☣️ UN 2674 • CLASS 6
Sodium fluorosilicate
Placard: Toxic. 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 2674
Class: 6
Placard type: Toxic
ERG: Guide 154 (check current ERG)
Isolation: ERG 154: Initial isolation 25m in all directions. Protective action distance 0.1km downwind for small spills, 0.3km for large spills during daytime.
Chemical & Response Details
| Also known as | Disodium hexafluorosilicateDisodium silicon hexafluorideSodium silicofluorideSalufer |
| CAS Number | 16893-85-9 |
| Appearance | White odorless crystalline powder or granular solid at room temperature. May appear as small crystals or dust. |
| Flash Point | Not applicable (non-combustible inorganic solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid, non-volatile at ambient conditions) |
| Water Reactivity | Slowly soluble in water; hydrolyzes to release hydrofluoric acid in acidic conditions. Avoid contact with acids. |
| Extinguishing | Dry chemical, sand, or dry earth for spills. Water spray may be used to reduce dust or dilute spills if necessary. |
| PPE | ⚠️ Level B minimum recommended. SCBA required in enclosed spaces or high dust concentrations. Chemical-resistant gloves, boots, and full body protection required to prevent skin contact. |
| Isolation | ERG 154: Initial isolation 25m in all directions. Protective action distance 0.1km downwind for small spills, 0.3km for large spills during daytime. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
- 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
- Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive
- Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.).
- Corrosives in contact with metals may evolve flammable hydrogen gas.
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.
- 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
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UN 2674 — Sodium fluorosilicate HAZMAT RADIO NOTE — UN 2674
Product: Sodium fluorosilicate
Class 6 / Toxic / ERG 154
PPE: Level B minimum recommended. SCBA required in enclosed spaces or high dust concentrations. Chemical-resistant gloves, boots, and full body protection required to prevent skin contact.
ISOLATION: ERG 154: Initial isolation 25m in all directions. Protective action distance 0.1km downwind for small spills, 0.3km for large spills during daytime.
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 2674 — Sodium fluorosilicate
Class: 6 | Placard: Toxic | ERG Guide: 154
Appearance: White odorless crystalline powder or granular solid at room temperature. May appear as small crystals or dust.
Water Reactivity: Slowly soluble in water; hydrolyzes to release hydrofluoric acid in acidic conditions. Avoid contact with acids.
Extinguishing: Dry chemical, sand, or dry earth for spills. Water spray may be used to reduce dust or dilute spills if necessary.
PPE: Level B minimum recommended. SCBA required in enclosed spaces or high dust concentrations. Chemical-resistant gloves, boots, and full body protection required to prevent skin contact.
Isolation: ERG 154: Initial isolation 25m in all directions. Protective action distance 0.1km downwind for small spills, 0.3km for large spills during daytime.
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
• 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.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/2674 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2674 Sodium fluorosilicate Cls6 ERG154 | ERG 154: Initial isolation 25m in all directions. Protective action distance 0.1 | allfirefighter.com/hazmat/un/2674SMS / 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/2674
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FAQ
TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury 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 Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Corrosives in contact with metals may evolve flammable hydrogen gas.
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 B minimum recommended. SCBA required in enclosed spaces or high dust concentrations. Chemical-resistant gloves, boots, and full body protection required to prevent skin contact.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 154 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.