☣️ UN 1594 • CLASS 6
Diethyl sulphate
Placard: Toxic. 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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Quick details
UN 1594
Class: 6
Placard type: Toxic
ERG: Guide 152 (check current ERG)
Isolation: ERG 152: isolate spill 50m all directions; for large spill isolate 150m, downwind 300m; evacuate immediate area if fire
Chemical & Response Details
| Also known as | Diethyl sulfateEthyl sulfateDESSulfuric acid diethyl ester |
| CAS Number | 64-67-5 |
| Appearance | Colorless to pale yellow oily liquid with a faint peppermint-like odor. Dense and slowly decomposes in water. |
| Flash Point | 104C (220F) |
| Boiling Point | 209C (408F) - decomposes |
| Vapor Density | 5.3 (heavier than air) |
| Water Reactivity | Slowly hydrolyzes in water producing sulfuric acid and ethanol; reaction accelerates with heat |
| Extinguishing | Alcohol-resistant foam, CO2, dry chemical; water spray for cooling only |
| PPE | ⚠️ Level A required for spill response; SCBA mandatory; fully encapsulating chemical protective suit; highly toxic through all exposure routes |
| Isolation | ERG 152: isolate spill 50m all directions; for large spill isolate 150m, downwind 300m; evacuate immediate area if fire |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
- 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.
- Containers may explode when heated.
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
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.
- 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
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UN 1594 — Diethyl sulphate HAZMAT RADIO NOTE — UN 1594
Product: Diethyl sulphate
Class 6 / Toxic / ERG 152
PPE: Level A required for spill response; SCBA mandatory; fully encapsulating chemical protective suit; highly toxic through all exposure routes
ISOLATION: ERG 152: isolate spill 50m all directions; for large spill isolate 150m, downwind 300m; evacuate immediate area if 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 1594 — Diethyl sulphate
Class: 6 | Placard: Toxic | ERG Guide: 152
Appearance: Colorless to pale yellow oily liquid with a faint peppermint-like odor. Dense and slowly decomposes in water.
Water Reactivity: Slowly hydrolyzes in water producing sulfuric acid and ethanol; reaction accelerates with heat
Extinguishing: Alcohol-resistant foam, CO2, dry chemical; water spray for cooling only
PPE: Level A required for spill response; SCBA mandatory; fully encapsulating chemical protective suit; highly toxic through all exposure routes
Isolation: ERG 152: isolate spill 50m all directions; for large spill isolate 150m, downwind 300m; evacuate immediate area if fire
— Key Hazards —
• Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
• Contact with molten substance may cause severe burns to skin and eyes.
• Avoid any skin contact.
— 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.
• 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/1594 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1594 Diethyl sulphate Cls6 ERG152 | ERG 152: isolate spill 50m all directions; for large spill isolate 150m, downwin | allfirefighter.com/hazmat/un/1594SMS / 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/1594
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FAQ
Highly toxic, may be fatal if inhaled, ingested or absorbed through skin. 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. Containers may explode when heated. Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
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 for spill response; SCBA mandatory; fully encapsulating chemical protective suit; highly toxic through all exposure routes
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 152 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.