☣️ UN 1718 • CLASS 8
UN 1718 — Acid butyl phosphate
Placard: Corrosive. ERG Guide 153. 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.
Acid butyl phosphate is a highly toxic and corrosive substance that requires careful handling and emergency response. It is a clear to pale yellow liquid with a mild acidic odor.
Hazard overview: Acid butyl phosphate is a toxic and corrosive substance that may cause severe injury upon inhalation, ingestion or skin contact. Methyl bromoacetate (UN2643) is an eye irritant/lachrymator.
Response guidance: In case of emergency, isolate the spill area immediately for at least 50m in all directions. Use alcohol-resistant foam, dry chemical, or CO2 to extinguish fires, and avoid water jets but use water spray for cooling.
Advertisement
UN 1718 Quick Details
UN 1718
Product name: Acid butyl phosphate
DOT Class: 8
Placard type: Corrosive
ERG Guide: 153 (check current ERG)
Initial isolation: ERG 153: isolate spill 50m in all directions; evacuate 800m downwind if large spill; 1600m if tank/rail car involved in fire
Common Hazards of UN 1718
- TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
- Methyl bromoacetate (UN2643) is an eye irritant/lachrymator (causes flow of tears).
- Contact with molten substance may cause severe burns to skin and eyes.
- Avoid any skin contact.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental
- Combustible material: may burn but does not ignite readily.
- When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
Chemical Identity & Physical Properties
Acid butyl phosphate is a clear to pale yellow liquid with a mild acidic odor.
| Also known as | Butyl acid phosphateMonobutyl phosphateButyl dihydrogen phosphatePhosphoric acid butyl ester |
| CAS Number | 12788-93-1 |
| Appearance | Clear to pale yellow liquid with a mild acidic odor. Corrosive liquid at room temperature. |
| Flash Point | 110°C (230°F) |
| Boiling Point | Decomposes before boiling at approximately 200°C (392°F) |
| Vapor Density | Not applicable (low volatility liquid) |
| Water Reactivity | Soluble in water; may generate heat when dissolved but no violent reaction |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1718
Extinguishing Media
Alcohol-resistant foam, dry chemical, CO2; avoid water jets but water spray acceptable for cooling
PPE Requirements
⚠️ Level B minimum; SCBA required; chemical-resistant suit, gloves, and boots; face shield required for corrosive liquid contact
Level B minimum PPE with SCBA, chemical-resistant suit, gloves, and boots, and face shield required for corrosive liquid contact.
Isolation & Evacuation
ERG 153: isolate spill 50m in all directions; evacuate 800m downwind if large spill; 1600m if tank/rail car involved in fire
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 153).
First Actions for a UN 1718 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 in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- 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
Advertisement
📋 Copy & Share Field Card
UN 1718 — Acid butyl phosphateHAZMAT RADIO NOTE — UN 1718
Product: Acid butyl phosphate
Class 8 / Corrosive / ERG 153
PPE: Level B minimum; SCBA required; chemical-resistant suit, gloves, and boots; face shield required for corrosive liquid contact
ISOLATION: ERG 153: isolate spill 50m in all directions; evacuate 800m downwind if large spill; 1600m if tank/rail car involved in fire
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 1718 — Acid butyl phosphate
Class: 8 | Placard: Corrosive | ERG Guide: 153
Appearance: Clear to pale yellow liquid with a mild acidic odor. Corrosive liquid at room temperature.
Water Reactivity: Soluble in water; may generate heat when dissolved but no violent reaction
Extinguishing: Alcohol-resistant foam, dry chemical, CO2; avoid water jets but water spray acceptable for cooling
PPE: Level B minimum; SCBA required; chemical-resistant suit, gloves, and boots; face shield required for corrosive liquid contact
Isolation: ERG 153: isolate spill 50m in all directions; evacuate 800m downwind if large spill; 1600m if tank/rail car involved in fire
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
• Methyl bromoacetate (UN2643) is an eye irritant/lachrymator (causes flow of tears).
• Contact with molten substance may cause severe burns to skin and eyes.
— 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 in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
SOURCE: allfirefighter.com/hazmat/un/1718 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1718 Acid butyl phosphate Cls8 ERG153 | ERG 153: isolate spill 50m in all directions; evacuate 800m downwind if large sp | allfirefighter.com/hazmat/un/1718SMS / 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/acid-butyl-phosphate-un-1718
Advertisement
Frequently Asked Questions about UN 1718
Yes, Acid butyl phosphate is a toxic and corrosive substance that may cause severe injury upon inhalation, ingestion or skin contact.
Acid butyl phosphate is soluble in water and may generate heat when dissolved, but no violent reaction occurs.
Level B minimum PPE with SCBA, chemical-resistant suit, gloves, and boots, and face shield required for corrosive liquid contact.
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.