© 2026 Nanjing Finechem Holdings Co., Ltd,
All Right Reserved
Product Name: Phosphorus Pentoxide
Chemical Formula: P2O5
Synonyms: Diphosphorus pentoxide, Phosphoric anhydride
CAS Number: 1314-56-3
Recommended Use: Dehydrating agent in laboratories and various industries
Restrictions on Use: Only by trained professionals with proper ventilation
Manufacturer Contact: Emergency phone numbers and addresses provided by the supplier or relevant authority
Hazard Classification: Corrosive to metals, Acute toxicity (oral, inhalation), Causes severe skin burns and eye damage
Signal Word: Danger
Hazard Statements: Causes severe irritation and burns to eyes, skin, and mucous membranes; releases toxic fumes if exposed to water or moisture; dangerous if inhaled or swallowed
Pictograms: Corrosion, Exclamation, Health hazard
Precautionary Statements: Wear protective gear, avoid breathing dust or fumes, wash hands thoroughly after handling, store locked up
Chemical Name: Phosphorus pentoxide
Common Name: Diphosphorus pentoxide
Concentration: 99%-100% pure
Impurities: No significant hazardous impurities above regulatory thresholds
Other Identifiers: Inorganic compound, White crystalline solid with strong dehydrating properties
Inhalation: Move person to fresh air, keep at rest, seek immediate medical attention, provide oxygen if breathing is labored
Skin Contact: Remove contaminated clothes, flush skin with plenty of running water at least 15 minutes, seek medical help if irritation persists
Eye Contact: Rinse eyes with gentle stream of water for at least 15 minutes, lift upper and lower eyelids regularly, get medical attention urgently
Ingestion: Do not induce vomiting, rinse mouth cautiously with water, seek medical advice without delay
General Notes: Emergency personnel should understand risks and use protective equipment
Suitable Extinguishing Media: Dry chemical, carbon dioxide, do not use water as contact forms corrosive phosphoric acid
Specific Hazards: Reacts violently with water; releases dense, toxic, and corrosive phosphoric acid mist; fire may produce irritating and toxic fumes
Protective Equipment: Self-contained breathing apparatus, full protective suit
Special Procedures: Remove containers from fire area if safe, keep surrounding area cool with shielding, remain upwind to avoid exposure
Personal Precautions: Evacuate area, shut off ignition sources, ventilate space, wear chemical-resistant gloves, clothing, and goggles
Environmental Precautions: Prevent spill from entering watercourses and drains, report large releases to authorities
Containment Methods: Collect spilled material by sweeping up dry powder, avoid raising dust, use non-sparking tools
Cleanup Procedures: Place residues in suitable labeled containers for proper disposal, ventilate and wash spill zone after cleanup
Handling: Avoid generating dust, never add water directly, always work in a fume hood or well-ventilated area, wear protective equipment
Storage: Store in tightly closed corrosion-resistant containers, cool, dry, and well-ventilated place, segregate from water, acids, metals, and combustibles
Other Precautions: Inspect containers regularly for leaks, clearly label all storage vessels, train staff in emergency procedures and chemical safety
Occupational Exposure Limits: ACGIH TLV: 0.1 mg/m3 (TWA)
Engineering Controls: Use closed systems or local exhaust ventilation, safety shower and eyewash station within quick access
Respiratory Protection: Wear a NIOSH-approved full-face respirator when dust present
Skin Protection: Chemical-resistant gloves (rubber, neoprene), long-sleeved clothing and lab coat
Eye / Face Protection: Safety goggles with side shields and face shield
Hygiene Measures: Wash hands and face after handling, change contaminated clothing before re-use, routinely clean PPE
Appearance: White, crystalline solid, may be granular or powdery
Odor: Odorless
pH: Forms strong acid when dissolved in water
Melting Point: SubLimes at 360°C (no liquid phase under atmospheric pressure)
Boiling Point: Decomposes
Solubility: Reacts violently with water to form phosphoric acid
Density: 2.39 g/cm3
Vapor Pressure: Negligible at room temperature
Other Properties: Strong dehydrating power, hygroscopic, highly reactive
Chemical Stability: Stable in dry air, decomposes in presence of moisture
Incompatible Materials: Water, alcohols, strong bases, combustible materials, metalloids and most organic substances
Hazardous Decomposition Products: Phosphoric acid, phosphorus oxides
Conditions to Avoid: Contact with water, humid air, high temperatures, spills onto combustible surfaces
Reactivity Profile: Extremely reactive with water and organic material, releases large amounts of heat
Acute Toxicity: Toxic by inhalation, ingestion, and skin absorption; LD50 (oral, rat): 382 mg/kg
Corrosive Effects: Severe skin burns, eye damage, can lead to blindness or permanent tissue injury
Irritation: Persistent coughing, nasal irritation, lung edema possible after inhalation
Other Effects: Chronic exposure could cause dental erosion, respiratory tract issues, possible lung damage
Symptoms: Burning sensation, coughing, shortness of breath, delayed lung effects after exposure
Ecotoxicity: Harmful to aquatic life by drastically changing pH and causing phosphorous pollution
Persistence: Reacts to form phosphoric acid, persists in environment if large spills occur
Bioaccumulative Potential: Not expected to bioaccumulate due to rapid hydrolysis
Mobility in Soil: Rapidly reacts with moisture, binds with soil particles, contributing to eutrophication in waterways
Other Notes: Spill prevention and mitigation essential to avoid long-term damage to water systems
Waste Treatment Methods: Neutralize cautiously with dilute alkaline solution before disposal, collect in labeled corrosion-resistant container
Disposal Requirements: Dispose of through licensed hazardous waste contractor, comply with local, regional, and national regulations
Container Disposal: Triple rinse, puncture, and destroy empty containers in line with hazardous waste protocols
Do Not: Dump into drains, water courses, or general waste streams
UN Number: 1807
UN Proper Shipping Name: Phosphorus pentoxide
Transport Hazard Class: 8 (Corrosive substances)
Packing Group: I (highest danger classification)
Labeling Requirements: Corrosive, keep upright, protect from moisture
Special Transport Precautions: Store away from food, feedstuffs, and incompatible substances; keep containers dry and sealed
OSHA: Listed as hazardous material; workplace exposure standards apply
TSCA: Listed
EU Classification: Extremely corrosive, hazardous to environment
Other Applicable Laws: Subject to reporting and management under environmental, transportation, occupational safety rules
Labeling: Strict hazard communication and training mandated for all handlers and transporters
