☣️ UN 1310 • CLASS 4
UN 1310 — Ammonium picrate, wetted with not less than 10% 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.
Ammonium picrate, wetted with not less than 10% water is a highly explosive substance that can ignite spontaneously in air. It is essential to handle this substance with extreme caution.
Hazard overview: Ammonium picrate, wetted with not less than 10% water is a flammable/combustible material that may be ignited by heat, sparks, or flames. It is highly explosive when dry.
Response guidance: In case of fire, use water spray to keep the material wet and do not dry out. Foam may be used for adjacent fires, but keep the material wet.
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UN 1310 Quick Details
UN 1310
Product name: Ammonium picrate, wetted with not less than 10% water
DOT Class: 4
Placard type: Flammable Solid
ERG Guide: 113 (check current ERG)
Initial isolation: ERG 113: isolate 800m all directions for spill; if fire or material dried out, treat as mass explosion hazard and evacuate 1600m radius
Common Hazards of UN 1310
- 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
Ammonium picrate, wetted with not less than 10% water is a yellow crystalline solid with no distinct odor when wetted.
| Also known as | Ammonium picrate (wetted)Picric acid ammonium saltAmmonium 2,4,6-trinitrophenolateExplosive D |
| CAS Number | 131-74-8 |
| Appearance | Yellow crystalline solid with no distinct odor when wetted. Highly explosive when dry; shipped wetted with at least 10% water to reduce sensitivity. |
| Flash Point | Not applicable (wetted desensitized explosive solid) |
| Boiling Point | Decomposes before boiling; approximately 280-300C |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | No significant reaction with water; water acts as desensitizer and must be maintained above 10% by weight |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1310
Extinguishing Media
Water spray to keep wet; do not dry out; foam may be used for adjacent fires but keep material wet
PPE Requirements
⚠️ Level B minimum with SCBA required; structural firefighters' protective clothing provides limited protection; treat as explosive if dried
Level B minimum PPE is required, including a self-contained breathing apparatus (SCBA), and structural firefighters' protective clothing provides limited protection.
Isolation & Evacuation
ERG 113: isolate 800m all directions for spill; if fire or material dried out, treat as mass explosion hazard and evacuate 1600m radius
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 113).
First Actions for a UN 1310 Incident
- 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 1310 — Ammonium picrate, wetted with not less tHAZMAT RADIO NOTE — UN 1310
Product: Ammonium picrate, wetted with not less than 10% water
Class 4 / Flammable Solid / ERG 113
PPE: Level B minimum with SCBA required; structural firefighters' protective clothing provides limited protection; treat as explosive if dried
ISOLATION: ERG 113: isolate 800m all directions for spill; if fire or material dried out, treat as mass explosion hazard and evacuate 1600m radius
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 1310 — Ammonium picrate, wetted with not less than 10% water
Class: 4 | Placard: Flammable Solid | ERG Guide: 113
Appearance: Yellow crystalline solid with no distinct odor when wetted. Highly explosive when dry; shipped wetted with at least 10% water to reduce sensitivity.
Water Reactivity: No significant reaction with water; water acts as desensitizer and must be maintained above 10% by weight
Extinguishing: Water spray to keep wet; do not dry out; foam may be used for adjacent fires but keep material wet
PPE: Level B minimum with SCBA required; structural firefighters' protective clothing provides limited protection; treat as explosive if dried
Isolation: ERG 113: isolate 800m all directions for spill; if fire or material dried out, treat as mass explosion hazard and evacuate 1600m radius
— 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 —
• 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.
SOURCE: allfirefighter.com/hazmat/un/1310 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1310 Ammonium picrate, wetted with not less than 10% water Cls4 ERG113 | allfirefighter.com/hazmat/un/1310SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/ammonium-picrate-wetted-with-un-1310
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Frequently Asked Questions about UN 1310
Yes, UN 1310 is a flammable solid.
No, UN 1310 does not react significantly with water.
Level B minimum PPE, including a self-contained breathing apparatus (SCBA).
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.