☣️ UN 1395 • CLASS 4
Aluminum ferrosilicon powder
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 1395
Class: 4
Placard type: Dangerous When Wet
ERG: Guide 139 (check current ERG)
Isolation: ERG 139: isolate 100m all directions; if fire or water exposure, isolate 800m and evacuate 1600m downwind
Chemical & Response Details
| Also known as | Ferrosilicon aluminum alloy powderAluminum-ferrosilicon powderAl-FeSi powder |
| Appearance | Gray to dark gray metallic powder with no distinctive odor. Solid at room temperature. |
| Flash Point | Not applicable (pyrophoric solid) |
| Boiling Point | Not applicable (decomposes) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Reacts with water producing flammable hydrogen gas and toxic fumes; may ignite spontaneously |
| Extinguishing | Dry sand, dry chemical, soda ash; DO NOT use water or foam |
| PPE | ⚠️ Level B minimum; SCBA required; chemical-resistant gloves and boots; avoid moisture exposure |
| Isolation | ERG 139: isolate 100m all directions; if fire or water exposure, isolate 800m and evacuate 1600m downwind |
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 1395 — Aluminum ferrosilicon powder HAZMAT RADIO NOTE — UN 1395
Product: Aluminum ferrosilicon powder
Class 4 / Dangerous When Wet / ERG 139
PPE: Level B minimum; SCBA required; chemical-resistant gloves and boots; avoid moisture exposure
ISOLATION: ERG 139: isolate 100m all directions; if fire or water exposure, isolate 800m and evacuate 1600m 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 1395 — Aluminum ferrosilicon powder
Class: 4 | Placard: Dangerous When Wet | ERG Guide: 139
Appearance: Gray to dark gray metallic powder with no distinctive odor. Solid at room temperature.
Water Reactivity: Reacts with water producing flammable hydrogen gas and toxic fumes; may ignite spontaneously
Extinguishing: Dry sand, dry chemical, soda ash; DO NOT use water or foam
PPE: Level B minimum; SCBA required; chemical-resistant gloves and boots; avoid moisture exposure
Isolation: ERG 139: isolate 100m all directions; if fire or water exposure, isolate 800m and evacuate 1600m downwind
— 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/1395 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1395 Aluminum ferrosilicon powder Cls4 ERG139 | allfirefighter.com/hazmat/un/1395SMS / 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/1395
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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 B minimum; SCBA required; chemical-resistant gloves and boots; avoid moisture exposure
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.