☣️ UN 1376 • CLASS 4
Iron sponge, spent
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 1376
Class: 4
Placard type: Spontaneously Combustible
ERG: Guide 135 (check current ERG)
Isolation: ERG 135: isolate spill area 25m in all directions; if tank/rail car involved in fire, isolate 800m in all directions
Chemical & Response Details
| Also known as | Spent iron oxideSpent iron spongeIron oxide desulfurizing massSpent desulfurizing ironPyrophoric iron |
| Appearance | Dark brown to black porous solid material with a characteristic sulfurous odor. Consists of spent iron oxide that has been used in gas purification processes. |
| Flash Point | Not applicable (pyrophoric solid) |
| Boiling Point | Not applicable (solid material) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | May react with moisture generating heat; can ignite spontaneously when wet or exposed to humid air |
| Extinguishing | Dry sand, dry chemical, soda ash, or dry dolomite; no water or foam |
| PPE | ⚠️ Level B minimum; SCBA required; heat-resistant gloves; avoid generating dust; protect from moisture |
| Isolation | ERG 135: isolate spill area 25m in all directions; 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 1376 — Iron sponge, spent HAZMAT RADIO NOTE — UN 1376
Product: Iron sponge, spent
Class 4 / Spontaneously Combustible / ERG 135
PPE: Level B minimum; SCBA required; heat-resistant gloves; avoid generating dust; protect from moisture
ISOLATION: ERG 135: isolate spill area 25m in all directions; 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 1376 — Iron sponge, spent
Class: 4 | Placard: Spontaneously Combustible | ERG Guide: 135
Appearance: Dark brown to black porous solid material with a characteristic sulfurous odor. Consists of spent iron oxide that has been used in gas purification processes.
Water Reactivity: May react with moisture generating heat; can ignite spontaneously when wet or exposed to humid air
Extinguishing: Dry sand, dry chemical, soda ash, or dry dolomite; no water or foam
PPE: Level B minimum; SCBA required; heat-resistant gloves; avoid generating dust; protect from moisture
Isolation: ERG 135: isolate spill area 25m in all directions; 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/1376 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1376 Iron sponge, spent Cls4 ERG135 | ERG 135: isolate spill area 25m in all directions; if tank/rail car involved in | allfirefighter.com/hazmat/un/1376SMS / 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/1376
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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 B minimum; SCBA required; heat-resistant gloves; avoid generating dust; protect from moisture
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.