UN 1545 — Allyl isothiocyanate, stabilized
Placard: Toxic. ERG Guide 131. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 1545 is Allyl isothiocyanate, stabilized, a toxic stabilized liquid assigned to ERG Guide 131. It has strong irritant/lachrymator effects and may burn or produce toxic gases if heated.
Hazard overview: UN 1545 presents toxic inhalation, skin absorption and severe irritation hazards. Vapors can burn eyes and respiratory tissue, and fire may produce corrosive or toxic gases.
Response guidance: For a UN 1545 incident, responders should verify the product with shipping papers, package markings, SDS and ERG Guide 131. Establish incident command, isolate the area, stay upwind, prevent incompatible contact and choose extinguishing or spill-control actions based on ERG, SDS and local SOP.
Firefighter training notes: Training for UN 1545 should emphasize toxic exposure routes, dust/vapor control, SCBA use, decontamination and avoiding skin contact. Use ERG 131, SDS and local SOP.
Regulatory context: Allyl isothiocyanate, stabilized is regulated as a toxic hazardous material. Transportation, workplace exposure, spill reporting, waste handling, storage and environmental requirements may vary by concentration, quantity and jurisdiction. Verify current requirements through shipping papers, SDS, facility documents and applicable DOT, OSHA, EPA, NFPA, state or local authority guidance.
Storage & handling: Allyl isothiocyanate, stabilized should be stored in tightly closed compatible containers in a secure, cool, dry, well-ventilated toxic-material area away from food, combustibles where incompatible, heat and unauthorized access. Prevent dust release, leaks and contaminated runoff.
UN 1545 Quick Details
Common Hazards of UN 1545
- TOXIC combustible liquid; inhalation, ingestion or skin absorption may cause serious injury.
- Strong irritant/lachrymator vapors can burn or irritate eyes, skin and respiratory tissue.
- Vapors may be heavier than air and collect in low or confined areas.
- May burn when heated; vapors may ignite under fire conditions.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff may be toxic and irritating to personnel and waterways.
- Containers may rupture or explode when heated.
Chemical Identity & Physical Properties
Colorless to pale yellow oily liquid with a pungent, irritating, mustard-like or horseradish odor. Lachrymatory (causes tearing).
| Also known as | AITCAllyl mustard oil3-Isothiocyanato-1-propeneVolatile oil of mustardSynthetic oil of mustard |
| CAS Number | 57-06-7 |
| Appearance | Colorless to pale yellow oily liquid with a pungent, irritating, mustard-like or horseradish odor. Lachrymatory (causes tearing). |
| Flash Point | 46°C (115°F) |
| Boiling Point | 150-152°C (302-306°F) |
| Vapor Density | 3.4 (heavier than air) |
| Water Reactivity | Slightly soluble in water; hydrolyzes slowly forming mustard oils and other compounds |
Fireground Response Guidance — UN 1545
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for dust, vapor, fire or confined-space exposure. Chemical-resistant gloves, eye/face protection and protective clothing should be selected from SDS; avoid all skin contact and contaminated dust.
Isolation & Evacuation
First Actions for a UN 1545 Incident
- CALL 911. Then call the emergency response telephone number on the shipping paper, if available.
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Avoid breathing vapors, dust or mist and avoid all skin or eye contact.
- Do not touch or walk through spilled material unless properly trained and wearing appropriate protective equipment.
- Ventilate closed spaces before entering, but only if properly trained, equipped, monitored and authorized by incident command.
- Isolate the spill or leak area and expand the perimeter if vapor, dust, fire involvement or unknown concentration is present.
- Use ERG Guide 131, shipping papers, SDS, air monitoring and incident command for protective actions.
📋 Copy & Share Field Card
UN 1545 — Allyl isothiocyanate, stabilizedUse 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.