☣️ 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 asHETPHexaethyl tetraphosphateTetraphosphoric acid hexaethyl esterBladan
CAS Number757-58-4
AppearanceColorless 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 PointNot applicable (compressed gas mixture)
Boiling PointNot applicable (compressed gas mixture under pressure)
Vapor DensityHeavier than air (organic phosphate component)
Water ReactivityHydrolyzes 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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📋 Copy & Share Field Card

UN 1612 — Hexaethyl tetraphosphate and compressed
HAZMAT 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.

SMS WhatsApp
=== 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.

SMS (short)
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

Related UN Numbers in Class 2

Discovery block for training / quick reference. Always consult the current ERG + your SOP/SOG for operations.
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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.