☣️ UN 2856 • CLASS 6
UN 2856 — Fluorosilicates, n.o.s.
Placard: Toxic. ERG Guide 151. 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 2856 Quick Details
UN 2856
Product name: Fluorosilicates, n.o.s.
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: isolate spill 25m all directions; large spill isolate 50m, consider evacuation 300m downwind
Common Hazards of UN 2856
- Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
- 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
- Containers may explode when heated.
- Runoff may pollute waterways.
Chemical Identity & Physical Properties
| Also known as | fluorosilicatessilicofluorideshexafluorosilicatesfluosilicates |
| Appearance | Typically white to off-white crystalline powders or granular solids. Odorless or slight chemical odor. Solid at room temperature. |
| Flash Point | Not applicable (non-flammable solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Slowly hydrolyzes in water releasing hydrofluoric acid; handle with care |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2856
Extinguishing Media
Dry chemical, soda ash, lime; avoid water spray directly on material
PPE Requirements
⚠️ Level B minimum; full face respirator with P100 filters or SCBA; chemical-resistant gloves and suit mandatory
Isolation & Evacuation
ERG 151: isolate spill 25m all directions; large spill isolate 50m, consider evacuation 300m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 2856 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.
- 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 2856 — Fluorosilicates, n.o.s.HAZMAT RADIO NOTE — UN 2856
Product: Fluorosilicates, n.o.s.
Class 6 / Toxic / ERG 151
PPE: Level B minimum; full face respirator with P100 filters or SCBA; chemical-resistant gloves and suit mandatory
ISOLATION: ERG 151: isolate spill 25m all directions; large spill isolate 50m, consider evacuation 300m downwind
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 2856 — Fluorosilicates, n.o.s.
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Typically white to off-white crystalline powders or granular solids. Odorless or slight chemical odor. Solid at room temperature.
Water Reactivity: Slowly hydrolyzes in water releasing hydrofluoric acid; handle with care
Extinguishing: Dry chemical, soda ash, lime; avoid water spray directly on material
PPE: Level B minimum; full face respirator with P100 filters or SCBA; chemical-resistant gloves and suit mandatory
Isolation: ERG 151: isolate spill 25m all directions; large spill isolate 50m, consider evacuation 300m downwind
— Key Hazards —
• Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
• Avoid any skin contact.
• Fire may produce irritating, corrosive and/or toxic gases.
— 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/2856 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2856 Fluorosilicates, n.o.s. Cls6 ERG151 | allfirefighter.com/hazmat/un/2856SMS / 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/2856
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Frequently Asked Questions about UN 2856
Highly toxic, may be fatal if inhaled, ingested or absorbed through skin. 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 Containers may explode when heated. Runoff may pollute waterways.
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; full face respirator with P100 filters or SCBA; chemical-resistant gloves and suit mandatory
Water reactivity: Slowly hydrolyzes in water releasing hydrofluoric acid; handle with care. Recommended extinguishing: Dry chemical, soda ash, lime; avoid water spray directly on material.
ERG Guide 151 recommendation: ERG 151: isolate spill 25m all directions; large spill isolate 50m, consider evacuation 300m downwind
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 151 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.