☣️ UN 1794 • CLASS 8
UN 1794 — Lead sulphate, with more than 3% free acid
Placard: Corrosive. ERG Guide 154. 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 1794 Quick Details
UN 1794
Product name: Lead sulphate, with more than 3% free acid
DOT Class: 8
Placard type: Corrosive
ERG Guide: 154 (check current ERG)
Initial isolation: ERG 154: isolate spill area immediate 25m (80ft) in all directions; for large spills isolate 50m (160ft); avoid inhalation of dust and contact with free acid
Common Hazards of UN 1794
- TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
- Contact with molten substance may cause severe burns to skin and eyes.
- Avoid any skin contact.
- Fire may 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
- Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.).
- Corrosives in contact with metals may evolve flammable hydrogen gas.
Chemical Identity & Physical Properties
| Also known as | Lead sulfateSulfuric acid lead saltAnglesiteFast whiteFreemans white leadPlumbous sulfate |
| CAS Number | 7446-14-2 |
| Appearance | White crystalline solid or powder. Odorless. Heavy, dense material that may contain residual sulfuric acid giving it corrosive properties. |
| Flash Point | Not applicable (inorganic salt) |
| Boiling Point | Not applicable (decomposes above 1000C/1832F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Slightly soluble in water; free sulfuric acid content may generate heat upon dilution |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1794
Extinguishing Media
Dry chemical, soda ash, lime; avoid water spray directly on material due to acid content
PPE Requirements
⚠️ Level B minimum; acid-resistant suits, chemical splash goggles, acid-resistant gloves; SCBA required in enclosed spaces or spill situations; lead exposure requires respiratory protection
Isolation & Evacuation
ERG 154: isolate spill area immediate 25m (80ft) in all directions; for large spills isolate 50m (160ft); avoid inhalation of dust and contact with free acid
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 154).
First Actions for a UN 1794 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 1794 — Lead sulphate, with more than 3% free acHAZMAT RADIO NOTE — UN 1794
Product: Lead sulphate, with more than 3% free acid
Class 8 / Corrosive / ERG 154
PPE: Level B minimum; acid-resistant suits, chemical splash goggles, acid-resistant gloves; SCBA required in enclosed spaces or spill situations; lead exposure requires respiratory protection
ISOLATION: ERG 154: isolate spill area immediate 25m (80ft) in all directions; for large spills isolate 50m (160ft); avoid inhalation of dust and contact with free acid
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 1794 — Lead sulphate, with more than 3% free acid
Class: 8 | Placard: Corrosive | ERG Guide: 154
Appearance: White crystalline solid or powder. Odorless. Heavy, dense material that may contain residual sulfuric acid giving it corrosive properties.
Water Reactivity: Slightly soluble in water; free sulfuric acid content may generate heat upon dilution
Extinguishing: Dry chemical, soda ash, lime; avoid water spray directly on material due to acid content
PPE: Level B minimum; acid-resistant suits, chemical splash goggles, acid-resistant gloves; SCBA required in enclosed spaces or spill situations; lead exposure requires respiratory protection
Isolation: ERG 154: isolate spill area immediate 25m (80ft) in all directions; for large spills isolate 50m (160ft); avoid inhalation of dust and contact with free acid
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
• Contact with molten substance may cause severe burns to skin and eyes.
• Avoid any skin contact.
— 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/1794 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1794 Lead sulphate, with more than 3% free acid Cls8 ERG154 | allfirefighter.com/hazmat/un/1794SMS / 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/1794
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Frequently Asked Questions about UN 1794
TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Fire may 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 Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Corrosives in contact with metals may evolve flammable hydrogen gas.
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; acid-resistant suits, chemical splash goggles, acid-resistant gloves; SCBA required in enclosed spaces or spill situations; lead exposure requires respiratory protection
Water reactivity: Slightly soluble in water; free sulfuric acid content may generate heat upon dilution. Recommended extinguishing: Dry chemical, soda ash, lime; avoid water spray directly on material due to acid content.
ERG Guide 154 recommendation: ERG 154: isolate spill area immediate 25m (80ft) in all directions; for large spills isolate 50m (160ft); avoid inhalation of dust and contact with free acid
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 154 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.