☣️ UN 2830 • CLASS 4
Lithium ferrosilicon
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 2830
Class: 4
Placard type: Dangerous When Wet
ERG: Guide 139 (check current ERG)
Isolation: ERG 139: Initial isolation 100m in all directions. Protective action distance 300m downwind during day, 800m at night if material is on fire or exposed to water.
Chemical & Response Details
| Also known as | Lithium ferrosiliconLithium iron silicon alloyFerrosilicon lithium |
| Appearance | Gray to dark gray metallic powder or granules. Odorless solid at room temperature. Pyrophoric material that may ignite spontaneously in air when finely divided. |
| Flash Point | Not applicable (pyrophoric solid) |
| Boiling Point | Not applicable (decomposes/reacts before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Reacts violently with water producing flammable hydrogen gas and toxic lithium hydroxide. May ignite spontaneously. |
| Extinguishing | Dry sand, soda ash, dry chemical (Class D extinguisher for metal fires). DO NOT use water, foam, CO2, or halogenated agents. |
| PPE | ⚠️ Level B minimum with SCBA required. Chemical-resistant suit and gloves. Face shield and respiratory protection mandatory due to toxic gas generation. |
| Isolation | ERG 139: Initial isolation 100m in all directions. Protective action distance 300m downwind during day, 800m at night if material is on fire or exposed to water. |
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 2830 — Lithium ferrosilicon HAZMAT RADIO NOTE — UN 2830
Product: Lithium ferrosilicon
Class 4 / Dangerous When Wet / ERG 139
PPE: Level B minimum with SCBA required. Chemical-resistant suit and gloves. Face shield and respiratory protection mandatory due to toxic gas generation.
ISOLATION: ERG 139: Initial isolation 100m in all directions. Protective action distance 300m downwind during day, 800m at night if material is on fire or exposed to water.
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 2830 — Lithium ferrosilicon
Class: 4 | Placard: Dangerous When Wet | ERG Guide: 139
Appearance: Gray to dark gray metallic powder or granules. Odorless solid at room temperature. Pyrophoric material that may ignite spontaneously in air when finely divided.
Water Reactivity: Reacts violently with water producing flammable hydrogen gas and toxic lithium hydroxide. May ignite spontaneously.
Extinguishing: Dry sand, soda ash, dry chemical (Class D extinguisher for metal fires). DO NOT use water, foam, CO2, or halogenated agents.
PPE: Level B minimum with SCBA required. Chemical-resistant suit and gloves. Face shield and respiratory protection mandatory due to toxic gas generation.
Isolation: ERG 139: Initial isolation 100m in all directions. Protective action distance 300m downwind during day, 800m at night if material is on fire or exposed to water.
— 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/2830 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2830 Lithium ferrosilicon Cls4 ERG139 | ERG 139: Initial isolation 100m in all directions. Protective action distance 30 | allfirefighter.com/hazmat/un/2830SMS / 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/2830
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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 with SCBA required. Chemical-resistant suit and gloves. Face shield and respiratory protection mandatory due to toxic gas generation.
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.