☣️ UN 1724 • CLASS 8
UN 1724 — Allyltrichlorosilane, stabilized
Placard: Corrosive. ERG Guide 155. 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.
Allyltrichlorosilane, stabilized is a highly flammable and corrosive substance that poses significant risks to people and the environment. It is essential to handle this substance with extreme caution and follow proper emergency procedures.
Hazard overview: Allyltrichlorosilane, stabilized is highly flammable and can ignite easily, causing explosions. Vapors from this substance can also form explosive mixtures with air, leading to indoor and outdoor explosion hazards.
Response guidance: In case of an emergency, evacuate the area immediately and call the local emergency number. Use dry chemical, CO2, or dry sand to extinguish small fires, and water spray to cool containers only, not on the material itself.
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UN 1724 Quick Details
UN 1724
Product name: Allyltrichlorosilane, stabilized
DOT Class: 8
Placard type: Corrosive
ERG Guide: 155 (check current ERG)
Initial isolation: ERG 155: Initial isolation 50m in all directions. Protective action distance: spill 300m downwind daytime, 800m nighttime; fire 800m in all directions if tank/railcar involved.
Common Hazards of UN 1724
- HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
- Vapors form explosive mixtures with air: indoors, outdoors and sewers explosion hazards.
- Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas
- Vapors may travel to source of ignition and flash back.
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
- Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff.
- Corrosives in contact with metals may evolve flammable hydrogen gas.
- Containers may explode when heated or if contaminated with water.
Chemical Identity & Physical Properties
Allyltrichlorosilane, stabilized is a colorless to pale yellow fuming liquid with a pungent, acrid, irritating odor.
| Also known as | AllyltrichlorosilaneTrichloro(2-propenyl)silane3-TrichlorosilylpropeneAllyl silicon trichloride |
| CAS Number | 107-37-9 |
| Appearance | Colorless to pale yellow fuming liquid with a pungent, acrid, irritating odor. Fumes in moist air due to reaction with water vapor. |
| Flash Point | 35°C (95°F) |
| Boiling Point | 117-118°C (243-244°F) |
| Vapor Density | 6.3 (heavier than air) |
| Water Reactivity | Reacts violently with water, producing heat and corrosive hydrogen chloride (HCl) fumes. Do not use water directly on material. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1724
Extinguishing Media
Dry chemical, CO2, or dry sand for small fires. Use water spray from distance to cool containers only, not on material itself.
PPE Requirements
⚠️ Level B minimum (supplied-air respirator, chemical-resistant suit). Level A if vapors/fumes are concentrated or confined space entry required. SCBA mandatory.
Wear Level B minimum personal protective equipment (PPE), including a supplied-air respirator, chemical-resistant suit, and SCBA, and consider Level A PPE if vapors/fumes are concentrated or confined space entry is required.
Isolation & Evacuation
ERG 155: Initial isolation 50m in all directions. Protective action distance: spill 300m downwind daytime, 800m nighttime; fire 800m in all directions if tank/railcar involved.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 155).
First Actions for a UN 1724 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 in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- 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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UN 1724 — Allyltrichlorosilane, stabilizedHAZMAT RADIO NOTE — UN 1724
Product: Allyltrichlorosilane, stabilized
Class 8 / Corrosive / ERG 155
PPE: Level B minimum (supplied-air respirator, chemical-resistant suit). Level A if vapors/fumes are concentrated or confined space entry required. SCBA mandatory.
ISOLATION: ERG 155: Initial isolation 50m in all directions. Protective action distance: spill 300m downwind daytime, 800m nighttime; fire 800m in all directions if tank/railcar involved.
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 1724 — Allyltrichlorosilane, stabilized
Class: 8 | Placard: Corrosive | ERG Guide: 155
Appearance: Colorless to pale yellow fuming liquid with a pungent, acrid, irritating odor. Fumes in moist air due to reaction with water vapor.
Water Reactivity: Reacts violently with water, producing heat and corrosive hydrogen chloride (HCl) fumes. Do not use water directly on material.
Extinguishing: Dry chemical, CO2, or dry sand for small fires. Use water spray from distance to cool containers only, not on material itself.
PPE: Level B minimum (supplied-air respirator, chemical-resistant suit). Level A if vapors/fumes are concentrated or confined space entry required. SCBA mandatory.
Isolation: ERG 155: Initial isolation 50m in all directions. Protective action distance: spill 300m downwind daytime, 800m nighttime; fire 800m in all directions if tank/railcar involved.
— Key Hazards —
• HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
• Vapors form explosive mixtures with air: indoors, outdoors and sewers explosion hazards.
• Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas
— 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 in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
SOURCE: allfirefighter.com/hazmat/un/1724 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1724 Allyltrichlorosilane, stabilized Cls8 ERG155 | allfirefighter.com/hazmat/un/1724SMS / 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/allyltrichlorosilane-stabilized-un-1724
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Frequently Asked Questions about UN 1724
Yes, Allyltrichlorosilane, stabilized is highly flammable and can ignite easily.
Allyltrichlorosilane, stabilized reacts violently with water, producing heat and corrosive hydrogen chloride fumes.
Wear Level B minimum PPE, including a supplied-air respirator, chemical-resistant suit, and SCBA, and consider Level A PPE if vapors/fumes are concentrated or confined space entry is required.
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.