☣️ UN 1990 • CLASS 9
UN 1990 — Benzaldehyde
Placard: Miscellaneous. ERG Guide 171. 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 1990 Quick Details
UN 1990
Product name: Benzaldehyde
DOT Class: 9
Placard type: Miscellaneous
ERG Guide: 171 (check current ERG)
Initial isolation: ERG 171: isolate spill 25m in all directions; for large spills consider initial downwind evacuation 100m
Common Hazards of UN 1990
- Some may burn but none ignite readily.
- Containers may explode when heated.
- Some may be transported hot.
- For UN3508, Capacitor, asymmetric, be aware of possible short circuiting as this product is transported
- Polymeric beads, expandable (UN2211) may evolve flammable vapours.
- Inhalation of material may be harmful.
- Contact may cause burns to skin and eyes.
- Inhalation of Asbestos dust may have a damaging effect on the lungs.
Chemical Identity & Physical Properties
| Also known as | Benzoic aldehydeBenzenecarboxaldehydePhenylmethanalArtificial almond oil |
| CAS Number | 100-52-7 |
| Appearance | Colorless to pale yellow liquid with a characteristic bitter almond odor. Oily consistency at room temperature. |
| Flash Point | 63C (145F) |
| Boiling Point | 179C (354F) |
| Vapor Density | 3.7 (heavier than air) |
| Water Reactivity | Insoluble in water; no significant reaction |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1990
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical, water spray
PPE Requirements
⚠️ Level B minimum for spills; SCBA and chemical-resistant suit recommended for large releases or fire conditions
Isolation & Evacuation
ERG 171: isolate spill 25m in all directions; for large spills consider initial downwind evacuation 100m
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 171).
First Actions for a UN 1990 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 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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📋 Copy & Share Field Card
UN 1990 — BenzaldehydeHAZMAT RADIO NOTE — UN 1990
Product: Benzaldehyde
Class 9 / Miscellaneous / ERG 171
PPE: Level B minimum for spills; SCBA and chemical-resistant suit recommended for large releases or fire conditions
ISOLATION: ERG 171: isolate spill 25m in all directions; for large spills consider initial downwind evacuation 100m
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 1990 — Benzaldehyde
Class: 9 | Placard: Miscellaneous | ERG Guide: 171
Appearance: Colorless to pale yellow liquid with a characteristic bitter almond odor. Oily consistency at room temperature.
Water Reactivity: Insoluble in water; no significant reaction
Extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray
PPE: Level B minimum for spills; SCBA and chemical-resistant suit recommended for large releases or fire conditions
Isolation: ERG 171: isolate spill 25m in all directions; for large spills consider initial downwind evacuation 100m
— Key Hazards —
• Some may burn but none ignite readily.
• Containers may explode when heated.
• Some may be transported hot.
— 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 in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
SOURCE: allfirefighter.com/hazmat/un/1990 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1990 Benzaldehyde Cls9 ERG171 | ERG 171: isolate spill 25m in all directions; for large spills consider initial | allfirefighter.com/hazmat/un/1990SMS / 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/1990
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Frequently Asked Questions about UN 1990
Some may burn but none ignite readily. Containers may explode when heated. Some may be transported hot. For UN3508, Capacitor, asymmetric, be aware of possible short circuiting as this product is transported Polymeric beads, expandable (UN2211) may evolve flammable vapours. Inhalation of material may be harmful. Contact may cause burns to skin and eyes. Inhalation of Asbestos dust may have a damaging effect on the lungs.
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 B minimum for spills; SCBA and chemical-resistant suit recommended for large releases or fire conditions
Water reactivity: Insoluble in water; no significant reaction. Recommended extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray.
ERG Guide 171 recommendation: ERG 171: isolate spill 25m in all directions; for large spills consider initial downwind evacuation 100m
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 171 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.