(s): P264: Wash skin thoroughly after handling
P270: Do not drink, eat, smoke, when using this product.
P405: Store locked up.
P330: Rinse mouth
P301 ± P310: If Swallowed: Immediately Call Poison Center or doctor/physician
P321: Specific treatment (see supplemental first aid instructions)
P501: Dispose of contents/container to an approved waste disposal plant.

Human Health

Inhalation: Harmful by inhalation.
Ingestion: Harmful if swallowed.
Eyes: Risk of serious damage to eyes.
Skin: Harmful in contact with skin.

3. Composition / Information on Ingredients

Name	CAS No.	Content (w/w)	Classification
Sodium 4?(4-dimethylaminophenylazo)benzenesulphonate	547-58-0	100%	?

4. First Aid Measures

Ingestion: Do not induce vomiting without medical advice. Rinse with water. Consult physician.
Inhalation: Move to fresh air. Consult a physician.
Skin Contact: Rinse with plenty of soap & water and seek medical advice.
Eye Contact: Rinse immediately with plenty of water and seek medical advice.
Other Information: Treat symptomatically and supportively.

5. Firefighting Measures

Suitable extinguishing equipment

Fire: Use water spray, dry chemical, carbon dioxide, or appropriate foam.
Large Fire: Use water spray, dry chemical, carbon dioxide, or appropriate foam.
HAZCHEM: Not available.

Special protective equipment and precautions for fire fighters

As in any fire, wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Vapors may be heavier than air. They can spread along the ground and collect in low or confined areas. Special Hazards: Carbon, nitrogen, sulphur & sodium oxides.

6. Accidental Release Measures

Personal precautions, protective equipment and emergency procedures: No further information available.
Methods and materials for containment and clean up: Clean up spills immediately, observing precautions in the Protective Equipment Section. Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal. Avoid generating dusty conditions. Provide ventilation.

7. Handling and Storage

Precautions for safe handling: Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Avoid contact with skin and eyes. Keep container tightly closed. Do not ingest or inhale.
Conditions for safe storage: Store in a cool, dry, well-ventilated area away from incompatible substances. Keep containers tightly closed.

8. Exposure Controls / Personal Protection

Exposure Standards

Engineering controls: Use adequate ventilation to keep airborne concentrations low.

Personal protective equipment

Eye and face protection: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166.
Skin protection: Wear appropriate protective gloves to prevent skin exposure. 0.11mm thick nitrile.
Body protection: Wear appropriate protective clothing to prevent skin exposure.
Respiratory protection: A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirators use.

9. Physical and Chemical Properties

General information

Appearance: Solid. Orange.
Odour: Odourless.
pH: Not available.
Vapour Pressure: Negligible.
Density: No further information available.
Boiling Point: No further information available.
Melting Point: No further information available.
Solubility: No further information available.
Specific Gravity of Density: No further information available.
Flash Point: No further information available.
Flammable (Explosive) Limits: No further information available.
Ignition Temperature: No further information available.
Formula: No further information available.

10. Stability and Reactivity

Reactivity: No further information available.
Chemical stability: Stable under normal temperatures and pressures.
Possibility of hazardous reactions: See section 5
Conditions to avoid: Incompatible materials, excess heat.
Incompatible materials: Strong oxidising agents.

11. Toxicological Information

Acute effects: No further information available.
Eye contact: No further information available.
Skin contact: No further information available.
Ingestion: No further information available.
Inhalation: No further information available.
Toxicity and irritation: RTECS#: DB6327000 LD50/LC50: Oral, rat: LD50 = 60 mg/kg;
Carcinogenicity: CAS# 547-58-0: Not listed by ACGIH, IARC, NIOSH, NTP, or OSHA. Mutagenicity: Histidine reversion

12. Ecological Information

Ecotoxicity: No further information available.
Persistence and degradability: No further information available.
Bioaccumulative potential: No further information available.
Other adverse effects: No further relevant information available.

13. Disposal Considerations

General information

Chemical waste generators must determine whether a discarded chemical is classified as a hazardous waste. US EPA guidelines for the classification determination are listed in 40 CFR Parts 261.3. Additionally, waste generators must consult state and local hazardous waste regulations to ensure complete and accurate classification. RCRA P-Series: None listed. RCRA U-Series: None listed.

14. Transport Information

ADG label required

HAZCHEM: Not available.
UN Number: UN3143
Proper shipping name: Dye, solid, toxic, n.o.s. (Sodium 4?(4-dimethylaminophenylazo)benzenesulphonate)
Transport hazard class: 6
Packing group: PG III
Environmental hazard: Not regulated.
Special precautions for users: No further information available.
Additional information: ERG 151

15. Regulatory Information

Poisons Schedule Number: No further information available.
Other Information: No further information available.

16. Other Information

SDS preparation date: 25 February 2026
Comments: This information is based on our present knowledge. However, this shall not constitute a guarantee for any specific product features and shall not establish a legally valid contractual relationship.