☣️ UN 1728 • CLASS 8
UN 1728 — Amyltrichlorosilane
Placard: Corrosive. ERG Guide 156. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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.
Amyltrichlorosilane is a colorless to pale yellow fuming liquid with a pungent, acrid odor that requires special handling and safety precautions.
Hazard overview: Amyltrichlorosilane is a combustible material that may burn but does not ignite readily. It will react with water to release flammable, toxic, or corrosive gases and runoff.
Response guidance: In case of emergency, isolate the spill area immediately and call the fire department. Use dry chemical, CO2, or sand to extinguish fires, and avoid water contact.
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UN 1728 Quick Details
UN 1728
Product name: Amyltrichlorosilane
DOT Class: 8
Placard type: Corrosive
ERG Guide: 156 (check current ERG)
Initial isolation: ERG 156: isolate spill area immediate 50m all directions; if tank/rail car involved in fire, isolate 800m all directions and consider evacuation
Common Hazards of UN 1728
- Combustible material: may burn but does not ignite readily.
- Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff.
- When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
- 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.
- Corrosives in contact with metals may evolve flammable hydrogen gas.
- Containers may explode when heated or if contaminated with water.
- TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance
Chemical Identity & Physical Properties
Amyltrichlorosilane is a colorless to pale yellow fuming liquid with a pungent, acrid odor that fumes in moist air due to reaction with atmospheric moisture.
| Also known as | n-AmyltrichlorosilanePentyltrichlorosilaneTrichloropentylsilanen-Pentyltrichlorosilane |
| CAS Number | 107-72-2 |
| Appearance | Colorless to pale yellow fuming liquid with a pungent, acrid odor. Fumes in moist air due to reaction with atmospheric moisture. |
| Flash Point | 62C (144F) |
| Boiling Point | 172C (342F) |
| Vapor Density | 6.5 (heavier than air) |
| Water Reactivity | Reacts violently with water, releasing hydrogen chloride (HCl) gas and heat. Avoid water contact. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1728
Extinguishing Media
Dry chemical, CO2, sand; do not use water or water-based foams
PPE Requirements
⚠️ Level B minimum required; SCBA and chemical-resistant suit mandatory due to corrosive vapors and water reactivity
Level B minimum PPE is required, including SCBA and chemical-resistant suit, due to corrosive vapors and water reactivity.
Isolation & Evacuation
ERG 156: isolate spill area immediate 50m all directions; if tank/rail car involved in fire, isolate 800m all directions and consider evacuation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 156).
First Actions for a UN 1728 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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📋 Copy & Share Field Card
UN 1728 — AmyltrichlorosilaneHAZMAT RADIO NOTE — UN 1728
Product: Amyltrichlorosilane
Class 8 / Corrosive / ERG 156
PPE: Level B minimum required; SCBA and chemical-resistant suit mandatory due to corrosive vapors and water reactivity
ISOLATION: ERG 156: isolate spill area immediate 50m all directions; if tank/rail car involved in fire, isolate 800m all directions and consider evacuation
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 1728 — Amyltrichlorosilane
Class: 8 | Placard: Corrosive | ERG Guide: 156
Appearance: Colorless to pale yellow fuming liquid with a pungent, acrid odor. Fumes in moist air due to reaction with atmospheric moisture.
Water Reactivity: Reacts violently with water, releasing hydrogen chloride (HCl) gas and heat. Avoid water contact.
Extinguishing: Dry chemical, CO2, sand; do not use water or water-based foams
PPE: Level B minimum required; SCBA and chemical-resistant suit mandatory due to corrosive vapors and water reactivity
Isolation: ERG 156: isolate spill area immediate 50m all directions; if tank/rail car involved in fire, isolate 800m all directions and consider evacuation
— Key Hazards —
• Combustible material: may burn but does not ignite readily.
• Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff.
• When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
— 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/1728 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1728 Amyltrichlorosilane Cls8 ERG156 | ERG 156: isolate spill area immediate 50m all directions; if tank/rail car invol | allfirefighter.com/hazmat/un/1728SMS / 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/amyltrichlorosilane-un-1728
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Frequently Asked Questions about UN 1728
Yes, UN 1728 is a combustible material.
Yes, UN 1728 reacts violently with water to release hydrogen chloride (HCl) gas and heat.
UN 1728 is a combustible and corrosive substance that can release flammable, toxic, or corrosive gases when reacting with water.
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.