☣️ UN 1334 • CLASS 4
UN 1334 — Naphthalene, refined
Placard: Flammable Solid. ERG Guide 133. 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 1334 Quick Details
UN 1334
Product name: Naphthalene, refined
DOT Class: 4
Placard type: Flammable Solid
ERG Guide: 133 (check current ERG)
Initial isolation: ERG 133: isolate 25m all directions initially; for large spills consider 50m isolation and evacuation of immediate area if fire develops
Common Hazards of UN 1334
- Flammable/combustible material.
- May be ignited by friction, heat, sparks or flames.
- Some may burn rapidly with flare-burning effect.
- Powders, dusts, shavings, borings, turnings or cuttings may explode or burn with explosive violence.
- Substance may be transported in a molten form at a temperature that may be above its flash point.
- May re-ignite after fire is extinguished.
- Fire may produce irritating and/or toxic gases.
- Contact may cause burns to skin and eyes.
Chemical Identity & Physical Properties
| Also known as | mothballswhite tarnaphthalintar camphormoth flakes |
| CAS Number | 91-20-3 |
| Appearance | White crystalline solid with a distinctive mothball odor. Sublimes at room temperature, producing characteristic aromatic vapors. |
| Flash Point | 79-87C (174-189F) |
| Boiling Point | 218C (424F) |
| Vapor Density | 4.4 (heavier than air) |
| Water Reactivity | Insoluble in water, no significant reaction |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1334
Extinguishing Media
Dry chemical, CO2, water spray, foam suitable for Class B fires
PPE Requirements
⚠️ Level C minimum; SCBA for enclosed spaces or large spills; avoid skin contact due to absorption risk
Isolation & Evacuation
ERG 133: isolate 25m all directions initially; for large spills consider 50m isolation and evacuation of immediate area if fire develops
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 133).
First Actions for a UN 1334 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.
- Isolate spill or leak area for at least 25 meters (75 feet) in all directions.
- Consider initial downwind evacuation for at least 100 meters (330 feet).
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📋 Copy & Share Field Card
UN 1334 — Naphthalene, refinedHAZMAT RADIO NOTE — UN 1334
Product: Naphthalene, refined
Class 4 / Flammable Solid / ERG 133
PPE: Level C minimum; SCBA for enclosed spaces or large spills; avoid skin contact due to absorption risk
ISOLATION: ERG 133: isolate 25m all directions initially; for large spills consider 50m isolation and evacuation of immediate area if fire develops
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 1334 — Naphthalene, refined
Class: 4 | Placard: Flammable Solid | ERG Guide: 133
Appearance: White crystalline solid with a distinctive mothball odor. Sublimes at room temperature, producing characteristic aromatic vapors.
Water Reactivity: Insoluble in water, no significant reaction
Extinguishing: Dry chemical, CO2, water spray, foam suitable for Class B fires
PPE: Level C minimum; SCBA for enclosed spaces or large spills; avoid skin contact due to absorption risk
Isolation: ERG 133: isolate 25m all directions initially; for large spills consider 50m isolation and evacuation of immediate area if fire develops
— Key Hazards —
• Flammable/combustible material.
• May be ignited by friction, heat, sparks or flames.
• Some may burn rapidly with flare-burning effect.
— 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.
• Isolate spill or leak area for at least 25 meters (75 feet) in all directions.
SOURCE: allfirefighter.com/hazmat/un/1334 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1334 Naphthalene, refined Cls4 ERG133 | ERG 133: isolate 25m all directions initially; for large spills consider 50m iso | allfirefighter.com/hazmat/un/1334SMS / 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/1334
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Frequently Asked Questions about UN 1334
Flammable/combustible material. May be ignited by friction, heat, sparks or flames. Some may burn rapidly with flare-burning effect. Powders, dusts, shavings, borings, turnings or cuttings may explode or burn with explosive violence. Substance may be transported in a molten form at a temperature that may be above its flash point. May re-ignite after fire is extinguished. Fire may produce irritating and/or toxic gases. Contact may cause burns to skin and eyes.
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 C minimum; SCBA for enclosed spaces or large spills; avoid skin contact due to absorption risk
Water reactivity: Insoluble in water, no significant reaction. Recommended extinguishing: Dry chemical, CO2, water spray, foam suitable for Class B fires.
ERG Guide 133 recommendation: ERG 133: isolate 25m all directions initially; for large spills consider 50m isolation and evacuation of immediate area if fire develops
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 133 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.