☣️ UN 1436 • CLASS 4
UN 1436 — Zinc powder
Placard: Dangerous When Wet. ERG Guide 138. 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 1436 Quick Details
UN 1436
Product name: Zinc powder
DOT Class: 4
Placard type: Dangerous When Wet
ERG Guide: 138 (check current ERG)
Initial isolation: ERG 138: isolate 25m all directions; for large spills isolate 50m and evacuate downwind 300m
Common Hazards of UN 1436
- Produce flammable gases on contact with water.
- May ignite on contact with water or moist air.
- Some react vigorously or explosively on contact with water.
- May be ignited by heat, sparks or flames.
- May re-ignite after fire is extinguished.
- Some are transported in highly flammable liquids.
- Runoff may create fire or explosion hazard.
- Inhalation or contact with vapors, substance or decomposition products may cause severe injury or
Chemical Identity & Physical Properties
| Also known as | Zinc dustZinc metal powderBlue powderMetallic zinc powder |
| CAS Number | 7440-66-6 |
| Appearance | Gray to blue-gray metallic powder, odorless. Fine particulate solid at room temperature. |
| Flash Point | Not applicable (metal powder ignites on contact with moisture) |
| Boiling Point | 907C (1665F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Reacts with water or moisture to produce flammable hydrogen gas; may ignite spontaneously |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1436
Extinguishing Media
Dry chemical, dry sand, soda ash; DO NOT use water, foam, or CO2
PPE Requirements
⚠️ Level B minimum; SCBA required in confined spaces or fire; protective gloves to prevent skin contact
Isolation & Evacuation
ERG 138: isolate 25m all directions; for large spills isolate 50m and evacuate downwind 300m
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 138).
First Actions for a UN 1436 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.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- 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 300 meters (1000 feet).
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📋 Copy & Share Field Card
UN 1436 — Zinc powderHAZMAT RADIO NOTE — UN 1436
Product: Zinc powder
Class 4 / Dangerous When Wet / ERG 138
PPE: Level B minimum; SCBA required in confined spaces or fire; protective gloves to prevent skin contact
ISOLATION: ERG 138: isolate 25m all directions; for large spills isolate 50m and evacuate downwind 300m
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 1436 — Zinc powder
Class: 4 | Placard: Dangerous When Wet | ERG Guide: 138
Appearance: Gray to blue-gray metallic powder, odorless. Fine particulate solid at room temperature.
Water Reactivity: Reacts with water or moisture to produce flammable hydrogen gas; may ignite spontaneously
Extinguishing: Dry chemical, dry sand, soda ash; DO NOT use water, foam, or CO2
PPE: Level B minimum; SCBA required in confined spaces or fire; protective gloves to prevent skin contact
Isolation: ERG 138: isolate 25m all directions; for large spills isolate 50m and evacuate downwind 300m
— Key Hazards —
• Produce flammable gases on contact with water.
• May ignite on contact with water or moist air.
• Some react vigorously or explosively on contact with water.
— 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.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/1436 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1436 Zinc powder Cls4 ERG138 | ERG 138: isolate 25m all directions; for large spills isolate 50m and evacuate d | allfirefighter.com/hazmat/un/1436SMS / 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/1436
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Frequently Asked Questions about UN 1436
Produce flammable gases on contact with water. May ignite on contact with water or moist air. Some react vigorously or explosively on contact with water. May be ignited by heat, sparks or flames. May re-ignite after fire is extinguished. Some are transported in highly flammable liquids. Runoff may create fire or explosion hazard. Inhalation or contact with vapors, substance or decomposition products may cause severe injury or
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 in confined spaces or fire; protective gloves to prevent skin contact
Water reactivity: Reacts with water or moisture to produce flammable hydrogen gas; may ignite spontaneously. Recommended extinguishing: Dry chemical, dry sand, soda ash; DO NOT use water, foam, or CO2.
ERG Guide 138 recommendation: ERG 138: isolate 25m all directions; for large spills isolate 50m and evacuate downwind 300m
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 138 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.