☣️ UN 1957 • CLASS 2
UN 1957 — Deuterium, compressed
Placard: Flammable Gas. ERG Guide 115. 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 1957 Quick Details
UN 1957
Product name: Deuterium, compressed
DOT Class: 2
Placard type: Flammable Gas
ERG Guide: 115 (check current ERG)
Initial isolation: ERG 115: isolate 100m all directions; for large spill consider evacuation 800m downwind
Common Hazards of UN 1957
- EXTREMELY FLAMMABLE.
- Will be easily ignited by heat, sparks or flames.
- Will form explosive mixtures with air.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
- Vapors may travel to source of ignition and flash back.
- Cylinders exposed to fire may vent and release flammable gas through pressure relief devices.
- Containers may explode when heated.
- Ruptured cylinders may rocket.
Chemical Identity & Physical Properties
| Also known as | Heavy hydrogenHydrogen-2D2Dideuterium |
| CAS Number | 7782-39-0 |
| Appearance | Colorless, odorless gas. Isotope of hydrogen with twice the molecular weight. Stored as a compressed gas in cylinders. |
| Flash Point | Not applicable (gas) |
| Boiling Point | -249.5C (-417F) |
| Vapor Density | 0.18 (lighter than air, but heavier than hydrogen) |
| Water Reactivity | No significant reaction with water |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1957
Extinguishing Media
Stop gas flow if safe to do so; dry chemical or CO2 for small fires; water spray to cool containers
PPE Requirements
⚠️ Level B minimum; SCBA required; fire-resistant clothing for fire exposure; insulated gloves for cryogenic contact
Isolation & Evacuation
ERG 115: isolate 100m all directions; for large spill consider evacuation 800m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 115).
First Actions for a UN 1957 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
- Isolate spill or leak area for at least 100 meters (330 feet) in all directions.
- Consider initial downwind evacuation for at least 800 meters (1/2 mile).
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📋 Copy & Share Field Card
UN 1957 — Deuterium, compressedHAZMAT RADIO NOTE — UN 1957
Product: Deuterium, compressed
Class 2 / Flammable Gas / ERG 115
PPE: Level B minimum; SCBA required; fire-resistant clothing for fire exposure; insulated gloves for cryogenic contact
ISOLATION: ERG 115: isolate 100m all directions; for large spill consider evacuation 800m 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 1957 — Deuterium, compressed
Class: 2 | Placard: Flammable Gas | ERG Guide: 115
Appearance: Colorless, odorless gas. Isotope of hydrogen with twice the molecular weight. Stored as a compressed gas in cylinders.
Water Reactivity: No significant reaction with water
Extinguishing: Stop gas flow if safe to do so; dry chemical or CO2 for small fires; water spray to cool containers
PPE: Level B minimum; SCBA required; fire-resistant clothing for fire exposure; insulated gloves for cryogenic contact
Isolation: ERG 115: isolate 100m all directions; for large spill consider evacuation 800m downwind
— Key Hazards —
• EXTREMELY FLAMMABLE.
• Will be easily ignited by heat, sparks or flames.
• Will form explosive mixtures with air.
— 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/1957 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1957 Deuterium, compressed Cls2 ERG115 | ERG 115: isolate 100m all directions; for large spill consider evacuation 800m d | allfirefighter.com/hazmat/un/1957SMS / 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/1957
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Frequently Asked Questions about UN 1957
EXTREMELY FLAMMABLE. Will be easily ignited by heat, sparks or flames. Will form explosive mixtures with air. Vapors from liquefied gas are initially heavier than air and spread along ground. Vapors may travel to source of ignition and flash back. Cylinders exposed to fire may vent and release flammable gas through pressure relief devices. Containers may explode when heated. Ruptured cylinders may rocket.
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 B minimum; SCBA required; fire-resistant clothing for fire exposure; insulated gloves for cryogenic contact
Water reactivity: No significant reaction with water. Recommended extinguishing: Stop gas flow if safe to do so; dry chemical or CO2 for small fires; water spray to cool containers.
ERG Guide 115 recommendation: ERG 115: isolate 100m all directions; for large spill consider evacuation 800m downwind
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 115 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.