☣️ UN 2676 • CLASS 2
UN 2676 — Stibine
Placard: Toxic Gas. ERG Guide 119. 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.
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UN 2676 Quick Details
UN 2676
Product name: Stibine
DOT Class: 2
Placard type: Toxic Gas
ERG Guide: 119 (check current ERG)
Initial isolation: ERG 119: isolate 100m in all directions initially; if tank/rail car involved in fire isolate 800m and consider evacuation 1600m downwind
Common Hazards of UN 2676
- TOXIC; may be fatal if inhaled or absorbed through skin. Some may cause severe skin burns and
- Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
- Fire will produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may cause environmental contamination.
- Flammable; may be ignited by heat, sparks or flames.
- May form explosive mixtures with air. Ethylene oxide (UN1040) may react explosively even in the
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
Chemical Identity & Physical Properties
| Also known as | Antimony hydrideAntimony trihydrideHydrogen antimonide |
| CAS Number | 7803-52-3 |
| Appearance | Colorless gas with an unpleasant, garlic-like or fishy odor. Heavier than air and may accumulate in low-lying areas. |
| Flash Point | Not applicable (flammable gas) |
| Boiling Point | -17C (1F) |
| Vapor Density | 4.35 (much heavier than air) |
| Water Reactivity | Decomposes slowly in water, releasing antimony compounds |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2676
Extinguishing Media
Not applicable for gas; use water spray to cool containers, dry chemical or CO2 for small fires
PPE Requirements
⚠️ Level A required; full encapsulating suit with SCBA; extremely toxic by inhalation and skin absorption
Isolation & Evacuation
ERG 119: isolate 100m in all directions initially; if tank/rail car involved in fire isolate 800m and consider evacuation 1600m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 119).
First Actions for a UN 2676 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Many gases are heavier than air and will spread along the ground and collect in low or confined areas
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area for at least 100 meters (330 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 2676 — StibineHAZMAT RADIO NOTE — UN 2676
Product: Stibine
Class 2 / Toxic Gas / ERG 119
PPE: Level A required; full encapsulating suit with SCBA; extremely toxic by inhalation and skin absorption
ISOLATION: ERG 119: isolate 100m in all directions initially; if tank/rail car involved in fire isolate 800m and consider evacuation 1600m downwind
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 2676 — Stibine
Class: 2 | Placard: Toxic Gas | ERG Guide: 119
Appearance: Colorless gas with an unpleasant, garlic-like or fishy odor. Heavier than air and may accumulate in low-lying areas.
Water Reactivity: Decomposes slowly in water, releasing antimony compounds
Extinguishing: Not applicable for gas; use water spray to cool containers, dry chemical or CO2 for small fires
PPE: Level A required; full encapsulating suit with SCBA; extremely toxic by inhalation and skin absorption
Isolation: ERG 119: isolate 100m in all directions initially; if tank/rail car involved in fire isolate 800m and consider evacuation 1600m downwind
— Key Hazards —
• TOXIC; may be fatal if inhaled or absorbed through skin. Some may cause severe skin burns and
• Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
• Fire will produce irritating, corrosive and/or toxic gases.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Many gases are heavier than air and will spread along the ground and collect in low or confined areas
SOURCE: allfirefighter.com/hazmat/un/2676 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2676 Stibine Cls2 ERG119 | ERG 119: isolate 100m in all directions initially; if tank/rail car involved in | allfirefighter.com/hazmat/un/2676SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/2676
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Frequently Asked Questions about UN 2676
TOXIC; may be fatal if inhaled or absorbed through skin. Some may cause severe skin burns and Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may cause environmental contamination. Flammable; may be ignited by heat, sparks or flames. May form explosive mixtures with air. Ethylene oxide (UN1040) may react explosively even in the Those substances designated with a (P) may polymerize explosively when heated or involved in a fire. Vapors from liquefied gas are initially heavier than air and spread along ground.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level A required; full encapsulating suit with SCBA; extremely toxic by inhalation and skin absorption
Water reactivity: Decomposes slowly in water, releasing antimony compounds. Recommended extinguishing: Not applicable for gas; use water spray to cool containers, dry chemical or CO2 for small fires.
ERG Guide 119 recommendation: ERG 119: isolate 100m in all directions initially; if tank/rail car involved in fire isolate 800m and consider evacuation 1600m downwind
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 119 and your department SOP/SOG for incident-specific protective actions.
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.