☣️ UN 0342 • CLASS 1
Nitrocellulose, wetted
Placard: Explosive 1.3C. 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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Quick details
UN 0342
Class: 1
Placard type: Explosive 1.3C
ERG: Guide 112 (check current ERG)
Isolation: ERG 112: isolate spill or leak area immediately for at least 500m in all directions; if fire, evacuate 1600m radius; do not allow material to dry
Chemical & Response Details
| Also known as | Cellulose nitrateGuncottonPyroxylinCollodion cottonNitrocotton |
| CAS Number | 9004-70-0 |
| Appearance | White to slightly yellow fibrous solid or cotton-like material. Odorless or slight ether-like odor when wet. Shipped wetted with water or alcohol to reduce explosion hazard. |
| Flash Point | Not applicable (explosive solid, requires wetting agent) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | No reaction with water; water is used as desensitizing wetting agent |
| Extinguishing | Water spray only to keep wet; dry chemical, CO2 ineffective on established fires; never allow to dry out |
| PPE | ⚠️ Level B minimum; full structural firefighter protective clothing with SCBA; maintain safe distance due to deflagration risk |
| Isolation | ERG 112: isolate spill or leak area immediately for at least 500m in all directions; if fire, evacuate 1600m radius; do not allow material to dry |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Fire and burning hazard — not mass explosion.
- Intense heat and possible fragment projection.
- May deflagrate and initiate other materials.
- Smoke and toxic combustion products.
First actions (field-minded)
- CALL 911. Then call emergency response telephone number on shipping paper.
- Isolate area; stage upwind — fire and fragment hazard.
- Request Hazmat + law enforcement.
- Control ignition sources; deny entry.
- Consult current ERG Guide 112 and follow SOP/SOG.
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UN 0342 — Nitrocellulose, wetted HAZMAT RADIO NOTE — UN 0342
Product: Nitrocellulose, wetted
Class 1 / Explosive 1.3C / ERG 112
PPE: Level B minimum; full structural firefighter protective clothing with SCBA; maintain safe distance due to deflagration risk
ISOLATION: ERG 112: isolate spill or leak area immediately for at least 500m in all directions; if fire, evacuate 1600m radius; do not allow material to dry
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 0342 — Nitrocellulose, wetted
Class: 1 | Placard: Explosive 1.3C | ERG Guide: 112
Appearance: White to slightly yellow fibrous solid or cotton-like material. Odorless or slight ether-like odor when wet. Shipped wetted with water or alcohol to reduce explosion hazard.
Water Reactivity: No reaction with water; water is used as desensitizing wetting agent
Extinguishing: Water spray only to keep wet; dry chemical, CO2 ineffective on established fires; never allow to dry out
PPE: Level B minimum; full structural firefighter protective clothing with SCBA; maintain safe distance due to deflagration risk
Isolation: ERG 112: isolate spill or leak area immediately for at least 500m in all directions; if fire, evacuate 1600m radius; do not allow material to dry
— Key Hazards —
• Fire and burning hazard — not mass explosion.
• Intense heat and possible fragment projection.
• May deflagrate and initiate other materials.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper.
• Isolate area; stage upwind — fire and fragment hazard.
• Request Hazmat + law enforcement.
• Control ignition sources; deny entry.
SOURCE: allfirefighter.com/hazmat/un/0342 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0342 Nitrocellulose, wetted Cls1 ERG112 | ERG 112: isolate spill or leak area immediately for at least 500m in all directi | allfirefighter.com/hazmat/un/0342SMS / 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/0342
Related UN numbers (same class)
Discovery block for training / quick reference. Always consult the current ERG + your SOP/SOG for operations.
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FAQ
Fire and burning hazard — not mass explosion. Intense heat and possible fragment projection. May deflagrate and initiate other materials. Smoke and toxic combustion products.
CALL 911. Then call emergency response telephone number on shipping paper. Isolate area; stage upwind — fire and fragment hazard. Request Hazmat + law enforcement.
Level B minimum; full structural firefighter protective clothing with SCBA; maintain safe distance due to deflagration risk
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 112 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.