☣️ UN 3313 • CLASS 4
Organic pigments, self-heating
Placard: Spontaneously Combustible. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ 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 3313
Class: 4
Placard type: Spontaneously Combustible
ERG: Guide 135 (check current ERG)
Isolation: ERG 135: isolate spill area 25m (80 ft) in all directions; if tank/railcar involved in fire, isolate 800m (0.5 mile) radius; evacuate immediate area if container exposed to fire
Chemical & Response Details
| Also known as | Self-heating organic pigmentsOrganic colorantsPyrophoric pigmentsSelf-igniting pigments |
| Appearance | Fine powders or granular solids, various colors (red, yellow, blue, orange, etc.) depending on specific pigment. Dry, dusty appearance at room temperature. |
| Flash Point | Not applicable (self-heating solid) |
| Boiling Point | Not applicable (solid material, may decompose before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | May ignite on contact with moisture or humid air - water exposure can trigger self-heating and spontaneous combustion |
| Extinguishing | Dry chemical, dry sand, or dry earth only - DO NOT use water, foam, or CO2 which contain moisture |
| PPE | ⚠️ Level B minimum with SCBA required; heat-resistant gloves and protective clothing to protect against spontaneous ignition; work in well-ventilated area away from moisture |
| Isolation | ERG 135: isolate spill area 25m (80 ft) in all directions; if tank/railcar involved in fire, isolate 800m (0.5 mile) radius; evacuate immediate area if container exposed to fire |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Flammable/combustible material.
- May ignite on contact with moist air or moisture.
- May burn rapidly with flare-burning effect.
- Some react vigorously or explosively on contact with water.
- Some may decompose explosively when heated or involved in a fire.
- May re-ignite after fire is extinguished.
- Runoff may create fire or explosion hazard.
- Containers may explode when heated.
First actions (field-minded)
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- 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 the immediate precautionary measure distance, in the downwind
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UN 3313 — Organic pigments, self-heating HAZMAT RADIO NOTE — UN 3313
Product: Organic pigments, self-heating
Class 4 / Spontaneously Combustible / ERG 135
PPE: Level B minimum with SCBA required; heat-resistant gloves and protective clothing to protect against spontaneous ignition; work in well-ventilated area away from moisture
ISOLATION: ERG 135: isolate spill area 25m (80 ft) in all directions; if tank/railcar involved in fire, isolate 800m (0.5 mile) radius; evacuate immediate area if container exposed to fire
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 3313 — Organic pigments, self-heating
Class: 4 | Placard: Spontaneously Combustible | ERG Guide: 135
Appearance: Fine powders or granular solids, various colors (red, yellow, blue, orange, etc.) depending on specific pigment. Dry, dusty appearance at room temperature.
Water Reactivity: May ignite on contact with moisture or humid air - water exposure can trigger self-heating and spontaneous combustion
Extinguishing: Dry chemical, dry sand, or dry earth only - DO NOT use water, foam, or CO2 which contain moisture
PPE: Level B minimum with SCBA required; heat-resistant gloves and protective clothing to protect against spontaneous ignition; work in well-ventilated area away from moisture
Isolation: ERG 135: isolate spill area 25m (80 ft) in all directions; if tank/railcar involved in fire, isolate 800m (0.5 mile) radius; evacuate immediate area if container exposed to fire
— Key Hazards —
• Flammable/combustible material.
• May ignite on contact with moist air or moisture.
• May burn rapidly with flare-burning effect.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• 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/3313 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3313 Organic pigments, self-heating Cls4 ERG135 | allfirefighter.com/hazmat/un/3313SMS / 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/3313
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FAQ
Flammable/combustible material. May ignite on contact with moist air or moisture. May burn rapidly with flare-burning effect. Some react vigorously or explosively on contact with water. Some may decompose explosively when heated or involved in a fire. May re-ignite after fire is extinguished. Runoff may create fire or explosion hazard. Containers may explode when heated.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Stay upwind, uphill and/or upstream. Keep unauthorized personnel away.
Level B minimum with SCBA required; heat-resistant gloves and protective clothing to protect against spontaneous ignition; work in well-ventilated area away from moisture
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 135 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.