☣️ 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.
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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
| 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
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
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Many gases are heavier than air and will spread along the ground and collect in low or confined areas
- 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 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 —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Many gases are heavier than air and will spread along the ground and collect in low or confined areas
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. Full chemical + response details.
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. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/1612
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Frequently Asked Questions about 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
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 A required; full encapsulating suit with SCBA; chemical-resistant gloves; organophosphate cholinesterase inhibitor antidote kits on-site
Water reactivity: Hydrolyzes slowly in water; avoid prolonged contact with moisture. Recommended extinguishing: Dry chemical, CO2, or water spray; avoid direct water streams on liquid.
ERG Guide 123 recommendation: 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
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 123 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.