☣️ UN 1854 • CLASS 4
Barium alloys, pyrophoric
Placard: Spontaneously Combustible. 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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Quick details
UN 1854
Class: 4
Placard type: Spontaneously Combustible
ERG: Guide 135 (check current ERG)
Isolation: ERG 135: isolate 25m in all directions initially. If tank/rail car involved in fire, isolate 800m in all directions.
Chemical & Response Details
| Also known as | Pyrophoric barium alloysBarium metal alloysBarium amalgams |
| Appearance | Silvery-gray metallic solid or powder that ignites spontaneously in air. No distinct odor. Pyrophoric nature causes immediate ignition upon exposure to moisture or humid air. |
| Flash Point | Not applicable (pyrophoric solid - ignites spontaneously) |
| Boiling Point | Not applicable (metal alloy) |
| Vapor Density | Not applicable (solid metal) |
| Water Reactivity | Reacts violently with water producing flammable hydrogen gas and heat. May ignite spontaneously. Do not use water. |
| Extinguishing | Dry sand, dry salt (NaCl), dry graphite powder. No water, no foam, no CO2. |
| PPE | ⚠️ Level A recommended for spill response. SCBA required. Full chemical-resistant suit. Avoid any moisture contact. |
| Isolation | ERG 135: isolate 25m in all directions initially. If tank/rail car involved in fire, isolate 800m in all directions. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Flammable/combustible material.
- May ignite on contact with moist air or moisture.
- May burn rapidly with flare-burning effect.
- Some react vigorously or explosively on contact with water.
- Some may decompose explosively when heated or involved in a fire.
- May re-ignite after fire is extinguished.
- Runoff may create fire or explosion hazard.
- Containers may explode when heated.
First actions (field-minded)
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Stay upwind, uphill and/or upstream.
- Keep unauthorized personnel away.
- 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 1854 — Barium alloys, pyrophoric HAZMAT RADIO NOTE — UN 1854
Product: Barium alloys, pyrophoric
Class 4 / Spontaneously Combustible / ERG 135
PPE: Level A recommended for spill response. SCBA required. Full chemical-resistant suit. Avoid any moisture contact.
ISOLATION: ERG 135: isolate 25m in all directions initially. If tank/rail car involved in fire, isolate 800m in all directions.
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 1854 — Barium alloys, pyrophoric
Class: 4 | Placard: Spontaneously Combustible | ERG Guide: 135
Appearance: Silvery-gray metallic solid or powder that ignites spontaneously in air. No distinct odor. Pyrophoric nature causes immediate ignition upon exposure to moisture or humid air.
Water Reactivity: Reacts violently with water producing flammable hydrogen gas and heat. May ignite spontaneously. Do not use water.
Extinguishing: Dry sand, dry salt (NaCl), dry graphite powder. No water, no foam, no CO2.
PPE: Level A recommended for spill response. SCBA required. Full chemical-resistant suit. Avoid any moisture contact.
Isolation: ERG 135: isolate 25m in all directions initially. If tank/rail car involved in fire, isolate 800m in all directions.
— Key Hazards —
• Flammable/combustible material.
• May ignite on contact with moist air or moisture.
• May burn rapidly with flare-burning effect.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Stay upwind, uphill and/or upstream.
• Keep unauthorized personnel away.
• 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/1854 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1854 Barium alloys, pyrophoric Cls4 ERG135 | allfirefighter.com/hazmat/un/1854SMS / 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/1854
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FAQ
Flammable/combustible material. May ignite on contact with moist air or moisture. May burn rapidly with flare-burning effect. Some react vigorously or explosively on contact with water. Some may decompose explosively when heated or involved in a fire. May re-ignite after fire is extinguished. Runoff may create fire or explosion hazard. Containers may explode when heated.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Stay upwind, uphill and/or upstream. Keep unauthorized personnel away.
Level A recommended for spill response. SCBA required. Full chemical-resistant suit. Avoid any moisture contact.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 135 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.