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Chemical Name: 4-Vinylpyridine
Synonyms: 4-Ethenylpyridine
Chemical Formula: C7H7N
CAS Number: 100-43-6
Physical State: Colorless to pale yellow liquid
Odor: Pungent, amine-like smell
Common Uses: Intermediate for polymer production, research settings, cross-linking agent in resins
GHS Classification: Flammable liquid (Category 3), Acute toxicity oral (Category 3), Skin corrosion/irritation (Category 2), Serious eye damage/irritation (Category 2A), Acute aquatic toxicity (Category 1)
Pictograms: Exclamation mark, Health hazard, Environment, Flame
Hazard Statements: Causes skin and eye irritation, may cause respiratory tract irritation, toxic if inhaled or swallowed, highly flammable, hazardous to aquatic life
Routes of Exposure: Inhalation, skin contact, ingestion, eye contact
Summary: Handling 4-vinylpyridine means risk of burns, irritation, or poisoning if not careful. The chemical vapors irritate lungs easily, causing coughing or wheezing. Liquid splashes bring a real threat of burning or strong irritation upon contact. People working around it should always respect the hazards – even small splashes can spark off a chain of issues, because of how aggressive the substance is, both in direct and indirect exposure.
Main Ingredient: 4-Vinylpyridine (> 98%)
Impurities: May contain trace pyridine, stabilizers added by some producers to inhibit polymerization
Additive Details: Inhibitors like tert-butylcatechol sometimes included as a safety measure, especially during transport or long storage
Observations: Mixtures are rare in professional use. Most folks work with the pure monomer, appreciating how volatile it gets once opened.
Inhalation: Remove the person to fresh air without delay, keep them at rest, seek medical help right away especially if they have trouble breathing
Skin Contact: Remove contaminated clothing, wash skin thoroughly with soap and plenty of water, do not forget creases and nails
Eye Contact: Use running water to flush eyes for at least 15 minutes, make sure eyelids are held open, seek medical care without delay
Ingestion: Rinse mouth, do not induce vomiting, get medical advice or transport to clinic as fast as possible
Notes: People working with this chemical should have rapid access to eyewash stations and showers. A slow response drives risks sky-high, as the substance penetrates quickly and triggers more severe symptoms the longer it stays in contact.
Suitable Extinguishing Media: Use dry chemical powder, CO2, alcohol-resistant foam. Water spray helps cool surfaces and dilute vapors, but will not put out fires directly
Specific Hazards: Produces toxic fumes of nitrogen oxides and carbon oxides. Vapors can travel a long way to an ignition source, flash back, and spark fires in unexpected areas
Protective Equipment for Firefighters: Full-face, positive pressure self-contained breathing apparatus, chemical-resistant suit
Real-World Experience: In smaller labs, folks can forget just how flammable this monomer gets, and how serious even a splash fire can become, especially around open flames or electrical outlets.
Personal Precautions: Evacuate non-essential personnel, ventilate area, use appropriate PPE, prevent vapor buildup
Spill Clean-Up: Absorb liquid with inert materials (sand, diatomaceous earth), collect into a waste container, seal and label for disposal
Environmental Protection: Prevent entry into soil, drains, or water bodies. Even a small spill reaches groundwater fast and threatens aquatic life
Hands-On Tip: Do not let haste guide your spill response. Go with gloves and goggles first—a wiped-up spill with a rag can expose skin without you realizing it. Run ventilation systems before entering a spill site.
Handling: Use with local exhaust or in chemical hoods. Avoid inhaling vapor and touching skin. Keep containers closed tightly. Keep away from heat, sparks, and open flames.
Storage: Store in tightly closed containers, away from strong acids, oxidizers, or direct sunlight. Keep at low temperatures, and ensure stability inhibitors remain active.
Work Practice: Label all containers clearly. Separate from ordinary solvents, and don’t rely on a quick wipe to clean up splashes. Over years, many labs only avoid injuries by keeping routine tight and always checking bottle seals before opening.
Engineering Controls: Fume hoods or well-ventilated workspaces always take top priority
Personal Protective Equipment: Chemical-resistant gloves (nitrile preferable), lab coat, splash-proof goggles or face shield, heavy-duty apron if large quantities
Respiratory Protection: Use organic vapor respirator in situations where vapor levels exceed workplace recommendations
Exposure Limits: No widely published occupational exposure limits for the monomer, but treat as highly toxic and irritating—regard ventilation as essential. Research and safety staff emphasize training on donning gear properly, because improper fit leaves gaps and risks fast skin absorption.
Appearance: Clear to pale yellow liquid
Odor: Strong, unpleasant, amine-like
Boiling Point: Around 153°C
Melting Point: -17°C
Flash Point: 48°C (closed cup)
Explosive Limits: Lower: 1.2% / Upper: 9.5% by volume in air
Density: 0.976 g/cm³
Solubility: Miscible with organic solvents; poor miscibility in water
Stability in Light: May polymerize rapidly with heat or sunlight.
Personal Note: Spilled liquid volatilizes quickly, causing a strong odor in the workspace and warning anyone nearby, though this sharp smell often arrives too late to prevent exposure.
Chemical Stability: Unstable at high temperatures, light, or in presence of strong acids or oxidizers
Conditions to Avoid: Storage near heat sources, direct sunlight, and incompatible chemicals
Hazardous Decomposition: Emits nitrogen oxides and carbon oxides during fire or decomposition
Polymerization Risks: Uninhibited monomer can self-polymerize violently. Always check inhibitor present before storage.
Lessons Learned: Many incidents result from storage near peroxides or acids – separating incompatible materials during layout planning eliminates many preventable risks.
Possible Routes of Exposure: Inhalation, ingestion, skin and eye contact
Short-Term Effects: Irritation of eyes, skin, and mucous membranes; respiratory distress in high exposure
Long-Term Effects: Prolonged skin contact may bring on dermatitis; chronic exposure risks not well studied but call for caution
Animal Studies: Oral LD50 in rats: approximately 120–180 mg/kg, indicating substantial acute toxicity
Practical Takeaway: Even a few drops splashed or inhaled require cleanup and health checks, as real injury can occur at low doses. People in labs learn respect for the risk after witnessing just one close call.
Aquatic Toxicity: Toxic to aquatic life, both acute and in long-term persistence
Environmental Persistence: Limited biodegradability, may linger and migrate in water or sediment
Bioaccumulation: Not likely to build up in animal tissue, though the impact on aquatic organisms remains serious
Prevention: Every spill reaching waterways amplifies risk for years. Drain guard devices and catch basins reduce the chances and ease everyone’s mind.
Disposal Methods: Incinerate in a chemical waste facility with scrubber systems, do not pour in regular trash or drains
Container Handling: Rinse emptied drums with care, using solvent; triple rinse suggested for contaminated glassware
Legal Notes: Classified as hazardous waste, triggering strict disposal controls in many countries
Practical Example: Large facilities partner with licensed chemical waste contractors. Small-scale users log quantities in chemical registers to track how much leaves the site, making government audits much easier.
UN Number: 3076
Proper Shipping Name: 4-Vinylpyridine
Hazard Class: 6.1 (Toxic substances), 3 (Flammable liquids)
Packing Group: II
Transport Labeling: Toxic, Flammable
Packaging: Use UN-approved drums or bottles with leak-proof seals and secondary containment for larger shipments
Real Experience: Couriers require advance notice and careful documentation. Small packaging leaks can cause evacuations, so secondary containment becomes standard even on short trips.
Reach Status: Subject to registration within the European Union
OSHA (USA): Hazard communication standard applies, label and SDS requirements strictly enforced
Environmental Release: Strict local and national controls on bulk use, transport, and storage.
Worksite Reality: Regulatory officers carry out surprise inspections, so people keep records and training certifications up-to-date, not just for compliance but for long-term workplace safety assurance.
