☣️ UN 2678 • CLASS 8
Rubidium hydroxide, solid
Placard: Corrosive. 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 2678
Class: 8
Placard type: Corrosive
ERG: Guide 154 (check current ERG)
Isolation: ERG 154: isolate spill 25m all directions; for large spill isolate 50m; evacuate immediate area if fire involves containers
Chemical & Response Details
| Also known as | Rubidium hydroxideRubidium hydrateRubidium(I) hydroxideRbOH |
| CAS Number | 1310-82-3 |
| Appearance | White to grayish-white crystalline solid or pellets. Odorless. Hygroscopic (absorbs moisture from air). Highly caustic alkali metal hydroxide. |
| Flash Point | Not applicable (non-combustible solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Dissolves exothermically in water generating significant heat; may cause spattering or steam generation. Forms strongly alkaline corrosive solution. |
| Extinguishing | Dry sand, soda ash, lime; avoid water except for large fires where water spray may be used from distance |
| PPE | ⚠️ Level B minimum required; full face SCBA, chemical-resistant suit, gloves and boots; avoid all direct contact with material |
| Isolation | ERG 154: isolate spill 25m all directions; for large spill isolate 50m; evacuate immediate area if fire involves containers |
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 2678 — Rubidium hydroxide, solid HAZMAT RADIO NOTE — UN 2678
Product: Rubidium hydroxide, solid
Class 8 / Corrosive / ERG 154
PPE: Level B minimum required; full face SCBA, chemical-resistant suit, gloves and boots; avoid all direct contact with material
ISOLATION: ERG 154: isolate spill 25m all directions; for large spill isolate 50m; evacuate immediate area if fire involves containers
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 2678 — Rubidium hydroxide, solid
Class: 8 | Placard: Corrosive | ERG Guide: 154
Appearance: White to grayish-white crystalline solid or pellets. Odorless. Hygroscopic (absorbs moisture from air). Highly caustic alkali metal hydroxide.
Water Reactivity: Dissolves exothermically in water generating significant heat; may cause spattering or steam generation. Forms strongly alkaline corrosive solution.
Extinguishing: Dry sand, soda ash, lime; avoid water except for large fires where water spray may be used from distance
PPE: Level B minimum required; full face SCBA, chemical-resistant suit, gloves and boots; avoid all direct contact with material
Isolation: ERG 154: isolate spill 25m all directions; for large spill isolate 50m; evacuate immediate area if fire involves containers
— 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/2678 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2678 Rubidium hydroxide, solid Cls8 ERG154 | allfirefighter.com/hazmat/un/2678SMS / 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/2678
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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 required; full face SCBA, chemical-resistant suit, gloves and boots; avoid all direct contact with material
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.