☣️ UN 2418 • CLASS 2
UN 2418 — Sulphur tetrafluoride
Placard: Toxic Gas. ERG Guide 125. 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 2418 Quick Details
UN 2418
Product name: Sulphur tetrafluoride
DOT Class: 2
Placard type: Toxic Gas
ERG Guide: 125 (check current ERG)
Initial isolation: ERG 125: Isolate spill/leak area immediately for at least 100m in all directions. Evacuate initial downwind area 800m during day, 1600m at night if tank/container involved in fire.
Common Hazards of UN 2418
- TOXIC and/or CORROSIVE; may be fatal if inhaled, ingested or absorbed through skin.
- Vapors are extremely irritating and 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.
- Some of these materials may react violently with water.
Chemical Identity & Physical Properties
| Also known as | Sulfur tetrafluorideTetrafluorosulfuraneSulfur fluorideSF4 |
| CAS Number | 7783-60-0 |
| Appearance | Colorless gas with a pungent, sulfur-like odor. Exists as a compressed liquefied gas under pressure at ambient temperature. |
| Flash Point | Not applicable (non-flammable gas) |
| Boiling Point | -38C (-36F) |
| Vapor Density | 3.72 (heavier than air) |
| Water Reactivity | Reacts violently with water producing highly toxic and corrosive hydrogen fluoride (HF) and sulfur dioxide (SO2). Do not use water directly on material. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2418
Extinguishing Media
Do not use water or foam. Use dry chemical or carbon dioxide if nearby fire requires extinguishing agent.
PPE Requirements
⚠️ Level A required for high concentrations or unknown exposures. SCBA with full face protection mandatory. Chemical-resistant suit, gloves, and boots required. Protect against both gas inhalation and liquid contact/frostbite.
Isolation & Evacuation
ERG 125: Isolate spill/leak area immediately for at least 100m in all directions. Evacuate initial downwind area 800m during day, 1600m at night if tank/container involved in fire.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 125).
First Actions for a UN 2418 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 2418 — Sulphur tetrafluorideHAZMAT RADIO NOTE — UN 2418
Product: Sulphur tetrafluoride
Class 2 / Toxic Gas / ERG 125
PPE: Level A required for high concentrations or unknown exposures. SCBA with full face protection mandatory. Chemical-resistant suit, gloves, and boots required. Protect against both gas inhalation and liquid contact/frostbite.
ISOLATION: ERG 125: Isolate spill/leak area immediately for at least 100m in all directions. Evacuate initial downwind area 800m during day, 1600m at night if tank/container 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 2418 — Sulphur tetrafluoride
Class: 2 | Placard: Toxic Gas | ERG Guide: 125
Appearance: Colorless gas with a pungent, sulfur-like odor. Exists as a compressed liquefied gas under pressure at ambient temperature.
Water Reactivity: Reacts violently with water producing highly toxic and corrosive hydrogen fluoride (HF) and sulfur dioxide (SO2). Do not use water directly on material.
Extinguishing: Do not use water or foam. Use dry chemical or carbon dioxide if nearby fire requires extinguishing agent.
PPE: Level A required for high concentrations or unknown exposures. SCBA with full face protection mandatory. Chemical-resistant suit, gloves, and boots required. Protect against both gas inhalation and liquid contact/frostbite.
Isolation: ERG 125: Isolate spill/leak area immediately for at least 100m in all directions. Evacuate initial downwind area 800m during day, 1600m at night if tank/container involved in fire.
— Key Hazards —
• TOXIC and/or CORROSIVE; may be fatal if inhaled, ingested or absorbed through skin.
• Vapors are extremely irritating and 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/2418 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2418 Sulphur tetrafluoride Cls2 ERG125 | ERG 125: Isolate spill/leak area immediately for at least 100m in all directions | allfirefighter.com/hazmat/un/2418SMS / 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/2418
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Frequently Asked Questions about UN 2418
TOXIC and/or CORROSIVE; may be fatal if inhaled, ingested or absorbed through skin. Vapors are extremely irritating and 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. Some of these materials may react violently with water.
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 high concentrations or unknown exposures. SCBA with full face protection mandatory. Chemical-resistant suit, gloves, and boots required. Protect against both gas inhalation and liquid contact/frostbite.
Water reactivity: Reacts violently with water producing highly toxic and corrosive hydrogen fluoride (HF) and sulfur dioxide (SO2). Do not use water directly on material.. Recommended extinguishing: Do not use water or foam. Use dry chemical or carbon dioxide if nearby fire requires extinguishing agent..
ERG Guide 125 recommendation: ERG 125: Isolate spill/leak area immediately for at least 100m in all directions. Evacuate initial downwind area 800m during day, 1600m at night if tank/container involved in fire.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 125 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.