UN 2689 — Glycerol alphamonochlorohydrin
Placard: Toxic. ERG Guide 153. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
Glycerol alphamonochlorohydrin is a toxic, corrosive viscous liquid. It is water-miscible and requires strict control of skin contact and inhalation exposure.
Hazard overview: Glycerol alphamonochlorohydrin is a toxic material requiring control of inhalation, ingestion and skin exposure. Fire or heating can increase toxic vapor, dust or smoke hazards.
Response guidance: Isolate the release, keep personnel upwind and prevent contact with liquid, solid or runoff. Use Alcohol-resistant foam, CO2, dry chemical, water spray as appropriate for fire, while protecting waterways.
Firefighter training notes: Train crews to identify Glycerol alphamonochlorohydrin by UN number, placard, ERG guide and SDS before choosing entry, isolation or extinguishment tactics.
Regulatory context: Use UN 2689, ERG 153, SDS, container labels and shipping papers to confirm the exact hazard profile and protective action distances.
Storage & handling: Store in closed, compatible containers away from heat, ignition sources and incompatible materials; keep the area ventilated and protected from damage.
UN 2689 Quick Details
Common Hazards of UN 2689
- Toxic exposure by inhalation, ingestion or skin contact may cause serious injury.
- Contact can irritate or burn skin and eyes; avoid all unnecessary contact.
- Fire may generate irritating, corrosive or toxic gases.
- Combustible material may burn, although it may not ignite readily.
- Contaminated runoff may be toxic or corrosive and should be contained.
- Vapors, dust or aerosols can be more hazardous in confined or poorly ventilated areas.
- Heated containers may rupture or release hazardous vapors.
Chemical Identity & Physical Properties
Colorless to pale yellow viscous liquid with a faint sweet odor; denser than water and miscible with water and alcohols.
| Also known as | 3-Chloropropane-1,2-diol3-Chloro-1,2-propanediol1-Chloro-2,3-propanediolChlorohydrin3-MCPD |
| CAS Number | 96-24-2 |
| Appearance | Colorless to pale yellow viscous liquid with a faint sweet odor. Denser than water and miscible with water and alcohols. |
| Flash Point | 165°C (329°F) |
| Boiling Point | 213°C (415°F) at 760 mmHg, decomposes |
| Vapor Density | 3.9 (heavier than air) |
| Water Reactivity | No significant reaction with water; miscible with water |
Fireground Response Guidance — UN 2689
Extinguishing Media
PPE Requirements
Use SCBA with chemical-resistant gloves, boots and protective clothing; upgrade to full chemical protection when contact or vapor levels are uncertain.
Isolation & Evacuation
First Actions for a UN 2689 Incident
- Call 911 and the emergency response number shown on shipping papers or container documents.
- Keep unauthorized personnel away and establish an initial isolation perimeter.
- Stay upwind, uphill and upstream; avoid low areas where vapors or runoff may collect.
- Avoid breathing vapors, dust, smoke or mist and prevent skin and eye contact.
- Do not touch damaged containers or spilled material without appropriate chemical PPE.
- Ventilate confined spaces only when personnel are trained, monitored and properly equipped.
- Use ERG guidance, SDS, shipping papers and air monitoring before committing crews.
📋 Copy & Share Field Card
UN 2689 — Glycerol alphamonochlorohydrinUse for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.