☣️ UN 1433 • CLASS 4
Stannic phosphides
Placard: Dangerous When Wet. 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 1433
Class: 4
Placard type: Dangerous When Wet
ERG: Guide 139 (check current ERG)
Isolation: ERG 139: Isolate spill 50m all directions; isolate fire area 800m all directions; consider evacuation 800m downwind if fire or material decomposing
Chemical & Response Details
| Also known as | Tin phosphidesTin(IV) phosphidesStannic phosphideTin tetraphosphide |
| Appearance | Gray to dark gray solid powder or crystalline material. Odorless when dry, may emit phosphine gas odor (garlic-like or fishy) when exposed to moisture. |
| Flash Point | Not applicable (water-reactive solid that produces flammable gas) |
| Boiling Point | Not applicable (decomposes on heating) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Reacts vigorously with water producing toxic and flammable phosphine gas (PH3). May ignite spontaneously on contact with moist air or water. |
| Extinguishing | Dry sand, dry chemical, soda ash. DO NOT use water, foam, or CO2. |
| PPE | ⚠️ Level A required for spill response; SCBA mandatory; chemical-resistant suit; avoid all contact with water or moisture |
| Isolation | ERG 139: Isolate spill 50m all directions; isolate fire area 800m all directions; consider evacuation 800m downwind if fire or material decomposing |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Produce flammable and toxic gases on contact with water.
- May ignite on contact with water or moist air.
- Some react vigorously or explosively on contact with water.
- May be ignited by heat, sparks or flames.
- May re-ignite after fire is extinguished.
- Some are transported in highly flammable liquids.
- Containers may explode when heated.
- Runoff may create fire or explosion hazard.
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 1433 — Stannic phosphides HAZMAT RADIO NOTE — UN 1433
Product: Stannic phosphides
Class 4 / Dangerous When Wet / ERG 139
PPE: Level A required for spill response; SCBA mandatory; chemical-resistant suit; avoid all contact with water or moisture
ISOLATION: ERG 139: Isolate spill 50m all directions; isolate fire area 800m all directions; consider evacuation 800m downwind if fire or material decomposing
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 1433 — Stannic phosphides
Class: 4 | Placard: Dangerous When Wet | ERG Guide: 139
Appearance: Gray to dark gray solid powder or crystalline material. Odorless when dry, may emit phosphine gas odor (garlic-like or fishy) when exposed to moisture.
Water Reactivity: Reacts vigorously with water producing toxic and flammable phosphine gas (PH3). May ignite spontaneously on contact with moist air or water.
Extinguishing: Dry sand, dry chemical, soda ash. DO NOT use water, foam, or CO2.
PPE: Level A required for spill response; SCBA mandatory; chemical-resistant suit; avoid all contact with water or moisture
Isolation: ERG 139: Isolate spill 50m all directions; isolate fire area 800m all directions; consider evacuation 800m downwind if fire or material decomposing
— Key Hazards —
• Produce flammable and toxic gases on contact with water.
• May ignite on contact with water or moist air.
• Some react vigorously or explosively on contact with water.
— 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/1433 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1433 Stannic phosphides Cls4 ERG139 | ERG 139: Isolate spill 50m all directions; isolate fire area 800m all directions | allfirefighter.com/hazmat/un/1433SMS / 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/1433
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FAQ
Produce flammable and toxic gases on contact with water. May ignite on contact with water or moist air. Some react vigorously or explosively on contact with water. May be ignited by heat, sparks or flames. May re-ignite after fire is extinguished. Some are transported in highly flammable liquids. Containers may explode when heated. Runoff may create fire or explosion hazard.
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 A required for spill response; SCBA mandatory; chemical-resistant suit; avoid all contact with water or moisture
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 139 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.