☣️ UN 2987 • CLASS 8
UN 2987 — Chlorosilanes, corrosive, n.o.s.
Placard: Corrosive. ERG Guide 156. 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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UN 2987 Quick Details
UN 2987
Product name: Chlorosilanes, corrosive, n.o.s.
DOT Class: 8
Placard type: Corrosive
ERG Guide: 156 (check current ERG)
Initial isolation: ERG 156: Small spill isolate 30m all directions. Large spill isolate 150m all directions. Fire: evacuate 800m downwind if tank/rail car involved.
Common Hazards of UN 2987
- Combustible material: may burn but does not ignite readily.
- Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff.
- When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
- 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.
- Corrosives in contact with metals may evolve flammable hydrogen gas.
- Containers may explode when heated or if contaminated with water.
- TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance
Chemical Identity & Physical Properties
| Also known as | Chlorosilanes N.O.S.Corrosive chlorosilanesOrganosilicon chloridesSilicon chloride derivatives |
| Appearance | Colorless to pale yellow liquids with pungent, acrid odor. May fume in moist air due to reaction with atmospheric moisture. |
| Flash Point | Variable, typically -18C to 38C (0F to 100F) depending on specific chlorosilane |
| Boiling Point | Variable, typically 30C to 150C (86F to 302F) depending on molecular structure |
| Vapor Density | 3-5 (heavier than air, vapors accumulate in low areas) |
| Water Reactivity | Reacts violently with water releasing flammable hydrogen gas and corrosive hydrogen chloride fumes. Do not use water directly on material. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2987
Extinguishing Media
Dry chemical, CO2, dry sand. Do not use water or aqueous foam. Use dry extinguishing agents only.
PPE Requirements
⚠️ Level B minimum with SCBA required. Full face respirator, chemical-resistant suit, gloves, and boots. Avoid all skin and eye contact due to severe corrosive properties.
Isolation & Evacuation
ERG 156: Small spill isolate 30m all directions. Large spill isolate 150m all directions. Fire: evacuate 800m downwind if tank/rail car involved.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 156).
First Actions for a UN 2987 Incident
- 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 2987 — Chlorosilanes, corrosive, n.o.s.HAZMAT RADIO NOTE — UN 2987
Product: Chlorosilanes, corrosive, n.o.s.
Class 8 / Corrosive / ERG 156
PPE: Level B minimum with SCBA required. Full face respirator, chemical-resistant suit, gloves, and boots. Avoid all skin and eye contact due to severe corrosive properties.
ISOLATION: ERG 156: Small spill isolate 30m all directions. Large spill isolate 150m all directions. Fire: evacuate 800m downwind if tank/rail car involved.
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 2987 — Chlorosilanes, corrosive, n.o.s.
Class: 8 | Placard: Corrosive | ERG Guide: 156
Appearance: Colorless to pale yellow liquids with pungent, acrid odor. May fume in moist air due to reaction with atmospheric moisture.
Water Reactivity: Reacts violently with water releasing flammable hydrogen gas and corrosive hydrogen chloride fumes. Do not use water directly on material.
Extinguishing: Dry chemical, CO2, dry sand. Do not use water or aqueous foam. Use dry extinguishing agents only.
PPE: Level B minimum with SCBA required. Full face respirator, chemical-resistant suit, gloves, and boots. Avoid all skin and eye contact due to severe corrosive properties.
Isolation: ERG 156: Small spill isolate 30m all directions. Large spill isolate 150m all directions. Fire: evacuate 800m downwind if tank/rail car involved.
— Key Hazards —
• Combustible material: may burn but does not ignite readily.
• Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff.
• When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
— 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/2987 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2987 Chlorosilanes, corrosive, n.o.s. Cls8 ERG156 | allfirefighter.com/hazmat/un/2987SMS / 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/2987
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Frequently Asked Questions about UN 2987
Combustible material: may burn but does not ignite readily. Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff. When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion 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. Corrosives in contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water. TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance
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. Full face respirator, chemical-resistant suit, gloves, and boots. Avoid all skin and eye contact due to severe corrosive properties.
Water reactivity: Reacts violently with water releasing flammable hydrogen gas and corrosive hydrogen chloride fumes. Do not use water directly on material.. Recommended extinguishing: Dry chemical, CO2, dry sand. Do not use water or aqueous foam. Use dry extinguishing agents only..
ERG Guide 156 recommendation: ERG 156: Small spill isolate 30m all directions. Large spill isolate 150m all directions. Fire: evacuate 800m downwind if tank/rail car involved.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 156 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.