☣️ UN 0079 • CLASS 1.1D

UN 0079 — Hexanitrodiphenylamine; Dipicrylamine; Hexyl

Placard: Explosive 1.1. ERG Guide 112. 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.

UN 0079 At a Glance

UN 0079 (Hexanitrodiphenylamine; Dipicrylamine; Hexyl) is listed as DOT Class 1.1D Explosive 1.1 and is assigned to ERG Guide 112. Use this page to review placard data, common hazards, PPE notes, isolation context, first actions, and related UN numbers.

UN 0079 is Hexanitrodiphenylamine, also known as Dipicrylamine or Hexyl. It is a Class 1 explosive classified as Division 1.1, Compatibility Group D, meaning it presents a mass explosion hazard. Fire involving the material can produce an extremely dangerous explosive event, so responders should prioritize isolation, distance, evacuation and qualified explosive-ordnance support.

Hazard overview: UN 0079 presents a mass explosion hazard. Severe heat or fire can cause the material to decompose violently and may result in a major explosive event with blast overpressure and dangerous debris. Fire may also generate irritating, corrosive or toxic gases. Responders should not approach, move or disturb damaged explosive material unless directed by qualified explosive-ordnance personnel.

Response guidance: For a UN 0079 incident, establish incident command, verify the material and physical form from shipping papers and package markings, and establish an appropriate protective perimeter. Keep responders and the public away from the hazard area and request HazMat and qualified explosive-ordnance support. If fire reaches or threatens the explosive cargo, prioritize withdrawal, evacuation and life safety rather than close-range firefighting. Use the current ERG Guide 112 and local SOP/SOG for incident-specific decisions.

Firefighter training notes: Training for UN 0079 should emphasize the meaning of Division 1.1 and Compatibility Group D, recognition of the mass explosion hazard, the limitations of firefighter PPE against blast, the importance of distance and shielding, and early notification of HazMat and qualified explosive-ordnance personnel. Responders should also verify the physical form and packaging of the shipment before making operational decisions.

Regulatory context: UN 0079 is regulated as a Class 1 explosive, Division 1.1, Compatibility Group D. Current U.S. transportation references identify Hexanitrodiphenylamine, Dipicrylamine and Hexyl under UN 0079. Applicable packaging, transport, storage, security, quantity and emergency-response requirements vary by jurisdiction and transport mode. Verify current DOT, ADR, IMDG, IATA and local requirements as applicable.

Storage & handling: UN 0079 should be stored and handled only in accordance with applicable explosive-material regulations, approved packaging requirements and manufacturer or facility procedures. Protect the material from heat, fire, impact, unauthorized access and other conditions identified by the applicable explosive-storage requirements. Damaged or suspect material should be isolated and evaluated by qualified explosive-ordnance personnel.

UN 0079 Quick Details

UN 0079

Product name: Hexanitrodiphenylamine; Dipicrylamine; Hexyl

DOT Class: 1.1D

Placard type: Explosive 1.1

ERG Guide: 112 (check current ERG)

Initial isolation: Use the current ERG Guide 112 for initial isolation and protective-action guidance. Do not treat a single distance value as a universal operating perimeter. The appropriate protective distance depends on the quantity, packaging, fire involvement, location and incident conditions.

Common Hazards of UN 0079

UN 0079 is a Division 1.1 explosive with a mass explosion hazard.
An explosion can produce severe blast overpressure and dangerous fragments or debris.
Fire reaching the material may result in a violent explosion and can cause hazardous effects at substantial distances.
The material is an energetic solid and may decompose violently when exposed to severe heat or fire.
Damaged, heated or otherwise compromised explosive material should not be handled unnecessarily.
Fire may produce irritating, corrosive or toxic gases.
The exact hazard can depend on the physical form and packaging of the shipment, including whether the material is transported as powder or other dry solid.
Secondary fires, structural damage and debris may create additional hazards following an explosive event.

Chemical Identity & Physical Properties

Hexanitrodiphenylamine is a yellow solid that may occur in crystalline or powder form. It is an energetic compound and decomposes violently at high temperatures. Transport references identify different dry-solid physical forms, so the exact form of a shipment should be verified before response decisions are made.

Also known as	DipicrylamineHexyl2,2',4,4',6,6'-HexanitrodiphenylamineHexanitrodiphenylamineDipicrylamine
CAS Number	131-73-7
Appearance	A yellow solid that may occur as crystals or powder depending on the physical form of the shipment. The material is insoluble in water and alcohol and decomposes violently at high temperatures. Exact physical form and packaging should be confirmed from shipping papers and product documentation.
Flash Point	Not applicable to the solid explosive material.
Boiling Point	Not applicable; the material decomposes before normal boiling.
Vapor Density	Not applicable to the solid material.
Water Reactivity	The material is reported as insoluble in water. Do not infer field response tactics from solubility alone; use current ERG, SDS and incident-specific guidance.

Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.

Fireground Response Guidance — UN 0079

Extinguishing Media

For a fire involving UN 0079, close-range firefighting should not be undertaken when the explosive cargo is threatened. Fire-control decisions should follow the current ERG Guide 112, incident command and local explosive-material procedures. Remote operations may be considered only when they can be performed safely.

PPE Requirements

⚠️ No conventional firefighter PPE can protect personnel from a close-range mass explosion. Distance, shielding, isolation and evacuation are primary protective measures. SCBA may be appropriate for smoke exposure when responders can operate from a safe position, but respiratory protection does not mitigate blast or fragmentation hazards.

Blast and fragmentation protection cannot be provided by ordinary firefighter PPE. Distance, cover, shielding and evacuation are the primary protective measures. SCBA and structural firefighting PPE may provide protection from smoke or secondary fire hazards when operating from a safe position, but they must not be considered protection against a mass explosion.

Isolation & Evacuation

Use the current ERG Guide 112 for initial isolation and protective-action guidance. Do not treat a single distance value as a universal operating perimeter. The appropriate protective distance depends on the quantity, packaging, fire involvement, location and incident conditions.

Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 112).

First Actions for a UN 0079 Incident

Establish incident command and identify the material from shipping papers, package markings and available product documentation.
Keep unauthorized personnel away from the incident area and deny entry to the hazard area.
Stage responders at a safe distance and, when practical, remain upwind and uphill.
Request HazMat, law enforcement and qualified explosive-ordnance or bomb-disposal support when the material is involved in fire, damage or an uncertain condition.
Do not handle, move, open, dismantle or otherwise disturb the explosive material unless directed by appropriately qualified explosive-ordnance personnel.
If fire is approaching or has reached the explosive material, prioritize life safety, withdrawal and evacuation rather than close-range firefighting.
Protect exposures only when this can be accomplished from a safe position and in accordance with incident command and local SOP/SOG.
Use the current ERG Guide 112, shipping papers, product documentation and incident conditions to determine isolation and protective actions.

📋 Copy & Share Field Card

UN 0079 — Hexanitrodiphenylamine; Dipicrylamine; H

HAZMAT RADIO NOTE — UN 0079 Product: Hexanitrodiphenylamine; Dipicrylamine; Hexyl Class 1.1D / Explosive 1.1 / ERG 112 PPE: No conventional firefighter PPE can protect personnel from a close-range mass explosion. Distance, shielding, isolation and evacuation are primary protective measures. SCBA may be appropriate for smoke exposure when responders can operate from a safe position, but respiratory protection does not mitigate blast or fragmentation hazards. ISOLATION: Use the current ERG Guide 112 for initial isolation and protective-action guidance. Do not treat a single distance value as a universal operating perimeter. The appropriate protective distance depends on the quantity, packaging, fire involvement, location and incident conditions. 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 0079 — Hexanitrodiphenylamine; Dipicrylamine; Hexyl Class: 1.1D | Placard: Explosive 1.1 | ERG Guide: 112 Appearance: A yellow solid that may occur as crystals or powder depending on the physical form of the shipment. The material is insoluble in water and alcohol and decomposes violently at high temperatures. Exact physical form and packaging should be confirmed from shipping papers and product documentation. Water Reactivity: The material is reported as insoluble in water. Do not infer field response tactics from solubility alone; use current ERG, SDS and incident-specific guidance. Extinguishing: For a fire involving UN 0079, close-range firefighting should not be undertaken when the explosive cargo is threatened. Fire-control decisions should follow the current ERG Guide 112, incident command and local explosive-material procedures. Remote operations may be considered only when they can be performed safely. PPE: No conventional firefighter PPE can protect personnel from a close-range mass explosion. Distance, shielding, isolation and evacuation are primary protective measures. SCBA may be appropriate for smoke exposure when responders can operate from a safe position, but respiratory protection does not mitigate blast or fragmentation hazards. Isolation: Use the current ERG Guide 112 for initial isolation and protective-action guidance. Do not treat a single distance value as a universal operating perimeter. The appropriate protective distance depends on the quantity, packaging, fire involvement, location and incident conditions. — Key Hazards — • UN 0079 is a Division 1.1 explosive with a mass explosion hazard. • An explosion can produce severe blast overpressure and dangerous fragments or debris. • Fire reaching the material may result in a violent explosion and can cause hazardous effects at substantial distances. — First Actions — • Establish incident command and identify the material from shipping papers, package markings and available product documentation. • Keep unauthorized personnel away from the incident area and deny entry to the hazard area. • Stage responders at a safe distance and, when practical, remain upwind and uphill. • Request HazMat, law enforcement and qualified explosive-ordnance or bomb-disposal support when the material is involved in fire, damage or an uncertain condition. SOURCE: allfirefighter.com/hazmat/un/hexanitrodiphenylamine-dipicrylamine-un-0079 | Always use current ERG + SOP/SOGIC BRIEFING

Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.

UN0079 Hexanitrodiphenylamine; Dipicrylamine; Hexyl Cls1.1D ERG112 | allfirefighter.com/hazmat/un/hexanitrodiphenylamine-dipicrylamine-un-0079SMS / 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/hexanitrodiphenylamine-dipicrylamine-un-0079

Related UN Numbers in Class 1.1D

Open Class Guide →Hazmat Hub →

UN 0225

Next (UN 0225) →

Discovery block for training / quick reference. Always consult the current ERG + your SOP/SOG for operations.

Frequently Asked Questions about UN 0079

UN 0079 is Hexanitrodiphenylamine, also known as Dipicrylamine or Hexyl. It is a Class 1 explosive classified as Division 1.1, Compatibility Group D.

Yes. UN 0079 is classified in Division 1.1, which indicates a mass explosion hazard under the applicable transport classification.

UN 0079 is assigned to ERG Guide 112. Responders should use the current ERG together with shipping papers, product documentation and local emergency-response procedures.

Division 1.1 indicates a mass explosion hazard, while Compatibility Group D identifies the material as a secondary detonating explosive substance or a related explosive article within the applicable classification.

The primary hazard is a mass explosion with severe blast effects and potentially dangerous debris. Fire can trigger an explosive event, and combustion or decomposition may produce irritating, corrosive or toxic gases.

UN 0079 is classified as an explosive rather than as a flammable solid. Fire and severe heat can nevertheless cause violent decomposition or an explosive event.

No normal firefighter PPE protects against a close-range mass explosion. Distance, cover, shielding and evacuation are the primary controls. SCBA may be used for smoke exposure only when responders can operate from a safe position.

Close approach should not be undertaken when the explosive cargo is threatened by fire. Life safety, withdrawal, isolation and evacuation take priority, with decisions guided by the current ERG, incident command and qualified explosive-ordnance personnel.

Do not move, open, dismantle or otherwise disturb damaged explosive material. Establish a protective perimeter and request qualified explosive-ordnance or bomb-disposal assistance.

Transport references identify dry-solid variants including solid material other than powder and solid dry powder. The exact physical form should be confirmed from shipping papers and product documentation.

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.