☣️ UN 1355 • CLASS 4
UN 1355 — Trinitrobenzoic acid, wetted with not less than 30% water
Placard: Flammable Solid. ERG Guide 113. 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 1355 Quick Details
UN 1355
Product name: Trinitrobenzoic acid, wetted with not less than 30% water
DOT Class: 4
Placard type: Flammable Solid
ERG Guide: 113 (check current ERG)
Initial isolation: ERG 113: isolate spill 25m all directions; for large spills isolate 50m, evacuate 150m downwind if fire
Common Hazards of UN 1355
- 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.
Chemical Identity & Physical Properties
| Also known as | TNB2,4,6-Trinitrobenzoic acidPicric acid carboxylic analogTNBA |
| CAS Number | 129-66-8 |
| Appearance | Pale yellow to tan crystalline solid when wetted. Odorless or slight aromatic odor. Shipped wetted with at least 30% water as a desensitizer to reduce explosive hazard. |
| Flash Point | Not applicable (wetted explosive solid) |
| Boiling Point | Not applicable (decomposes) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | No significant reaction with water; water desensitizes the explosive |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1355
Extinguishing Media
Water spray, fog, or foam acceptable for wetted material; avoid dry chemical on dry material
PPE Requirements
⚠️ Level B minimum; SCBA required; avoid contact with dried material which is shock-sensitive
Isolation & Evacuation
ERG 113: isolate spill 25m all directions; for large spills isolate 50m, evacuate 150m downwind if fire
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 113).
First Actions for a UN 1355 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 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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📋 Copy & Share Field Card
UN 1355 — Trinitrobenzoic acid, wetted with not leHAZMAT RADIO NOTE — UN 1355
Product: Trinitrobenzoic acid, wetted with not less than 30% water
Class 4 / Flammable Solid / ERG 113
PPE: Level B minimum; SCBA required; avoid contact with dried material which is shock-sensitive
ISOLATION: ERG 113: isolate spill 25m all directions; for large spills isolate 50m, evacuate 150m downwind if fire
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 1355 — Trinitrobenzoic acid, wetted with not less than 30% water
Class: 4 | Placard: Flammable Solid | ERG Guide: 113
Appearance: Pale yellow to tan crystalline solid when wetted. Odorless or slight aromatic odor. Shipped wetted with at least 30% water as a desensitizer to reduce explosive hazard.
Water Reactivity: No significant reaction with water; water desensitizes the explosive
Extinguishing: Water spray, fog, or foam acceptable for wetted material; avoid dry chemical on dry material
PPE: Level B minimum; SCBA required; avoid contact with dried material which is shock-sensitive
Isolation: ERG 113: isolate spill 25m all directions; for large spills isolate 50m, evacuate 150m downwind if fire
— 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/1355 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1355 Trinitrobenzoic acid, wetted with not less than 30% water Cls4 ERG113 | allfirefighter.com/hazmat/un/1355SMS / 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/1355
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Frequently Asked Questions about UN 1355
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 B minimum; SCBA required; avoid contact with dried material which is shock-sensitive
Water reactivity: No significant reaction with water; water desensitizes the explosive. Recommended extinguishing: Water spray, fog, or foam acceptable for wetted material; avoid dry chemical on dry material.
ERG Guide 113 recommendation: ERG 113: isolate spill 25m all directions; for large spills isolate 50m, evacuate 150m downwind if fire
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.