☣️ UN 2738 • CLASS 6
UN 2738 — N-Butylaniline
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.
N-Butylaniline is a toxic aromatic amine and combustible liquid. Response should emphasize skin-absorption control, vapor control and medical follow-up for exposed personnel.
Hazard overview: The main concern is toxic exposure, especially through skin contact or inhalation. Fire conditions can generate toxic nitrogen oxide smoke and heavier-than-air vapors.
Response guidance: Isolate the area, eliminate ignition sources and keep liquid out of drains. Use alcohol-resistant foam, dry chemical or CO2 for fire control; cool containers with water spray.
Advertisement
UN 2738 Quick Details
UN 2738
Product name: N-Butylaniline
DOT Class: 6
Placard type: Toxic
ERG Guide: 153 (check current ERG)
Initial isolation: ERG 153: Initial isolation 50m in all directions; protective action distance 0.3km daytime, 0.8km nighttime for large spills; evacuate immediate area if fire involves tank/rail car
Common Hazards of UN 2738
- N-Butylaniline is toxic by inhalation, ingestion and skin absorption.
- Aniline-type exposure may affect blood oxygen transport; medical evaluation is important after exposure.
- Liquid can irritate or injure skin and eyes and may be absorbed through intact skin.
- Combustible liquid; heated vapors can form ignitable mixtures.
- Vapors are heavier than air and may collect in low or confined spaces.
- Fire can produce toxic nitrogen oxides and irritating smoke.
- Contaminated runoff may create environmental and exposure hazards.
Chemical Identity & Physical Properties
Colorless to pale yellow liquid with an aniline-like or amine odor. Slightly oily consistency at room temperature
| Also known as | N-PhenylbutylamineButylphenylamineN-Butylbenzenamine4-Anilinebutane |
| CAS Number | 1126-78-9 |
| Appearance | Colorless to pale yellow liquid with an aniline-like or amine odor. Slightly oily consistency at room temperature. |
| Flash Point | 107C (225F) |
| Boiling Point | 241-243C (466-469F) |
| Vapor Density | 5.2 (heavier than air) |
| Water Reactivity | No significant reaction with water, but slightly soluble and may slowly hydrolyze in presence of moisture. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2738
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical powder recommended; water spray for cooling only
PPE Requirements
⚠️ Level B minimum with SCBA required; chemical-resistant suit, gloves, and boots mandatory due to severe skin absorption hazard and corrosive properties
Use SCBA, chemical-resistant suit, gloves and boots; prevent all liquid contact because skin absorption is a major route.
Isolation & Evacuation
ERG 153: Initial isolation 50m in all directions; protective action distance 0.3km daytime, 0.8km nighttime for large spills; evacuate immediate area if fire involves tank/rail car
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 153).
First Actions for a UN 2738 Incident
- Call 911 and the emergency response number shown on the shipping papers.
- Keep unauthorized personnel away and deny entry to the spill or fire area.
- Stay upwind, uphill and upstream; avoid low areas where vapors or runoff may collect.
- Avoid breathing dust, vapor, mist or smoke; prevent skin and eye contact.
- Do not touch damaged containers or spilled material without appropriate PPE.
- Ventilate confined spaces only if personnel are trained, equipped and monitored.
- Use the ERG, SDS, shipping papers and air monitoring to set isolation, PPE and tactical decisions.
Advertisement
📋 Copy & Share Field Card
UN 2738 — N-ButylanilineHAZMAT RADIO NOTE — UN 2738
Product: N-Butylaniline
Class 6 / Toxic / ERG 153
PPE: Level B minimum with SCBA required; chemical-resistant suit, gloves, and boots mandatory due to severe skin absorption hazard and corrosive properties
ISOLATION: ERG 153: Initial isolation 50m in all directions; protective action distance 0.3km daytime, 0.8km nighttime for large spills; evacuate immediate area if fire involves tank/rail car
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 2738 — N-Butylaniline
Class: 6 | Placard: Toxic | ERG Guide: 153
Appearance: Colorless to pale yellow liquid with an aniline-like or amine odor. Slightly oily consistency at room temperature.
Water Reactivity: No significant reaction with water, but slightly soluble and may slowly hydrolyze in presence of moisture.
Extinguishing: Alcohol-resistant foam, CO2, dry chemical powder recommended; water spray for cooling only
PPE: Level B minimum with SCBA required; chemical-resistant suit, gloves, and boots mandatory due to severe skin absorption hazard and corrosive properties
Isolation: ERG 153: Initial isolation 50m in all directions; protective action distance 0.3km daytime, 0.8km nighttime for large spills; evacuate immediate area if fire involves tank/rail car
— Key Hazards —
• N-Butylaniline is toxic by inhalation, ingestion and skin absorption.
• Aniline-type exposure may affect blood oxygen transport; medical evaluation is important after exposure.
• Liquid can irritate or injure skin and eyes and may be absorbed through intact skin.
— First Actions —
• Call 911 and the emergency response number shown on the shipping papers.
• Keep unauthorized personnel away and deny entry to the spill or fire area.
• Stay upwind, uphill and upstream; avoid low areas where vapors or runoff may collect.
• Avoid breathing dust, vapor, mist or smoke; prevent skin and eye contact.
SOURCE: allfirefighter.com/hazmat/un/n-butylaniline-un-2738 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN2738 N-Butylaniline Cls6 ERG153 | allfirefighter.com/hazmat/un/n-butylaniline-un-2738SMS / 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/n-butylaniline-un-2738
Advertisement
Frequently Asked Questions about UN 2738
UN 2738 is N-Butylaniline, regulated as a toxic aniline-type combustible liquid for transport and emergency response.
The main concern is a toxic aniline-type combustible liquid behavior plus exposure risk from dust, vapor, liquid or fire products.
Approach from upwind, isolate the area, keep nonessential people out and verify the exact product with shipping papers or SDS.
Water is not expected to react violently, but contaminated runoff should be contained and kept out of drains.
Use SCBA, chemical-resistant suit, gloves and boots; prevent all liquid contact because skin absorption is a major route.
Fire can produce toxic nitrogen oxides and heavy vapors; container heating may increase rupture risk.
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.