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Chemical name: Hexamethylphosphoramide
Common names: HMPA
Molecular formula: C6H18N3OP
Appearance: Clear, colorless liquid
Odor: Ammonia-like smell, often sharp and unpleasant
Uses: Strong polar solvent in research, especially where separating polar compounds matters
Main risks: Probable human carcinogen, strong skin and respiratory irritant, toxic if inhaled or swallowed, potential to cause genetic defects and reproductive harm
Acute effects: Burning on skin contact, coughing and headaches on inhalation, eye stinging and watering
Chronic effects: Heightened cancer risk, fertility problems, possible organ toxicity to liver and kidneys from repeated exposure
OSHA status: Regulated due to cancer risk fears from lab studies on animals
Main component: Hexamethylphosphoramide (C6H18N3OP) in technical grade
Purity levels: Typically exceeds 97% in lab use—rarely greater than trace impurities present
Impurity sources: Trace amines, water, potential breakdown products if stored too long or at high temperatures
Inhalation: Move to clean air at once, seek medical help if coughing persists or dizziness occurs
Skin contact: Remove contaminated clothing, rinse skin under running water for at least 15 minutes, wash thoroughly with soap
Eye contact: Flush with water for no less than 15 minutes, keep eyelids open, seek medical advice quickly
Ingestion: Rinse mouth with water, no inducing vomiting due to strong toxicity, seek immediate medical care
Flammability: This solvent burns above a certain temperature, releasing fumes
Suitable extinguishers: Use water spray, dry powder, or foam, avoid direct stream as spreading may occur
Toxic gases: Smoke from fires can include carbon oxides, unique phosphorous and nitrogen oxides with heavy irritation
Protective tactics: Self-contained breathing equipment and full gear make sure responders don't inhale anything dangerous
Personal precautions: Respiratory protection and chemical gloves prevent skin and lung exposure
Spill cleanup: Keep people away, ventilate area, soak up with inert material like sand then collect in leak-proof, labeled containers
Avoid drains: Do not let solvents enter sewer systems or run-off into natural water—regulations come down hard on this
Decontamination: Wash spill area thoroughly with soap and water after cleanup, remove and launder contaminated clothing
Safe handling: Perform all work in well-ventilated lab hoods or with exhaust, wearing splash goggles and gloves
Storage: Keep in tightly sealed containers away from light and moisture; store away from acids, oxidizers, strong bases, or direct heat
Containment importance: Vapors escape, so double-bagging and vapor-proof storage cut down exposure risk
Label warnings: High visibility and strict access help prevent accidental misuse
Ventilation: Local exhaust or chemical fume hoods recommended for all transfers or manipulations
Personal protection: Impervious gloves (like nitrile), full-length lab coats, chemical splash goggles, sometimes full-face respirators if vapor risk rises
Exposure limits: Strict occupational limits have been put in place in many countries, often at sub-ppm levels due to cancer fears
Hygiene advice: Wash hands before eating; avoid touching face or eyes during lab work; change contaminated clothes
State: Liquid at room temperature
Boiling point: Around 233 °C
Melting point: Typically -5 °C
Density: Roughly 1.027 g/cm³
Solubility: Mixes easily with water and organic solvents
Vapor pressure: Low at room temperature, but still adequate to require sealed storage
Viscosity: Slightly higher than water
Odor threshold: Often detected at low concentrations, which can help with early warning of leaks
Chemical stability: Remains stable in the dark at normal temperatures, some breakdown under prolonged heat or light
Incompatible materials: Avoid strong acids, strong bases, oxidizers; can react violently or decompose into toxic fumes
Hazardous byproducts: Heating can create toxic chlorides, phosphates, or nitrogen oxides depending on contamination and fire
Polymerization: Unlikely under standard lab use but shouldn't be heated in sealed containers
Routes of exposure: Inhalation, skin absorption, ingestion
Short-term symptoms: Irritation of eyes, lungs, and skin; headaches and confusion if inhaled in large amounts
Long-term risk: Animal data show clear links to cancer and DNA mutation; reproductive risk with repeated or high exposure
Accepted wisdom: Limit even low-level exposure to minimum, given strong evidence of DNA changes in chronic animal experiments
Mobility in environment: Runs quickly through soil, can move into groundwater, solubilizes easily in most water systems
Toxicity to aquatic life: Studies show moderate to high toxicity to fish, algae, and invertebrates; even small spills matter
Degradation: Breaks down slowly—bioaccumulation not well documented but persistence in water poses a risk
Precaution: Anyone working with this solvent should have a spill plan to stop it from escaping to drains or waterways
Preferred disposal: Collect for solvent recovery or send to licensed chemical waste incinerators
Do not pour: Absolutely keep out of drains and the trash, local rules treat this as a hazardous chemical
Container washing: Empty drums must be triple-rinsed and marked for hazardous disposal
Safe transfer: Label and secure all waste solvents in sealed containers to avoid leaks
Classification: Ships as a hazardous chemical—labels must show the cancer risk icon and all drivers must be trained
Packaging: Only use leak-proof, shatter-resistant bottles; larger shipments require bonded tanks or steel drums
Spill response: Carry neutralizing agents and absorbent kits on transport routes, mandate vehicle inspection before trips
Restrictions: Carriers may refuse shipments without clear documentation, some regions ban bulk road transport outright
Cancer status: Classified by global agencies as a probable human carcinogen; strict monitoring in labs and factories worldwide
Use bans: Outright banned in many consumer and farming products, only professionals get access after special approval
Mandatory reporting: Any use or disposal above small lab quantities gets reported to health and environment authorities
Employee training: Workers must get regular safety training and health screening under current workplace laws
