☣️ UN 3241 • CLASS 4
2-Bromo-2-nitropropane-1, 3-diol
Placard: Flammable Solid. 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 3241
Class: 4
Placard type: Flammable Solid
ERG: Guide 133 (check current ERG)
Isolation: ERG 133: Small spill isolate 30m all directions; large spill isolate 100m all directions; fire scenario isolate 800m and consider evacuation
Chemical & Response Details
| Also known as | Bronopol2-Bromo-2-nitro-1,3-propanediolBronotakLexgard bronopolBNPD |
| CAS Number | 52-51-7 |
| Appearance | White to off-white crystalline powder or solid with a faint characteristic odor. Stable at room temperature but decomposes upon heating. |
| Flash Point | Not applicable (decomposes before melting) |
| Boiling Point | Not applicable (decomposes at approximately 130-140C) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Soluble in water; no violent reaction but may decompose slowly in aqueous solution releasing formaldehyde |
| Extinguishing | Dry chemical, CO2, water spray for cooling; foam may be used for large fires |
| PPE | ⚠️ Level C minimum with full-face respirator; Level B with SCBA for confined spaces or large releases; chemical-resistant gloves and clothing required |
| Isolation | ERG 133: Small spill isolate 30m all directions; large spill isolate 100m all directions; fire scenario isolate 800m and consider evacuation |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Flammable/combustible material.
- May be ignited by friction, heat, sparks or flames.
- Some may burn rapidly with flare-burning effect.
- Powders, dusts, shavings, borings, turnings or cuttings may explode or burn with explosive violence.
- Substance may be transported in a molten form at a temperature that may be above its flash point.
- May re-ignite after fire is extinguished.
- Fire may produce irritating and/or toxic gases.
- Contact may cause burns to skin and eyes.
First actions (field-minded)
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Isolate spill or leak area for at least 25 meters (75 feet) in all directions.
- Consider initial downwind evacuation for at least 100 meters (330 feet).
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UN 3241 — 2-Bromo-2-nitropropane-1, 3-diol HAZMAT RADIO NOTE — UN 3241
Product: 2-Bromo-2-nitropropane-1, 3-diol
Class 4 / Flammable Solid / ERG 133
PPE: Level C minimum with full-face respirator; Level B with SCBA for confined spaces or large releases; chemical-resistant gloves and clothing required
ISOLATION: ERG 133: Small spill isolate 30m all directions; large spill isolate 100m all directions; fire scenario isolate 800m and consider evacuation
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 3241 — 2-Bromo-2-nitropropane-1, 3-diol
Class: 4 | Placard: Flammable Solid | ERG Guide: 133
Appearance: White to off-white crystalline powder or solid with a faint characteristic odor. Stable at room temperature but decomposes upon heating.
Water Reactivity: Soluble in water; no violent reaction but may decompose slowly in aqueous solution releasing formaldehyde
Extinguishing: Dry chemical, CO2, water spray for cooling; foam may be used for large fires
PPE: Level C minimum with full-face respirator; Level B with SCBA for confined spaces or large releases; chemical-resistant gloves and clothing required
Isolation: ERG 133: Small spill isolate 30m all directions; large spill isolate 100m all directions; fire scenario isolate 800m and consider evacuation
— Key Hazards —
• Flammable/combustible material.
• May be ignited by friction, heat, sparks or flames.
• Some may burn rapidly with flare-burning effect.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Isolate spill or leak area for at least 25 meters (75 feet) in all directions.
SOURCE: allfirefighter.com/hazmat/un/3241 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3241 2-Bromo-2-nitropropane-1, 3-diol Cls4 ERG133 | allfirefighter.com/hazmat/un/3241SMS / 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/3241
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FAQ
Flammable/combustible material. May be ignited by friction, heat, sparks or flames. Some may burn rapidly with flare-burning effect. Powders, dusts, shavings, borings, turnings or cuttings may explode or burn with explosive violence. Substance may be transported in a molten form at a temperature that may be above its flash point. May re-ignite after fire is extinguished. Fire may produce irritating and/or toxic gases. Contact may cause burns to skin and eyes.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level C minimum with full-face respirator; Level B with SCBA for confined spaces or large releases; chemical-resistant gloves and clothing required
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 133 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.