☣️ UN 2852 • CLASS 4
Dipicryl sulphide, wetted with not less than 10% water
Placard: Flammable Solid. 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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Quick details
UN 2852
Class: 4
Placard type: Flammable Solid
ERG: Guide 113 (check current ERG)
Isolation: ERG 113: isolate 800m all directions initial; evacuate 1600m downwind if fire or dried material suspected
Chemical & Response Details
| Also known as | Hexanitrodiphenyl sulfideBis(2,4,6-trinitrophenyl) sulfidePicryl sulfideHNPS |
| CAS Number | 2217-06-3 |
| Appearance | Yellow to orange crystalline solid with no distinct odor. Explosive when dry; shipped wetted with at least 10% water as a desensitizer. |
| Flash Point | Not applicable (explosive solid when dry) |
| Boiling Point | Not applicable (decomposes/explodes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | No significant reaction with water; water used as desensitizer |
| Extinguishing | Water spray to keep wet, avoid foam or dry chemicals that may cause drying |
| PPE | ⚠️ Level B minimum; SCBA required; treat as explosive material if dried out |
| Isolation | ERG 113: isolate 800m all directions initial; evacuate 1600m downwind if fire or dried material suspected |
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 2852 — Dipicryl sulphide, wetted with not less HAZMAT RADIO NOTE — UN 2852
Product: Dipicryl sulphide, wetted with not less than 10% water
Class 4 / Flammable Solid / ERG 113
PPE: Level B minimum; SCBA required; treat as explosive material if dried out
ISOLATION: ERG 113: isolate 800m all directions initial; evacuate 1600m downwind if fire or dried material suspected
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 2852 — Dipicryl sulphide, wetted with not less than 10% water
Class: 4 | Placard: Flammable Solid | ERG Guide: 113
Appearance: Yellow to orange crystalline solid with no distinct odor. Explosive when dry; shipped wetted with at least 10% water as a desensitizer.
Water Reactivity: No significant reaction with water; water used as desensitizer
Extinguishing: Water spray to keep wet, avoid foam or dry chemicals that may cause drying
PPE: Level B minimum; SCBA required; treat as explosive material if dried out
Isolation: ERG 113: isolate 800m all directions initial; evacuate 1600m downwind if fire or dried material suspected
— 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/2852 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2852 Dipicryl sulphide, wetted with not less than 10% water Cls4 ERG113 | allfirefighter.com/hazmat/un/2852SMS / 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/2852
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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 B minimum; SCBA required; treat as explosive material if dried out
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.