☣️ UN 1612 • CLASS 2
UN 1612 — Hexaethyl tetraphosphate and compressed gas mixture
Placard: Toxic Gas. ERG Guide 123. 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.
Hexaethyl tetraphosphate and compressed gas mixture is a highly toxic substance that can cause severe health effects if not handled properly. It is a colorless to pale yellow liquid (pure HETP) compressed with gas.
Hazard overview: Hexaethyl tetraphosphate and compressed gas mixture is highly toxic and may be fatal if inhaled or absorbed through skin. Vapors may be irritating and/or corrosive.
Response guidance: In case of emergency, evacuate the area and call the fire department. Use dry chemical, CO2 or water spray to extinguish fires, but avoid direct water streams on liquid.
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UN 1612 Quick Details
UN 1612
Product name: Hexaethyl tetraphosphate and compressed gas mixture
DOT Class: 2
Placard type: Toxic Gas
ERG Guide: 123 (check current ERG)
Initial isolation: ERG 123: isolate spill/leak area immediately for at least 100m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider initial evacuation for 800m
Common Hazards of UN 1612
- TOXIC; may be fatal if inhaled or absorbed through skin.
- Vapors may be irritating and/or corrosive.
- Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
- Fire will produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may cause environmental contamination.
- Some may burn but none ignite readily.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
- Cylinders exposed to fire may vent and release toxic and/or corrosive gas through pressure relief
Chemical Identity & Physical Properties
Hexaethyl tetraphosphate and compressed gas mixture is a colorless to pale yellow liquid (pure HETP) compressed with gas, may have a faint fruity or ester-like odor, and liquefied gas mixture at room temperature under pressure.
| Also known as | HETPHexaethyl tetraphosphateTetraphosphoric acid hexaethyl esterBladan |
| CAS Number | 757-58-4 |
| Appearance | Colorless to pale yellow liquid (pure HETP) compressed with gas. May have a faint fruity or ester-like odor. Liquefied gas mixture at room temperature under pressure. |
| Flash Point | Not applicable (compressed gas mixture) |
| Boiling Point | Not applicable (compressed gas mixture under pressure) |
| Vapor Density | Heavier than air (organic phosphate component) |
| Water Reactivity | Hydrolyzes slowly in water; avoid prolonged contact with moisture |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1612
Extinguishing Media
Dry chemical, CO2, or water spray; avoid direct water streams on liquid
PPE Requirements
⚠️ Level A required; full encapsulating suit with SCBA; chemical-resistant gloves; organophosphate cholinesterase inhibitor antidote kits on-site
Level A PPE is required, including full encapsulating suit with SCBA, chemical-resistant gloves, and organophosphate cholinesterase inhibitor antidote kits on-site.
Isolation & Evacuation
ERG 123: isolate spill/leak area immediately for at least 100m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider initial evacuation for 800m
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 123).
First Actions for a UN 1612 Incident
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area for at least 100 meters (330 feet) in all directions.
- 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 1612 — Hexaethyl tetraphosphate and compressedHAZMAT RADIO NOTE — UN 1612
Product: Hexaethyl tetraphosphate and compressed gas mixture
Class 2 / Toxic Gas / ERG 123
PPE: Level A required; full encapsulating suit with SCBA; chemical-resistant gloves; organophosphate cholinesterase inhibitor antidote kits on-site
ISOLATION: ERG 123: isolate spill/leak area immediately for at least 100m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider initial evacuation for 800m
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 1612 — Hexaethyl tetraphosphate and compressed gas mixture
Class: 2 | Placard: Toxic Gas | ERG Guide: 123
Appearance: Colorless to pale yellow liquid (pure HETP) compressed with gas. May have a faint fruity or ester-like odor. Liquefied gas mixture at room temperature under pressure.
Water Reactivity: Hydrolyzes slowly in water; avoid prolonged contact with moisture
Extinguishing: Dry chemical, CO2, or water spray; avoid direct water streams on liquid
PPE: Level A required; full encapsulating suit with SCBA; chemical-resistant gloves; organophosphate cholinesterase inhibitor antidote kits on-site
Isolation: ERG 123: isolate spill/leak area immediately for at least 100m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider initial evacuation for 800m
— Key Hazards —
• TOXIC; may be fatal if inhaled or absorbed through skin.
• Vapors may be irritating and/or corrosive.
• Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
— First Actions —
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
• Isolate spill or leak area for at least 100 meters (330 feet) in all directions.
SOURCE: allfirefighter.com/hazmat/un/1612 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1612 Hexaethyl tetraphosphate and compressed gas mixture Cls2 ERG123 | allfirefighter.com/hazmat/un/1612SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/hexaethyl-tetraphosphate-and-compressed-un-1612
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Frequently Asked Questions about UN 1612
No
Yes
Level A PPE, including full encapsulating suit with SCBA, chemical-resistant gloves
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.