☣️ UN 2989 • CLASS 4
Lead phosphite, dibasic
Placard: Flammable Solid. 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 2989
Class: 4
Placard type: Flammable Solid
ERG: Guide 133 (check current ERG)
Isolation: ERG 133: isolate spill 25m all directions; if fire, isolate 800m and consider evacuation
Chemical & Response Details
| Also known as | Dibasic lead phosphiteLead hydrogen phosphiteLead orthophosphite dibasicPhosphorous acid lead(2+) salt dibasic |
| CAS Number | 12141-20-7 |
| Appearance | White to off-white crystalline powder or granular solid with no distinctive odor. Stable at room temperature in dry conditions. |
| Flash Point | Not applicable (solid) |
| Boiling Point | Not applicable (decomposes before melting) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | May react slowly with water producing phosphine gas; avoid moisture |
| Extinguishing | Dry chemical, dry sand, soda ash; do not use water or foam |
| PPE | ⚠️ Level C minimum with full face respirator; SCBA if fire involved or confined space |
| Isolation | ERG 133: isolate spill 25m all directions; if fire, isolate 800m and consider evacuation |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Flammable/combustible material.
- May be ignited by friction, heat, sparks or flames.
- Some may burn rapidly with flare-burning effect.
- Powders, dusts, shavings, borings, turnings or cuttings may explode or burn with explosive violence.
- Substance may be transported in a molten form at a temperature that may be above its flash point.
- May re-ignite after fire is extinguished.
- Fire may produce irritating and/or toxic gases.
- Contact may cause burns to skin and eyes.
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.
- Isolate spill or leak area for at least 25 meters (75 feet) in all directions.
- Consider initial downwind evacuation for at least 100 meters (330 feet).
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UN 2989 — Lead phosphite, dibasic HAZMAT RADIO NOTE — UN 2989
Product: Lead phosphite, dibasic
Class 4 / Flammable Solid / ERG 133
PPE: Level C minimum with full face respirator; SCBA if fire involved or confined space
ISOLATION: ERG 133: isolate spill 25m all directions; if fire, isolate 800m and consider evacuation
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 2989 — Lead phosphite, dibasic
Class: 4 | Placard: Flammable Solid | ERG Guide: 133
Appearance: White to off-white crystalline powder or granular solid with no distinctive odor. Stable at room temperature in dry conditions.
Water Reactivity: May react slowly with water producing phosphine gas; avoid moisture
Extinguishing: Dry chemical, dry sand, soda ash; do not use water or foam
PPE: Level C minimum with full face respirator; SCBA if fire involved or confined space
Isolation: ERG 133: isolate spill 25m all directions; if fire, isolate 800m and consider evacuation
— Key Hazards —
• Flammable/combustible material.
• May be ignited by friction, heat, sparks or flames.
• Some may burn rapidly with flare-burning effect.
— 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 for at least 25 meters (75 feet) in all directions.
SOURCE: allfirefighter.com/hazmat/un/2989 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2989 Lead phosphite, dibasic Cls4 ERG133 | allfirefighter.com/hazmat/un/2989SMS / 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/2989
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FAQ
Flammable/combustible material. May be ignited by friction, heat, sparks or flames. Some may burn rapidly with flare-burning effect. Powders, dusts, shavings, borings, turnings or cuttings may explode or burn with explosive violence. Substance may be transported in a molten form at a temperature that may be above its flash point. May re-ignite after fire is extinguished. Fire may produce irritating and/or toxic gases. Contact may cause burns to skin and eyes.
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 C minimum with full face respirator; SCBA if fire involved or confined space
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 133 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.