☣️ UN 1908 • CLASS 8
Chlorite solution
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 1908
Class: 8
Placard type: Corrosive
ERG: Guide 154 (check current ERG)
Isolation: ERG 154: isolate spill 50m all directions; for large spill isolate 100m, evacuate 500m downwind if no fire
Chemical & Response Details
| Also known as | Sodium chlorite solutionChlorous acid sodium salt solutionTextoneChlorite liquor |
| CAS Number | 7758-19-2 |
| Appearance | Clear to slightly yellow-green liquid with a faint chlorine-like odor. Aqueous solution of an oxidizing salt, typically 25-40% concentration. |
| Flash Point | Not applicable (non-flammable aqueous solution) |
| Boiling Point | Approximately 100C (212F), similar to water |
| Vapor Density | Not applicable (aqueous solution) |
| Water Reactivity | Dilutes with water; avoid contact with acids which can release toxic chlorine dioxide gas |
| Extinguishing | Water spray, fog, or mist preferred; compatible with alcohol-resistant foam if needed |
| PPE | ⚠️ Level B minimum with SCBA; full face shield, chemical-resistant gloves and suit; avoid all skin contact due to corrosive nature |
| Isolation | ERG 154: isolate spill 50m all directions; for large spill isolate 100m, evacuate 500m downwind if no fire |
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 1908 — Chlorite solution HAZMAT RADIO NOTE — UN 1908
Product: Chlorite solution
Class 8 / Corrosive / ERG 154
PPE: Level B minimum with SCBA; full face shield, chemical-resistant gloves and suit; avoid all skin contact due to corrosive nature
ISOLATION: ERG 154: isolate spill 50m all directions; for large spill isolate 100m, evacuate 500m downwind if no 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 1908 — Chlorite solution
Class: 8 | Placard: Corrosive | ERG Guide: 154
Appearance: Clear to slightly yellow-green liquid with a faint chlorine-like odor. Aqueous solution of an oxidizing salt, typically 25-40% concentration.
Water Reactivity: Dilutes with water; avoid contact with acids which can release toxic chlorine dioxide gas
Extinguishing: Water spray, fog, or mist preferred; compatible with alcohol-resistant foam if needed
PPE: Level B minimum with SCBA; full face shield, chemical-resistant gloves and suit; avoid all skin contact due to corrosive nature
Isolation: ERG 154: isolate spill 50m all directions; for large spill isolate 100m, evacuate 500m downwind if no fire
— 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/1908 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1908 Chlorite solution Cls8 ERG154 | ERG 154: isolate spill 50m all directions; for large spill isolate 100m, evacuat | allfirefighter.com/hazmat/un/1908SMS / 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/1908
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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 with SCBA; full face shield, chemical-resistant gloves and suit; avoid all skin contact due to corrosive nature
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.