☣️ UN 3301 • CLASS 8
UN 3301 — Corrosive liquid, self-heating, n.o.s.
Placard: Corrosive. ERG Guide 136. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ 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.
Corrosive liquid, self-heating, n.o.s. can heat spontaneously and may ignite when exposed to air or incompatible materials. The exact product identity controls final tactics.
Hazard overview: Self-heating corrosive liquids can burn rapidly and produce dense irritating fumes. Water contact or metal contact may worsen heat release, corrosive vapor generation or hydrogen formation.
Response guidance: Isolate the release, keep incompatible materials away and use dry chemical, CO2 or sand only when compatible. Avoid water or foam unless product-specific guidance confirms they are safe.
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UN 3301 Quick Details
UN 3301
Product name: Corrosive liquid, self-heating, n.o.s.
DOT Class: 8
Placard type: Corrosive
ERG Guide: 136 (check current ERG)
Initial isolation: ERG 136: isolate spill area at least 25-50m in all directions; if fire or large spill, isolate 800m and evacuate downwind
Common Hazards of UN 3301
- Extremely flammable; will ignite itself if exposed to air.
- Burns rapidly, releasing dense, white, irritating fumes.
- Substance may be transported in a molten form.
- May re-ignite after fire is extinguished.
- Corrosives in contact with metals may evolve flammable hydrogen gas.
- Containers may explode when heated.
- Fire will produce irritating, corrosive and/or toxic gases.
- Ingestion or inhalation of decomposition products can cause serious injury or death.
Chemical Identity & Physical Properties
Appearance varies depending on specific substance; typically a corrosive liquid that may be transported in molten form. Self-heating properties mean it can spontaneously ignite when exposed to air.
| Also known as | Corrosive liquid, self-heating, not otherwise specifiedSelf-heating corrosive liquidUN3301 |
| Appearance | Appearance varies depending on specific substance; typically a corrosive liquid that may be transported in molten form. Self-heating properties mean it can spontaneously ignite when exposed to air. |
| Flash Point | Not applicable (self-heating material) |
| Boiling Point | Variable depending on specific substance |
| Vapor Density | Variable depending on specific substance, typically heavier than air |
| Water Reactivity | May react with water generating heat and corrosive fumes; avoid water contact |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3301
Extinguishing Media
Dry chemical, CO2, sand; do not use water or foam due to corrosive nature and self-heating properties
PPE Requirements
⚠️ Level A or B with SCBA required; full chemical-resistant suit; avoid all contact due to corrosive and self-heating hazards
Level A or B with SCBA required; full chemical-resistant suit; avoid all contact due to corrosive and self-heating hazards.
Isolation & Evacuation
ERG 136: isolate spill area at least 25-50m in all directions; if fire or large spill, isolate 800m and evacuate downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 136).
First Actions for a UN 3301 Incident
- CALL 911, then contact the emergency response telephone number shown on shipping papers, if available.
- Stay upwind, uphill and/or upstream.
- Keep unauthorized personnel away.
- 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 downwind protective distance based on conditions and incident command guidance.
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UN 3301 — Corrosive liquid, self-heating, n.o.s.HAZMAT RADIO NOTE — UN 3301
Product: Corrosive liquid, self-heating, n.o.s.
Class 8 / Corrosive / ERG 136
PPE: Level A or B with SCBA required; full chemical-resistant suit; avoid all contact due to corrosive and self-heating hazards
ISOLATION: ERG 136: isolate spill area at least 25-50m in all directions; if fire or large spill, isolate 800m and evacuate 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 3301 — Corrosive liquid, self-heating, n.o.s.
Class: 8 | Placard: Corrosive | ERG Guide: 136
Appearance: Appearance varies depending on specific substance; typically a corrosive liquid that may be transported in molten form. Self-heating properties mean it can spontaneously ignite when exposed to air.
Water Reactivity: May react with water generating heat and corrosive fumes; avoid water contact
Extinguishing: Dry chemical, CO2, sand; do not use water or foam due to corrosive nature and self-heating properties
PPE: Level A or B with SCBA required; full chemical-resistant suit; avoid all contact due to corrosive and self-heating hazards
Isolation: ERG 136: isolate spill area at least 25-50m in all directions; if fire or large spill, isolate 800m and evacuate downwind
— Key Hazards —
• Extremely flammable; will ignite itself if exposed to air.
• Burns rapidly, releasing dense, white, irritating fumes.
• Substance may be transported in a molten form.
— First Actions —
• CALL 911, then contact the emergency response telephone number shown on shipping papers, if available.
• Stay upwind, uphill and/or upstream.
• Keep unauthorized personnel away.
• Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters.
SOURCE: allfirefighter.com/hazmat/un/corrosive-liquid-self-heating-un-3301 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3301 Corrosive liquid, self-heating, n.o.s. Cls8 ERG136 | allfirefighter.com/hazmat/un/corrosive-liquid-self-heating-un-3301SMS / 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/corrosive-liquid-self-heating-un-3301
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Frequently Asked Questions about UN 3301
UN 3301 is Corrosive liquid, self-heating, n.o.s., assigned to ERG Guide 136 and placarded as Corrosive.
The main concern is its corrosive hazard, supported by ERG Guide 136 initial response guidance.
Yes, corrosive effects are possible. Avoid skin and eye contact and use chemical-resistant protection.
Yes or potentially so under incident conditions. Remove ignition sources and control vapors from a safe distance.
Use caution. May react with water generating heat and corrosive fumes; avoid water contact
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.