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Chemical Name: Disodium Phenyl Dibenzimidazole Tetrasulfonate
Synonyms: DPDT
CAS Number: 180898-37-7
Common Uses: Sunscreen formulations aimed at broad-spectrum UV protection
Physical Appearance: Off-white to yellowish powder or granules with a faint odor
Solubility: Readily dissolves in water, forms clear to slight yellow solutions
Odor: Minimal, not typically noticeable in prepared formulations
Main Hazards: Prolonged contact may cause mild skin or eye irritation; dust inhalation may cause respiratory tract discomfort
GHS Classification: Eye irritant; may cause transient discomfort to eyes
Signal Word: Warning
Prevention: Minimize generation and accumulation of dust
Environmental Risks: Excess release into waterways may affect aquatic organisms
Main Ingredient: Disodium Phenyl Dibenzimidazole Tetrasulfonate (greater than 90 percent by weight in most pure samples)
Impurities: Typically contains minor sodium sulfate and moisture; trace impurities from manufacturing are low and rarely influence safety
Molecular Formula: C24H14N6Na2O12S4
Molecular Weight: 734.64 g/mol
Inhalation: Remove from area of exposure; seek fresh air and consult a doctor if symptoms persist
Skin Exposure: Wash with plenty of soap and water; seek medical advice for irritation or rash
Eye Contact: Rinse cautiously with water for at least 15 minutes; get medical attention for persistent irritation
Ingestion: Rinse mouth; drink water; medical observation recommended if larger amounts swallowed
Symptoms to Watch: Redness, itching, coughing, or breathing difficulty
Suitable Extinguishing Media: Water spray, foam, dry chemical, or carbon dioxide
Special Hazards: Slight risk of hazardous fumes such as oxides of sulfur and nitrogen if heated strongly
Protective Equipment: Firefighters should wear self-contained breathing apparatus and protective gear
Combustion Products: Sulfur oxides, nitrogen oxides, carbon monoxide, carbon dioxide
Fire Behavior: Not considered highly flammable, but powders can disperse and combust under certain conditions
Personal Precautions: Avoid inhaling dust; use gloves and eye protection
Spill Cleanup: Collect spilled powder using a method that avoids dust generation; wipe surfaces with damp disposable towels
Environmental Considerations: Prevent entry into surface water or drains; collect spillage for safe disposal
Ventilation: Use local exhaust if dust present
Safe Handling: Handle with care to avoid dust formation and exposure to skin or eyes
Storage Conditions: Store in tightly closed containers in a cool, dry, well-ventilated area
Avoid: Sources of moisture and extreme heat; keep containers sealed when not in use
Incompatible Materials: Strong oxidizers
Engineering Controls: Use local exhaust or general ventilation to control airborne particles
Personal Protection: Protective gloves, chemical goggles, and lab coats recommended for bulk handling
Respiratory Protection: Respiratory mask in case of dust exposure above occupational limits
Hygiene Measures: Wash hands after handling; do not eat, drink, or smoke around raw material
Physical State: Powder or granules
Color: Off-white to pale yellow
Odor: Mild to none
pH (1% solution): Slightly acidic to neutral, commonly around 6 to 7.5
Melting Point: Decomposes before melting under conventional conditions
Boiling Point: Not applicable
Solubility in Water: Freely soluble
Vapor Pressure: Not significant
Chemical Stability: Remains stable under normal usage and storage conditions
Reactivity: Not especially reactive in solid or aqueous form
Conditions to Avoid: Prolonged exposure to moisture or high heat
Incompatible Materials: Strong acids and oxidizing agents
Decomposition Products: Toxic gases like sulfur oxides and nitrogen oxides possible on severe heating
Acute Toxicity: Low acute oral and dermal toxicity in animal testing
Skin Irritation: Generally mild, more likely with repeated or prolonged exposure
Eye Effects: May cause temporary discomfort; not classed as corrosive
Sensitization: Not a known skin sensitizer in typical concentrations
Chronic Effects: No evidence of carcinogenicity or mutagenicity based on present studies
Ecotoxicity: Limited data exists, but excessive discharges can harm aquatic life
Persistence and Degradability: Shows moderate persistence in aquatic environments and breaks down over weeks to months
Bioaccumulation Potential: Low, based on molecular structure and water solubility
Mobility in Soil: Moves with runoff due to high water solubility
Recommended Methods: Dispose of in accordance with local regulations, preferably via hazardous waste channels
Prevent Release: Avoid disposal in municipal drains or surface waters
Packaging Disposal: Clean packages before recycling or final disposal; remaining residues should be treated as waste
Transport Classification: Not regulated as a dangerous good for road, rail, or air in most jurisdictions
Packing Considerations: Ensure packages are secure, protected from moisture and not overloaded
Spillage During Transport: Notify authorities as required; clean up with protective gear
International Listings: Registered in major markets as an approved UV filter for cosmetic and skin-care use
Regulatory Status: Regulations vary by country; included in approved annexes for cosmetics in the European Union and several other regions
Restrictions: Maximum concentration limits often set for finished products; check local laws before manufacture or import
Worker Safety: Subject to general workplace safety and chemical handling rules
