☣️ UN 1612 • CLASS 2
Hexaethyl tetraphosphate and compressed gas mixture
Placard: Toxic Gas. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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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Quick details
UN 1612
Class: 2
Placard type: Toxic Gas
ERG: Guide 123 (check current ERG)
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
Chemical & Response Details
| 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 |
| 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 |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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
First actions (field-minded)
- 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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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.
=== 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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FAQ
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
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.