☣️ UN 1344 • CLASS 4
Trinitrophenol, wetted with not less than 30% water
Placard: Flammable Solid. 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.
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Quick details
UN 1344
Class: 4
Placard type: Flammable Solid
ERG: Guide 113 (check current ERG)
Isolation: ERG 113: Initial isolation 100m all directions; protective action distance 800m downwind for large spills. Evacuate if fire involves dry material or containers. Treat as mass explosion hazard if material has dried.
Chemical & Response Details
| Also known as | Picric acid2,4,6-TrinitrophenolTNPPicronitric acidMeliniteShimose |
| CAS Number | 88-89-1 |
| Appearance | Yellow crystalline solid with a bitter taste. Odorless when pure. Highly explosive when dry; shipped wetted with at least 30% water to reduce sensitivity. |
| Flash Point | Not applicable (wetted explosive solid) |
| Boiling Point | Explodes above 300C (572F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Soluble in water; forms highly sensitive metal salts with many metals including copper, lead, and iron. Do not allow dry material to contact metal surfaces. |
| Extinguishing | Water spray to keep wet; do not allow to dry. Avoid dry chemical or sand which may create friction. Never use on dry material. |
| PPE | ⚠️ Level A for fire or large spills; SCBA and full protective clothing mandatory. Treat as high explosive if material appears dry or crystalline. |
| Isolation | ERG 113: Initial isolation 100m all directions; protective action distance 800m downwind for large spills. Evacuate if fire involves dry material or containers. Treat as mass explosion hazard if material has dried. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Flammable/combustible material.
- May be ignited by heat, sparks or flames.
- DRIED OUT material may explode if exposed to heat, flame, friction or shock; treat as an
- Keep material wet with water or treat as an explosive (GUIDE 112).
- Runoff to sewer may create fire or explosion hazard.
- Some are toxic and may be fatal if inhaled, ingested or absorbed through skin. Specifically,
- Contact may cause burns to skin and eyes.
- Fire may produce irritating, corrosive and/or toxic gases.
First actions (field-minded)
- 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 immediately for at least 100 meters (330 feet) in all directions.
- Consider initial evacuation for 500 meters (1/3 mile) in all directions.
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UN 1344 — Trinitrophenol, wetted with not less tha HAZMAT RADIO NOTE — UN 1344
Product: Trinitrophenol, wetted with not less than 30% water
Class 4 / Flammable Solid / ERG 113
PPE: Level A for fire or large spills; SCBA and full protective clothing mandatory. Treat as high explosive if material appears dry or crystalline.
ISOLATION: ERG 113: Initial isolation 100m all directions; protective action distance 800m downwind for large spills. Evacuate if fire involves dry material or containers. Treat as mass explosion hazard if material has dried.
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 1344 — Trinitrophenol, wetted with not less than 30% water
Class: 4 | Placard: Flammable Solid | ERG Guide: 113
Appearance: Yellow crystalline solid with a bitter taste. Odorless when pure. Highly explosive when dry; shipped wetted with at least 30% water to reduce sensitivity.
Water Reactivity: Soluble in water; forms highly sensitive metal salts with many metals including copper, lead, and iron. Do not allow dry material to contact metal surfaces.
Extinguishing: Water spray to keep wet; do not allow to dry. Avoid dry chemical or sand which may create friction. Never use on dry material.
PPE: Level A for fire or large spills; SCBA and full protective clothing mandatory. Treat as high explosive if material appears dry or crystalline.
Isolation: ERG 113: Initial isolation 100m all directions; protective action distance 800m downwind for large spills. Evacuate if fire involves dry material or containers. Treat as mass explosion hazard if material has dried.
— Key Hazards —
• Flammable/combustible material.
• May be ignited by heat, sparks or flames.
• DRIED OUT material may explode if exposed to heat, flame, friction or shock; treat as an
— 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/1344 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1344 Trinitrophenol, wetted with not less than 30% water Cls4 ERG113 | allfirefighter.com/hazmat/un/1344SMS / 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/1344
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FAQ
Flammable/combustible material. May be ignited by heat, sparks or flames. DRIED OUT material may explode if exposed to heat, flame, friction or shock; treat as an Keep material wet with water or treat as an explosive (GUIDE 112). Runoff to sewer may create fire or explosion hazard. Some are toxic and may be fatal if inhaled, ingested or absorbed through skin. Specifically, Contact may cause burns to skin and eyes. Fire may produce irritating, corrosive and/or toxic gases.
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 A for fire or large spills; SCBA and full protective clothing mandatory. Treat as high explosive if material appears dry or crystalline.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 113 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.