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Chemical Name: Diphenyl Sulfone
Synonyms: Benzene, 1,1′-sulfonylbis-; Diphenyl sulphone
Chemical Formula: C12H10O2S
CAS Number: 127-63-9
Common Appearance: Often a colorless or white crystalline powder
Odor: Little to none detected in standard lab or industrial environments
Common Uses: Found in high-performance polymers, electronics, and specialty coatings. Chemists often reach for it in synthesis, but it’s not showing up in your household cleaning aisles.
Physical Hazards: Not highly flammable; most users think less about fire and more about chronic exposures
Health Hazards: Irritation possible with prolonged skin or eye contact; dust can trigger coughing or mild respiratory irritation
Chronic Effects: Animal studies suggest risk of liver or kidney changes with long-term frequent exposure to high concentrations; not a confirmed human carcinogen
Environmental Hazards: Some potential for long-term aquatic toxicity if large quantities enter waterways; doesn't break down easily in soil
Main Component: Diphenyl Sulfone (over 99% purity in most cases)
Residuals/Impurities: Traces of other aromatic sulfones sometimes occur in technical grades, rarely above 1%
Eye Contact: Flush eyes with water for several minutes, holding lids open; persistent pain calls for medical advice
Skin Contact: Wash off with water and soap; remove contaminated clothing
Inhalation: Move to fresh air if dust is breathed in; seek help if cough or shortness of breath stays
Ingestion: Rinse mouth with water; medical attention needed if swallowed in a significant amount, but accidental ingestion rarely leads to acute symptoms
Extinguishing Media: Water spray, foam, dry powder work for small fires
Combustion: Will not catch fire easily; if burned, can release nasty fumes—sulfur oxides among them
Special Equipment: Firefighters dealing with bulk quantities should use breathing protection if toxic smoke builds up
Unique Hazards: Avoid breathing dust and hot fumes generated in warehouse fires, where multiple chemicals mix
Personal Precautions: Standard dust mask and gloves work for clean-ups; keep unnecessary people out
Spill Cleanup: Gather up with a dustpan—avoid raising a cloud
Environmental Precautions: Keep out of drains and surface waterways, as the substance lingers in aquatic sediments
Disposal of Spills: Transfer collected waste to an approved container for hazardous waste if local law demands
Handling: Work in a well-ventilated spot, and keep protective gloves or goggles handy
Hygiene Practices: Do not eat or drink near where powders are measured; wash hands before breaks
Storage: Store in closed containers, dry and away from sunlight; avoid contact with strong oxidizers, as this can set off unwanted reactions
Exposure Limits: Not assigned a strict workplace exposure limit in most countries, but minimizing dust is still the norm
Ventilation: Basic local exhaust at mixing or transfer points
Personal Protection: Dust mask (N95 or better), chemical-resistant gloves, and goggles work well
Other Controls: Regular cleaning of workspaces keeps dust from building up
Appearance: White or off-white powder
Odor: Faint to none
Melting Point: Around 125°C
Boiling Point: 379°C, high compared to many common lab solvents
Solubility: Does not dissolve in water, but mixes well with organic solvents
Density: About 1.25 g/cm³
Vapor Pressure: Negligible at room temperature
Flash Point: Above 200°C, so ignition during daily use is rare to nonexistent
Chemical Stability: Stable at room temps, doesn’t break down easily
Reactive Materials: Avoid mixing with strong oxidizers and acids
Hazardous Decomposition: May form sulfur oxides, carbon oxides when burned
Polymerization: Not expected, so runaway reactions are out of the picture under normal conditions
Acute Toxicity: Generally low, though large doses could stress liver or kidneys
Skin Irritation: Prolonged contact might lead to redness or rash in sensitive people
Eye Irritation: Dust in eyes causes discomfort, as with most organic powders
Chronic Effects: Animal studies mark liver and kidney as target organs at high exposures; not expected to affect humans at low workplace levels
Carcinogenicity: Not listed by IARC or NTP; evidence in animal studies comes only at doses unlikely to be reached in day-to-day handling
Sensitization: Documented cases are rare
Persistence: Does not break down quickly in water or soil
Aquatic Toxicity: Chronic toxicity seen in fish at high concentrations; spills should never reach streams or ponds
Bioaccumulation: Studies suggest low to moderate potential
Other Concerns: Routine lab use carries little risk for broader environment; industrial users need better controls to keep powder out of waste streams
Preferred Methods: Small amounts can enter chemical waste streams in line with local regulations; never pour down household sinks
Industrial Quantities: Treat as hazardous, not regular trash; incinerate or bury at licensed facility where rules require
Environmental Compliance: Follow region-specific guidelines to minimize soil or water contamination
UN Number: Not classified as a dangerous good for most ground, sea, or air transport
Transport Precautions: Ship in tightly closed containers; label to alert handlers
Incidental Spills: Packing should withstand normal bumps and drops; accidental powder release handled with basic dust controls
International Listings: Included in major chemical inventories (US TSCA, EU REACH)
Hazard Communication: Requires safety labeling and documentation in most jurisdictions
Worker Protections: Most regulations focus on minimizing dust exposure and safe disposal; not singled out for extraordinary controls compared to many other specialty organic solids
