UN 3269 — Polyester resin kit, liquid base material
Placard: Flammable. ERG Guide 128. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 3269 is Polyester resin kit, liquid base material, a flammable resin kit base assigned to ERG Guide 128. Styrene-type vapors, flashback and polymerization risk require control.
Hazard overview: HIGHLY FLAMMABLE polyester resin base; styrene or similar monomer vapors may ignite easily. Vapors are heavier than air and may travel to ignition sources and flash back. Vapor explosion hazard exists in drains, basements, sewers and confined areas.
Response guidance: For UN 3269, isolate the area, eliminate ignition sources and keep vapors out of drains. Use SCBA, contain runoff and select foam/dry chemical/CO2 using SDS and ERG 128.
Firefighter training notes: Training for UN 3269 should emphasize product verification, SCBA use, vapor/dust monitoring, fire behavior, decontamination and runoff control. Use ERG 128, SDS and local SOP.
Regulatory context: Polyester resin kit, liquid base material is regulated as a hazardous material for transport and emergency response. Storage, reporting, exposure, waste and incident-notification duties depend on quantity, composition, concentration and jurisdiction; verify shipping papers, SDS and authority guidance.
Storage & handling: Polyester resin kit, liquid base material should be stored in approved flammable-liquid containers with ventilation, ignition control, secondary containment and segregation from oxidizers and incompatible materials.
UN 3269 Quick Details
Common Hazards of UN 3269
- HIGHLY FLAMMABLE polyester resin base; styrene or similar monomer vapors may ignite easily.
- Vapors are heavier than air and may travel to ignition sources and flash back.
- Vapor explosion hazard exists in drains, basements, sewers and confined areas.
- Heat, contamination or peroxide catalyst contact may trigger polymerization and pressure buildup.
- Liquid may float on water and spread fire or contamination.
- Fire may produce carbon monoxide, styrene smoke and irritating/toxic gases.
- Containers may rupture or explode when heated.
Chemical Identity & Physical Properties
Clear to amber viscous liquid with a characteristic styrene-like or chemical odor. Typically contains unsaturated polyester dissolved in reactive monomers, commonly styrene.
| Also known as | Polyester resin kitLiquid polyester resin baseUnsaturated polyester resin liquidFiberglass resin liquid basePolyester laminating resin |
| Appearance | Clear to amber viscous liquid with a characteristic styrene-like or chemical odor. Typically contains unsaturated polyester dissolved in reactive monomers, commonly styrene. |
| Flash Point | -4°C to 32°C (25°F to 90°F) depending on styrene content |
| Boiling Point | 145°C to 165°C (293°F to 329°F) typical range for styrene component |
| Vapor Density | 3.6 (heavier than air, based on styrene vapor) |
| Water Reactivity | No significant reaction with water; insoluble but may polymerize under certain conditions |
Fireground Response Guidance — UN 3269
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for vapor, dust, smoke, fire or confined-space exposure. Wear chemical-resistant gloves, eye/face protection and protective clothing.
Isolation & Evacuation
First Actions for a UN 3269 Incident
- Call 911 and the emergency response number on the shipping paper, if available.
- Keep unauthorized personnel away and establish incident command.
- Stay upwind, uphill and upstream.
- Eliminate ignition sources if this can be done safely.
- Avoid breathing vapor, dust, mist, smoke or fumes and avoid skin or eye contact.
- Do not touch damaged containers or spilled material without proper training and PPE.
- Prevent contaminated liquid, dust, runoff and decontamination waste from spreading.
- Ventilate confined spaces only after monitoring and only if properly trained and equipped.
- Use ERG Guide 128, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 3269 — Polyester resin kit, liquid base materiaUse for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.