☣️ UN 1673 • CLASS 6
UN 1673 — Phenylenediamines
Placard: Toxic. ERG Guide 153. 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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UN 1673 Quick Details
UN 1673
Product name: Phenylenediamines
DOT Class: 6
Placard type: Toxic
ERG Guide: 153 (check current ERG)
Initial isolation: ERG 153: isolate spill 25-50m all directions; in fire isolate 800m and consider evacuation for 1600m downwind
Common Hazards of UN 1673
- TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
- Methyl bromoacetate (UN2643) is an eye irritant/lachrymator (causes flow of tears).
- Contact with molten substance may cause severe burns to skin and eyes.
- Avoid any skin contact.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental
- Combustible material: may burn but does not ignite readily.
- When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
Chemical Identity & Physical Properties
| Also known as | BenzenediamineDiaminobenzenePDAp-Phenylenediaminem-Phenylenediamineo-Phenylenediamine |
| Appearance | Colorless to pale yellow or brown crystalline solid with a faint amine-like odor. Darkens on exposure to air. Exists as three isomers (ortho, meta, para). |
| Flash Point | 156C (313F) for para-isomer |
| Boiling Point | 267C (513F) for para-isomer, decomposes |
| Vapor Density | Not applicable (solid at room temperature) |
| Water Reactivity | No significant reaction with water, but may dissolve slowly |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1673
Extinguishing Media
Dry chemical, CO2, water spray, or foam suitable for Class 6 materials
PPE Requirements
⚠️ Level B minimum; full chemical-resistant suit, SCBA required; material is toxic by all routes of exposure including skin absorption
Isolation & Evacuation
ERG 153: isolate spill 25-50m all directions; in fire isolate 800m and consider evacuation for 1600m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 153).
First Actions for a UN 1673 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 in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials: increase the immediate precautionary measure distance, in the downwind
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📋 Copy & Share Field Card
UN 1673 — PhenylenediaminesHAZMAT RADIO NOTE — UN 1673
Product: Phenylenediamines
Class 6 / Toxic / ERG 153
PPE: Level B minimum; full chemical-resistant suit, SCBA required; material is toxic by all routes of exposure including skin absorption
ISOLATION: ERG 153: isolate spill 25-50m all directions; in fire isolate 800m and consider evacuation for 1600m downwind
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 1673 — Phenylenediamines
Class: 6 | Placard: Toxic | ERG Guide: 153
Appearance: Colorless to pale yellow or brown crystalline solid with a faint amine-like odor. Darkens on exposure to air. Exists as three isomers (ortho, meta, para).
Water Reactivity: No significant reaction with water, but may dissolve slowly
Extinguishing: Dry chemical, CO2, water spray, or foam suitable for Class 6 materials
PPE: Level B minimum; full chemical-resistant suit, SCBA required; material is toxic by all routes of exposure including skin absorption
Isolation: ERG 153: isolate spill 25-50m all directions; in fire isolate 800m and consider evacuation for 1600m downwind
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
• Methyl bromoacetate (UN2643) is an eye irritant/lachrymator (causes flow of tears).
• Contact with molten substance may cause severe burns to skin and eyes.
— 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/1673 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1673 Phenylenediamines Cls6 ERG153 | ERG 153: isolate spill 25-50m all directions; in fire isolate 800m and consider | allfirefighter.com/hazmat/un/1673SMS / 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/1673
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Frequently Asked Questions about UN 1673
TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury Methyl bromoacetate (UN2643) is an eye irritant/lachrymator (causes flow of tears). Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental Combustible material: may burn but does not ignite readily. When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
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; full chemical-resistant suit, SCBA required; material is toxic by all routes of exposure including skin absorption
Water reactivity: No significant reaction with water, but may dissolve slowly. Recommended extinguishing: Dry chemical, CO2, water spray, or foam suitable for Class 6 materials.
ERG Guide 153 recommendation: ERG 153: isolate spill 25-50m all directions; in fire isolate 800m and consider evacuation for 1600m downwind
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 153 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.