☣️ UN 1545 • CLASS 6
UN 1545 — Allyl isothiocyanate, stabilized
Placard: Toxic. ERG Guide 131. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.
Allyl isothiocyanate, stabilized is a highly toxic substance that can cause severe irritation and burns upon contact with skin and eyes. It is essential to handle this substance with extreme caution.
Hazard overview: Inhalation or contact with allyl isothiocyanate, stabilized will irritate or burn skin and eyes. It may also cause tearing and severe skin absorption.
Response guidance: In case of exposure, immediately remove contaminated clothing and wash skin with soap and water. Use a full-face respirator or SCBA and chemically resistant suit, gloves, and boots to prevent further exposure.
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UN 1545 Quick Details
UN 1545
Product name: Allyl isothiocyanate, stabilized
DOT Class: 6
Placard type: Toxic
ERG Guide: 131 (check current ERG)
Initial isolation: ERG 131: Initial isolation 60m in all directions; protective action distance 0.3km daytime/0.5km nighttime for small spills, 0.8km daytime/2.4km nighttime for large spills
Common Hazards of UN 1545
- TOXIC; may be fatal if inhaled, ingested or absorbed through skin.
- Inhalation or contact with some of these materials will irritate or burn skin and eyes.
- Methyl chloroacetate (UN2295) is an eye irritant/lachrymator (causes flow of tears).
- Fire will produce irritating, corrosive and/or toxic gases.
- Vapors may cause dizziness or asphyxiation, especially when in closed or confined areas.
- Runoff from fire control or dilution water may cause environmental contamination.
- HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
- Vapors may form explosive mixtures with air.
Chemical Identity & Physical Properties
Allyl isothiocyanate, stabilized is a colorless to pale yellow oily liquid with a pungent, irritating, mustard-like or horseradish odor.
| 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 |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1545
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical powder, water spray for cooling only
PPE Requirements
⚠️ Level B minimum with full-face respirator or SCBA; chemically resistant suit, gloves, and boots required due to severe skin/eye hazard
Level B minimum with full-face respirator or SCBA; chemically resistant suit, gloves, and boots required due to severe skin/eye hazard
Isolation & Evacuation
ERG 131: Initial isolation 60m in all directions; protective action distance 0.3km daytime/0.5km nighttime for small spills, 0.8km daytime/2.4km nighttime for large spills
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 131).
First Actions for a UN 1545 Incident
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area for at least 50 meters (150 feet) in all directions.
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials: increase the immediate precautionary measure distance, in the downwind
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📋 Copy & Share Field Card
UN 1545 — Allyl isothiocyanate, stabilizedHAZMAT RADIO NOTE — UN 1545
Product: Allyl isothiocyanate, stabilized
Class 6 / Toxic / ERG 131
PPE: Level B minimum with full-face respirator or SCBA; chemically resistant suit, gloves, and boots required due to severe skin/eye hazard
ISOLATION: ERG 131: Initial isolation 60m in all directions; protective action distance 0.3km daytime/0.5km nighttime for small spills, 0.8km daytime/2.4km nighttime for large spills
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 1545 — Allyl isothiocyanate, stabilized
Class: 6 | Placard: Toxic | ERG Guide: 131
Appearance: Colorless to pale yellow oily liquid with a pungent, irritating, mustard-like or horseradish odor. Lachrymatory (causes tearing).
Water Reactivity: Slightly soluble in water; hydrolyzes slowly forming mustard oils and other compounds
Extinguishing: Alcohol-resistant foam, CO2, dry chemical powder, water spray for cooling only
PPE: Level B minimum with full-face respirator or SCBA; chemically resistant suit, gloves, and boots required due to severe skin/eye hazard
Isolation: ERG 131: Initial isolation 60m in all directions; protective action distance 0.3km daytime/0.5km nighttime for small spills, 0.8km daytime/2.4km nighttime for large spills
— Key Hazards —
• TOXIC; may be fatal if inhaled, ingested or absorbed through skin.
• Inhalation or contact with some of these materials will irritate or burn skin and eyes.
• Methyl chloroacetate (UN2295) is an eye irritant/lachrymator (causes flow of tears).
— First Actions —
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
• Isolate spill or leak area for at least 50 meters (150 feet) in all directions.
SOURCE: allfirefighter.com/hazmat/un/1545 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1545 Allyl isothiocyanate, stabilized Cls6 ERG131 | allfirefighter.com/hazmat/un/1545SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/allyl-isothiocyanate-stabilized-un-1545
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Frequently Asked Questions about UN 1545
No, UN 1545 Allyl isothiocyanate, stabilized is not flammable.
UN 1545 Allyl isothiocyanate, stabilized is highly toxic and may be fatal if inhaled, ingested or absorbed through skin.
Handle UN 1545 Allyl isothiocyanate, stabilized with extreme caution, wearing Level B minimum with full-face respirator or SCBA; chemically resistant suit, gloves, and boots.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles.
This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.