☣️ UN 1358 • CLASS 4
UN 1358 — Zirconium powder, wetted with not less than 25% water
Placard: Flammable Solid. ERG Guide 170. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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.
Advertisement
UN 1358 Quick Details
UN 1358
Product name: Zirconium powder, wetted with not less than 25% water
DOT Class: 4
Placard type: Flammable Solid
ERG Guide: 170 (check current ERG)
Initial isolation: ERG 170: isolate spill area 25m all directions; if fire, isolate 800m and evacuate 800m in all directions
Common Hazards of UN 1358
- 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 metal powderWetted zirconiumZirconium dust wettedZr powder |
| CAS Number | 7440-67-7 |
| Appearance | Gray to black metallic powder, wetted with water to reduce reactivity. Odorless. Shipped as a dampened powder or paste. |
| Flash Point | Not applicable (pyrophoric metal) |
| Boiling Point | 4409C (7968F) |
| Vapor Density | Not applicable (solid metal) |
| Water Reactivity | May react violently when dry; wetted form reduces reactivity but must maintain minimum 25% water content to prevent ignition |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1358
Extinguishing Media
Dry sand, dry chemical, soda ash; do not use water on dry material; wetted material can be handled with water fog
PPE Requirements
⚠️ Level B minimum; SCBA required; chemical-resistant gloves and clothing; face shield for handling
Isolation & Evacuation
ERG 170: isolate spill area 25m all directions; if fire, isolate 800m and evacuate 800m in all directions
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 170).
First Actions for a UN 1358 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).
Advertisement
📋 Copy & Share Field Card
UN 1358 — Zirconium powder, wetted with not less tHAZMAT RADIO NOTE — UN 1358
Product: Zirconium powder, wetted with not less than 25% water
Class 4 / Flammable Solid / ERG 170
PPE: Level B minimum; SCBA required; chemical-resistant gloves and clothing; face shield for handling
ISOLATION: ERG 170: isolate spill area 25m all directions; if fire, isolate 800m and evacuate 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 1358 — Zirconium powder, wetted with not less than 25% water
Class: 4 | Placard: Flammable Solid | ERG Guide: 170
Appearance: Gray to black metallic powder, wetted with water to reduce reactivity. Odorless. Shipped as a dampened powder or paste.
Water Reactivity: May react violently when dry; wetted form reduces reactivity but must maintain minimum 25% water content to prevent ignition
Extinguishing: Dry sand, dry chemical, soda ash; do not use water on dry material; wetted material can be handled with water fog
PPE: Level B minimum; SCBA required; chemical-resistant gloves and clothing; face shield for handling
Isolation: ERG 170: isolate spill area 25m all directions; if fire, isolate 800m and evacuate 800m in all directions
— 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/1358 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1358 Zirconium powder, wetted with not less than 25% water Cls4 ERG170 | allfirefighter.com/hazmat/un/1358SMS / 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/1358
Advertisement
Frequently Asked Questions about UN 1358
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; SCBA required; chemical-resistant gloves and clothing; face shield for handling
Water reactivity: May react violently when dry; wetted form reduces reactivity but must maintain minimum 25% water content to prevent ignition. Recommended extinguishing: Dry sand, dry chemical, soda ash; do not use water on dry material; wetted material can be handled with water fog.
ERG Guide 170 recommendation: ERG 170: isolate spill area 25m all directions; if fire, isolate 800m and evacuate 800m in all directions
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.