☣️ UN 3452 • CLASS 6
UN 3452 — Xylidines, solid
Placard: Toxic. ERG Guide 153. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ Verification required:
Broad or variable material category; verify exact product, SDS and shipping papers.
⚠️ 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 3452 Xylidines, solid is assigned to ERG Guide 153. The exact risk depends on the shipment form, concentration and SDS, but responders should verify shipping papers before committing crews.
Hazard overview: Primary hazards for UN 3452 include: TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury or death.; Vapors, dusts, or molten material may irritate eyes and respiratory passages.; Contact with molten substance may cause severe burns to skin and eyes. Control ignition sources, avoid direct contact and keep personnel upwind.
Response guidance: For a UN 3452 incident, isolate the area, deny entry, stay upwind and use ERG Guide 153 with the shipping papers or SDS. Use compatible extinguishing media only and prevent contaminated runoff from spreading.
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UN 3452 Quick Details
UN 3452
Product name: Xylidines, solid
DOT Class: 6
Placard type: Toxic
ERG Guide: 153 (check current ERG)
Initial isolation: ERG 153: Isolate spill area immediate 50m in all directions. If tank/rail car involved in fire, isolate 800m in all directions and consider evacuation for 800m.
Common Hazards of UN 3452
- TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury or death.
- Vapors, dusts, or molten material may irritate eyes and respiratory passages.
- 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 contamination.
- Combustible material: may burn but does not ignite readily.
- When heated, vapors may form explosive mixtures with air, creating indoor, outdoor and sewer explosion hazards.
Chemical Identity & Physical Properties
UN 3452 is described as: White to yellowish-brown crystalline solid at room temperature. Sweet, aromatic amine odor. May darken upon exposure to air and light.
| Also known as | DimethylanilineDimethylbenzeneamineAminoxyleneMixed xylidinesMethyltoluidines |
| Appearance | White to yellowish-brown crystalline solid at room temperature. Sweet, aromatic amine odor. May darken upon exposure to air and light. |
| Flash Point | 97C (207F) |
| Boiling Point | 213-226C (415-439F) depending on isomer |
| Vapor Density | 4.2 (heavier than air) |
| Water Reactivity | No significant reaction with water. Slightly soluble in water. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3452
Extinguishing Media
Alcohol-resistant foam, dry chemical, CO2. Water spray may be used to keep containers cool.
PPE Requirements
⚠️ Level B minimum required. Full chemical protective suit with SCBA for spills or fire. Prevent skin and eye contact as material is absorbed through skin.
PPE guidance for UN 3452: Level B minimum required. Full chemical protective suit with SCBA for spills or fire. Prevent skin and eye contact as material is absorbed through skin.
Isolation & Evacuation
ERG 153: Isolate spill area immediate 50m in all directions. If tank/rail car involved in fire, isolate 800m in all directions and consider evacuation for 800m.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 153).
First Actions for a UN 3452 Incident
- CALL 911. Then call the emergency response telephone number on the shipping paper, if available.
- 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 distance in the downwind direction as conditions require.
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📋 Copy & Share Field Card
UN 3452 — Xylidines, solidHAZMAT RADIO NOTE — UN 3452
Product: Xylidines, solid
Class 6 / Toxic / ERG 153
PPE: Level B minimum required. Full chemical protective suit with SCBA for spills or fire. Prevent skin and eye contact as material is absorbed through skin.
ISOLATION: ERG 153: Isolate spill area immediate 50m in all directions. If tank/rail car involved in fire, isolate 800m in all directions and consider evacuation for 800m.
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 3452 — Xylidines, solid
Class: 6 | Placard: Toxic | ERG Guide: 153
Appearance: White to yellowish-brown crystalline solid at room temperature. Sweet, aromatic amine odor. May darken upon exposure to air and light.
Water Reactivity: No significant reaction with water. Slightly soluble in water.
Extinguishing: Alcohol-resistant foam, dry chemical, CO2. Water spray may be used to keep containers cool.
PPE: Level B minimum required. Full chemical protective suit with SCBA for spills or fire. Prevent skin and eye contact as material is absorbed through skin.
Isolation: ERG 153: Isolate spill area immediate 50m in all directions. If tank/rail car involved in fire, isolate 800m in all directions and consider evacuation for 800m.
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury or death.
• Vapors, dusts, or molten material may irritate eyes and respiratory passages.
• Contact with molten substance may cause severe burns to skin and eyes.
— First Actions —
• CALL 911. Then call the emergency response telephone number on the shipping paper, if available.
• 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/xylidines-solid-un-3452 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3452 Xylidines, solid Cls6 ERG153 | allfirefighter.com/hazmat/un/xylidines-solid-un-3452SMS / 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/xylidines-solid-un-3452
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Frequently Asked Questions about UN 3452
UN 3452 is Xylidines, solid, a Class 6 hazardous material assigned to ERG Guide 153.
UN 3452 may burn or support fire depending on the product and fire conditions. Keep ignition sources away and follow ERG 153.
No significant reaction with water. Slightly soluble in water.
Level B minimum required. Full chemical protective suit with SCBA for spills or fire. Prevent skin and eye contact as material is absorbed through skin.
ERG 153: Isolate spill area immediate 50m in all directions. If tank/rail car involved in fire, isolate 800m in all directions and consider evacuation for 800m.
Alcohol-resistant foam, dry chemical, CO2. Water spray may be used to keep containers cool.
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.