Cresol Purple - Material Safety Data Sheet (MSDS)

Identification

Product Name: Cresol Purple
Chemical Name: o-Cresolsulfonphthalein
Synonyms: Cresol Red, Cresolsulfonephthalein
CAS Number: 62625-29-0
Recommended Uses: Laboratory reagent, pH indicator
Supplier: Details available on the supplier label or safety documentation
Emergency Contact: Company-specific emergency numbers and local poison control centers should be referenced during incidents

Hazard Identification

Classification: Not labeled as a hazardous substance under GHS; certain reactions can create irritant conditions
Routes of Exposure: Inhalation, skin contact, eye contact, ingestion
Hazard Statements: May cause irritation to skin, eyes, and respiratory tract; contact with large quantities or prolonged exposure increases risk
Precautionary Statements: Avoid breathing dust; use protective equipment; wash exposed skin thoroughly after handling material
Signal Word: Not classified under GHS with specific danger or warning for small laboratory use, but exercise caution
Symptoms: Redness, discomfort, coughing, gastrointestinal upset in severe cases
Other Hazards: No evidence of carcinogenicity according to available data; chronic exposure data is limited

Composition / Information on Ingredients

Cresol Purple Content: >98% pure, may contain trace impurities
Chemical Formula: C21H18O5S
Molecular Weight: 382.43 g/mol
Ingredient Disclosure: No known toxic impurities present above disclosure limits

First Aid Measures

Inhalation: Move to fresh air promptly; seek medical advice if breathing difficulties persist
Skin Contact: Remove contaminated clothing; rinse affected area with soap and water for several minutes
Eye Contact: Rinse eyes cautiously with water for several minutes; remove contact lenses if possible; continue rinsing
Ingestion: Rinse mouth; seek medical attention if feeling unwell; do not induce vomiting unless directed by medical personnel
Most Important Symptoms: Mild to moderate irritation or redness; persistent symptoms require doctor evaluation
Medical Attention: Show safety data sheet or label to health professionals

Fire-Fighting Measures

Suitable Extinguishing Media: Water mist, CO₂, dry chemical, foam
Unsuitable Media: Avoid direct streams of water, which could spread powder
Specific Hazards: Burning may produce irritating fumes, including carbon oxides and sulfur oxides
Protective Equipment: Wear self-contained breathing apparatus and full protective gear in confined fires
Special Procedures: Control runoff to prevent contamination of waterways; ventilate area after extinguishing flames

Accidental Release Measures

Personal Precautions: Use proper personal protection including gloves, lab coat, eye protection, and dust mask if needed
Environmental Precautions: Avoid discharge into drains, water courses, or soil
Clean-up Methods: Sweep up material carefully; place in sealable, labeled waste container; ventilate area thoroughly after cleanup
Decontamination: Wash spill area with water and mild detergent; prevent dust formation during cleanup

Handling and Storage

Handling: Avoid contact with skin, eyes, and clothing; minimize dust generation and accumulation; use in a well-ventilated environment
Hygiene Practices: Wash hands and exposed skin before eating, drinking, or smoking after handling...contaminated clothing should not be reused until properly cleaned
Storage Conditions: Store in tightly closed containers; keep in a cool, dry, ventilated area; avoid direct sunlight and sources of ignition or excessive heat
Incompatible Materials: Keep away from strong oxidizers and acids
Storage Class: General chemical storage according to institutional guidelines

Exposure Controls and Personal Protection

Engineering Controls: Use fume hood or adequate ventilation to keep airborne concentrations low
Respiratory Protection: Wear approved dust mask or respirator if powder or dust is generated during use
Skin Protection: Nitrile gloves recommended due to the chemical’s potential to cause irritation; inspect gloves before use and discard damaged ones
Eye Protection: Chemical safety goggles with side shields minimize risk of contact
Body Protection: Laboratory coat or apron prevents contact with street clothing or exposed skin
Environmental Control: Keep workplace clean; prevent material releases to the environment

Physical and Chemical Properties

Appearance: Purple to reddish powder or crystals
Odor: Odorless or faint organic scent
pH: 3.4 – 8.8 (indicator range in solution)
Melting Point: 220 °C (428 °F) with decomposition
Boiling Point: Not applicable (decomposes)
Flash Point: Not flammable under normal conditions
Solubility: Slightly soluble in water, freely soluble in alcohol and other organic solvents
Vapor Pressure: Not available or negligible at ambient temperature
Density: Approximately 1.4 g/cm³
Partition Coefficient: Not determined
Other Properties: Forms fine dust when handled as a powder; stable in dry, sealed packaging

Stability and Reactivity

Chemical Stability: Stable under normal temperatures and recommended storage conditions
Reactivity: Shows low reactivity under ambient laboratory conditions
Conditions to Avoid: Excessive humidity, direct sunlight, strong oxidizers or acids
Hazardous Decomposition: May release carbon oxides and sulfur oxides on decomposition above melting temperature
Polymerization: Not expected to occur

Toxicological Information

Acute Effects: Dust can cause irritation to eyes, skin, and upper respiratory tract; ingestion in significant amounts could upset stomach
Chronic Effects: No evidence for mutagenicity, carcinogenicity, or reproductive toxicity based on current research
Sensitization: No known sensitization reactions reported in standard laboratory use
LD50 Values: Not established for this compound according to publicly available sources, but not known to be acutely toxic
Medical Conditions Aggravated by Exposure: Pre-existing allergies or skin sensitivities may increase response severity

Ecological Information

Toxicity to Aquatic Life: Expected to be low but not fully tested; do not allow to enter drains or natural waters
Persistence and Degradability: Degrades slowly in the environment through chemical or biological processes
Bioaccumulative Potential: No significant bioaccumulation is anticipated due to limited solubility and rapid degradation
Mobility: Low mobility in soil and water; binds to particles and organic matter
Other Adverse Effects: No known significant effects or hazards under recommended disposal and use

Disposal Considerations

Waste Disposal: Dispose as hazardous laboratory chemical waste according to local, regional, and national regulations; incineration in authorized facilities preferred
Contaminated Packaging: Empty packaging should be treated and disposed of in the same way as unused chemical
Waste Codes: Follow guidelines provided by authorities for laboratory waste or unlisted hazardous chemicals
Precautions for Disposal: Avoid release to environment; do not mix with incompatible wastes

Transport Information

UN Number: Not regulated for transport under major international guidelines for laboratory quantities
Transport Hazard Class: Not assigned under standard court systems
Packing Group: Not classified for transport packing group
Proper Shipping Name: Cresol Purple (not restricted in small laboratory container sizes)
Special Precautions: Package securely to prevent spills; transport in compliance with institutional and regional chemical transport policies
Environmental Hazards: Not expected under normal handling and shipping for laboratory supply

Regulatory Information

TSCA Inventory: Listed in the United States Toxic Substances Control Act Inventory
OSHA: Not regulated as a hazardous material under the OSHA Hazard Communication Standard
REACH Registration: Subject to European Union REACH obligations for chemical supply; check with suppliers regarding registration status for larger scale use
SARA Title III: Not listed under Section 302, 304, or 313 Toxic Release Inventory
California Prop 65: Not listed as a chemical known to cause cancer or reproductive harm
Other: Consult national, regional, and local regulations governing laboratory or industrial chemical use and waste