☣️ UN 1328 • CLASS 4
UN 1328 — Hexamethylenetetramine
Placard: Flammable Solid. ERG Guide 133. 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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UN 1328 Quick Details
UN 1328
Product name: Hexamethylenetetramine
DOT Class: 4
Placard type: Flammable Solid
ERG Guide: 133 (check current ERG)
Initial isolation: ERG 133: isolate spill 25m in all directions; for large fire isolate 800m and consider evacuation
Common Hazards of UN 1328
- 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.
Chemical Identity & Physical Properties
| Also known as | HexamineMethenamineUrotropineHMT1,3,5,7-Tetraazatricyclo[3.3.1.13,7]decane |
| CAS Number | 100-97-0 |
| Appearance | White crystalline powder or colorless lustrous crystals with a slight ammonia-like odor. Solid at room temperature. |
| Flash Point | 250C (482F) |
| Boiling Point | Sublimes at 263C (505F) without melting |
| Vapor Density | Not applicable (solid, sublimes) |
| Water Reactivity | Soluble in water; no violent reaction but may release formaldehyde and ammonia upon hydrolysis in acidic conditions |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1328
Extinguishing Media
Water spray, dry chemical, CO2, or regular foam acceptable
PPE Requirements
⚠️ Level D for routine handling; Level C with respirator if dust generation or fire conditions; avoid inhalation of dust or fumes
Isolation & Evacuation
ERG 133: isolate spill 25m in all directions; for large fire isolate 800m and consider evacuation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 133).
First Actions for a UN 1328 Incident
- 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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📋 Copy & Share Field Card
UN 1328 — HexamethylenetetramineHAZMAT RADIO NOTE — UN 1328
Product: Hexamethylenetetramine
Class 4 / Flammable Solid / ERG 133
PPE: Level D for routine handling; Level C with respirator if dust generation or fire conditions; avoid inhalation of dust or fumes
ISOLATION: ERG 133: isolate spill 25m in all directions; for large fire 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 1328 — Hexamethylenetetramine
Class: 4 | Placard: Flammable Solid | ERG Guide: 133
Appearance: White crystalline powder or colorless lustrous crystals with a slight ammonia-like odor. Solid at room temperature.
Water Reactivity: Soluble in water; no violent reaction but may release formaldehyde and ammonia upon hydrolysis in acidic conditions
Extinguishing: Water spray, dry chemical, CO2, or regular foam acceptable
PPE: Level D for routine handling; Level C with respirator if dust generation or fire conditions; avoid inhalation of dust or fumes
Isolation: ERG 133: isolate spill 25m in all directions; for large fire 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/1328 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1328 Hexamethylenetetramine Cls4 ERG133 | ERG 133: isolate spill 25m in all directions; for large fire isolate 800m and co | allfirefighter.com/hazmat/un/1328SMS / 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/1328
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Frequently Asked Questions about UN 1328
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 D for routine handling; Level C with respirator if dust generation or fire conditions; avoid inhalation of dust or fumes
Water reactivity: Soluble in water; no violent reaction but may release formaldehyde and ammonia upon hydrolysis in acidic conditions. Recommended extinguishing: Water spray, dry chemical, CO2, or regular foam acceptable.
ERG Guide 133 recommendation: ERG 133: isolate spill 25m in all directions; for large fire isolate 800m and consider evacuation
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.