☣️ UN 2858 • CLASS 4
UN 2858 — Zirconium, dry, coiled wire, finished metal sheets, strip
Placard: Flammable Solid. ERG Guide 170. 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 2858 Quick Details
UN 2858
Product name: Zirconium, dry, coiled wire, finished metal sheets, strip
DOT Class: 4
Placard type: Flammable Solid
ERG Guide: 170 (check current ERG)
Initial isolation: ERG 170: Isolate spill or leak area immediately for at least 25-50 meters in all directions. If fire involved, isolate 800 meters in all directions and consider initial evacuation for 800 meters.
Common Hazards of UN 2858
- May react violently or explosively on contact with water.
- Some are transported in flammable liquids.
- May be ignited by friction, heat, sparks or flames.
- Some of these materials will burn with intense heat.
- Dusts or fumes may form explosive mixtures in air.
- Containers may explode when heated.
- May re-ignite after fire is extinguished.
- Oxides from metallic fires are a severe health hazard.
Chemical Identity & Physical Properties
| Also known as | Zirconium metalZirconium wireZirconium sheetZirconium stripZr metal |
| CAS Number | 7440-67-7 |
| Appearance | Silvery-gray to grayish-black metallic solid. Odorless. Appears as coiled wire, finished sheets, or strip form. |
| Flash Point | Not applicable (pyrophoric metal when finely divided) |
| Boiling Point | 4409C (7968F) |
| Vapor Density | Not applicable (solid metal) |
| Water Reactivity | Finely divided forms react violently with water, releasing flammable hydrogen gas. Finished coils, sheets, and strips are less reactive but may still react under certain conditions. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2858
Extinguishing Media
Dry sand, dry chemical, soda ash. Do not use water, foam, or halogenated agents.
PPE Requirements
⚠️ Level B minimum for fire conditions; SCBA required. Protective gloves and clothing to prevent friction ignition.
Isolation & Evacuation
ERG 170: Isolate spill or leak area immediately for at least 25-50 meters in all directions. If fire involved, isolate 800 meters in all directions and consider initial evacuation for 800 meters.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 170).
First Actions for a UN 2858 Incident
- 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
- Consider initial downwind evacuation for at least 50 meters (160 feet).
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UN 2858 — Zirconium, dry, coiled wire, finished meHAZMAT RADIO NOTE — UN 2858
Product: Zirconium, dry, coiled wire, finished metal sheets, strip
Class 4 / Flammable Solid / ERG 170
PPE: Level B minimum for fire conditions; SCBA required. Protective gloves and clothing to prevent friction ignition.
ISOLATION: ERG 170: Isolate spill or leak area immediately for at least 25-50 meters in all directions. If fire involved, isolate 800 meters in all directions and consider initial evacuation for 800 meters.
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 2858 — Zirconium, dry, coiled wire, finished metal sheets, strip
Class: 4 | Placard: Flammable Solid | ERG Guide: 170
Appearance: Silvery-gray to grayish-black metallic solid. Odorless. Appears as coiled wire, finished sheets, or strip form.
Water Reactivity: Finely divided forms react violently with water, releasing flammable hydrogen gas. Finished coils, sheets, and strips are less reactive but may still react under certain conditions.
Extinguishing: Dry sand, dry chemical, soda ash. Do not use water, foam, or halogenated agents.
PPE: Level B minimum for fire conditions; SCBA required. Protective gloves and clothing to prevent friction ignition.
Isolation: ERG 170: Isolate spill or leak area immediately for at least 25-50 meters in all directions. If fire involved, isolate 800 meters in all directions and consider initial evacuation for 800 meters.
— Key Hazards —
• May react violently or explosively on contact with water.
• Some are transported in flammable liquids.
• May be ignited by friction, heat, sparks or flames.
— 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/2858 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2858 Zirconium, dry, coiled wire, finished metal sheets, strip Cls4 ERG170 | allfirefighter.com/hazmat/un/2858SMS / 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/2858
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Frequently Asked Questions about UN 2858
May react violently or explosively on contact with water. Some are transported in flammable liquids. May be ignited by friction, heat, sparks or flames. Some of these materials will burn with intense heat. Dusts or fumes may form explosive mixtures in air. Containers may explode when heated. May re-ignite after fire is extinguished. Oxides from metallic fires are a severe health hazard.
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 for fire conditions; SCBA required. Protective gloves and clothing to prevent friction ignition.
Water reactivity: Finely divided forms react violently with water, releasing flammable hydrogen gas. Finished coils, sheets, and strips are less reactive but may still react under certain conditions.. Recommended extinguishing: Dry sand, dry chemical, soda ash. Do not use water, foam, or halogenated agents..
ERG Guide 170 recommendation: ERG 170: Isolate spill or leak area immediately for at least 25-50 meters in all directions. If fire involved, isolate 800 meters in all directions and consider initial evacuation for 800 meters.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 170 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.