☣️ UN 3362 • CLASS 6
Chlorosilanes, poisonous, corrosive, flammable, n.o.s.
Placard: Toxic. 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 3362
Class: 6
Placard type: Toxic
ERG: Guide 155 (check current ERG)
Isolation: ERG 155: Isolate spill 50m in all directions. For fire, evacuate 800m downwind. Approach fire from upwind to avoid toxic vapors.
Chemical & Response Details
| Also known as | Chlorosilanes n.o.s.Flammable corrosive chlorosilanesToxic chlorosilane mixturesOrganosilicon chloride compounds |
| Appearance | Typically colorless to pale yellow liquids with pungent, irritating odor. Fumes heavily in moist air forming dense white vapors of hydrochloric acid. |
| Flash Point | -18C to 4C (0F to 39F) depending on specific chlorosilane |
| Boiling Point | 32C to 93C (90F to 199F) depending on specific chlorosilane |
| Vapor Density | 3.0-5.5 (much heavier than air) |
| Water Reactivity | Reacts violently with water producing heat and toxic/corrosive hydrogen chloride gas. Do not use water directly on material. |
| Extinguishing | Dry chemical, CO2, or dry sand only. Do not use water or foam. Use water spray to cool containers from maximum distance. |
| PPE | ⚠️ Level A required for spill response; SCBA and full chemical protective suit mandatory; material is toxic by inhalation, skin contact, and ingestion |
| Isolation | ERG 155: Isolate spill 50m in all directions. For fire, evacuate 800m downwind. Approach fire from upwind to avoid toxic vapors. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
- Vapors form explosive mixtures with air: indoors, outdoors and sewers explosion hazards.
- Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas
- Vapors may travel to source of ignition and flash back.
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
- Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff.
- Corrosives in contact with metals may evolve flammable hydrogen gas.
- Containers may explode when heated or if contaminated with water.
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 3362 — Chlorosilanes, poisonous, corrosive, fla HAZMAT RADIO NOTE — UN 3362
Product: Chlorosilanes, poisonous, corrosive, flammable, n.o.s.
Class 6 / Toxic / ERG 155
PPE: Level A required for spill response; SCBA and full chemical protective suit mandatory; material is toxic by inhalation, skin contact, and ingestion
ISOLATION: ERG 155: Isolate spill 50m in all directions. For fire, evacuate 800m downwind. Approach fire from upwind to avoid toxic vapors.
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 3362 — Chlorosilanes, poisonous, corrosive, flammable, n.o.s.
Class: 6 | Placard: Toxic | ERG Guide: 155
Appearance: Typically colorless to pale yellow liquids with pungent, irritating odor. Fumes heavily in moist air forming dense white vapors of hydrochloric acid.
Water Reactivity: Reacts violently with water producing heat and toxic/corrosive hydrogen chloride gas. Do not use water directly on material.
Extinguishing: Dry chemical, CO2, or dry sand only. Do not use water or foam. Use water spray to cool containers from maximum distance.
PPE: Level A required for spill response; SCBA and full chemical protective suit mandatory; material is toxic by inhalation, skin contact, and ingestion
Isolation: ERG 155: Isolate spill 50m in all directions. For fire, evacuate 800m downwind. Approach fire from upwind to avoid toxic vapors.
— Key Hazards —
• HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
• Vapors form explosive mixtures with air: indoors, outdoors and sewers explosion hazards.
• Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas
— 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/3362 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3362 Chlorosilanes, poisonous, corrosive, flammable, n.o.s. Cls6 ERG155 | allfirefighter.com/hazmat/un/3362SMS / 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/3362
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FAQ
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors form explosive mixtures with air: indoors, outdoors and sewers explosion hazards. Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas Vapors may travel to source of ignition and flash back. Those substances designated with a (P) may polymerize explosively when heated or involved in a fire. Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff. Corrosives in contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water.
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 and full chemical protective suit mandatory; material is toxic by inhalation, skin contact, and ingestion
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 155 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.