☣️ UN 1773 • CLASS 8
UN 1773 — Ferric chloride, anhydrous
Placard: Corrosive. ERG Guide 157. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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 1773 Quick Details
UN 1773
Product name: Ferric chloride, anhydrous
DOT Class: 8
Placard type: Corrosive
ERG Guide: 157 (check current ERG)
Initial isolation: ERG 157: isolate spill 25-50m all directions; large spill consider initial evacuation 100m downwind
Common Hazards of UN 1773
- TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance
- Reaction with water or moist air may release toxic, corrosive or flammable gases.
- Reaction with water may generate much heat that will increase the concentration of fumes in the air.
- Fire will produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental
- Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive
- UN1802, UN2032, UN3084, UN3093, UN1796 (above 50%), UN1826 (above 50%), and UN2031 (above
- Vapors may accumulate in confined areas (basement, tanks, hopper/tank cars, etc.).
Chemical Identity & Physical Properties
| Also known as | Iron(III) chlorideIron trichlorideFerric trichlorideFlores martis |
| CAS Number | 7705-08-0 |
| Appearance | Dark brown to black crystalline solid or reddish-brown lumps with a faint hydrochloric acid odor. Highly hygroscopic and deliquescent in moist air. |
| Flash Point | Not applicable (non-flammable inorganic solid) |
| Boiling Point | 316C (601F) with decomposition |
| Vapor Density | Not applicable (solid; however releases dense HCl vapors when exposed to moisture) |
| Water Reactivity | Reacts exothermically with water producing heat and corrosive hydrochloric acid fumes; violent reaction with moisture |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1773
Extinguishing Media
Dry chemical, dry sand, soda ash; do not use water or water-based agents
PPE Requirements
⚠️ Level B minimum; full-face SCBA, chemical-resistant suit, gloves and boots required; avoid moisture contact
Isolation & Evacuation
ERG 157: isolate spill 25-50m all directions; large spill consider initial evacuation 100m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 157).
First Actions for a UN 1773 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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📋 Copy & Share Field Card
UN 1773 — Ferric chloride, anhydrousHAZMAT RADIO NOTE — UN 1773
Product: Ferric chloride, anhydrous
Class 8 / Corrosive / ERG 157
PPE: Level B minimum; full-face SCBA, chemical-resistant suit, gloves and boots required; avoid moisture contact
ISOLATION: ERG 157: isolate spill 25-50m all directions; large spill consider initial evacuation 100m 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 1773 — Ferric chloride, anhydrous
Class: 8 | Placard: Corrosive | ERG Guide: 157
Appearance: Dark brown to black crystalline solid or reddish-brown lumps with a faint hydrochloric acid odor. Highly hygroscopic and deliquescent in moist air.
Water Reactivity: Reacts exothermically with water producing heat and corrosive hydrochloric acid fumes; violent reaction with moisture
Extinguishing: Dry chemical, dry sand, soda ash; do not use water or water-based agents
PPE: Level B minimum; full-face SCBA, chemical-resistant suit, gloves and boots required; avoid moisture contact
Isolation: ERG 157: isolate spill 25-50m all directions; large spill consider initial evacuation 100m downwind
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance
• Reaction with water or moist air may release toxic, corrosive or flammable gases.
• Reaction with water may generate much heat that will increase the concentration of fumes in the air.
— 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/1773 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1773 Ferric chloride, anhydrous Cls8 ERG157 | allfirefighter.com/hazmat/un/1773SMS / 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/1773
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Frequently Asked Questions about UN 1773
TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance Reaction with water or moist air may release toxic, corrosive or flammable gases. Reaction with water may generate much heat that will increase the concentration of fumes in the air. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive UN1802, UN2032, UN3084, UN3093, UN1796 (above 50%), UN1826 (above 50%), and UN2031 (above Vapors may accumulate in confined areas (basement, tanks, hopper/tank cars, etc.).
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; full-face SCBA, chemical-resistant suit, gloves and boots required; avoid moisture contact
Water reactivity: Reacts exothermically with water producing heat and corrosive hydrochloric acid fumes; violent reaction with moisture. Recommended extinguishing: Dry chemical, dry sand, soda ash; do not use water or water-based agents.
ERG Guide 157 recommendation: ERG 157: isolate spill 25-50m all directions; large spill consider initial evacuation 100m downwind
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 157 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.