☣️ UN 1493 • CLASS 5
Silver nitrate
Placard: Oxidizer. 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 1493
Class: 5
Placard type: Oxidizer
ERG: Guide 140 (check current ERG)
Isolation: ERG 140: Isolate spill 25-50m all directions. If tank/rail car involved in fire, isolate 800m all directions and consider evacuation for 800m in all directions.
Chemical & Response Details
| Also known as | Lunar causticSilver(I) nitrateNitric acid silver saltAgNO3 |
| CAS Number | 7761-88-8 |
| Appearance | Colorless to white crystalline solid, odorless. Becomes grayish-black upon exposure to light in the presence of organic matter. |
| Flash Point | Not applicable (oxidizing solid) |
| Boiling Point | 444°C (831°F) - decomposes |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Soluble in water; exothermic dissolution may generate heat. No violent reaction but aqueous solutions are corrosive. |
| Extinguishing | Dry chemical, CO2, or water spray acceptable. Avoid organic materials and combustibles near spill area. |
| PPE | ⚠️ Level C minimum for spills; Level B for fire involvement. Chemical-resistant gloves, splash goggles, and protective clothing required. SCBA if heated or fire conditions. |
| Isolation | ERG 140: Isolate spill 25-50m all directions. If tank/rail car involved in fire, isolate 800m all directions and consider evacuation for 800m in all directions. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- These substances will accelerate burning when involved in a fire.
- Some may decompose explosively when heated or involved in a fire.
- May explode from heat or contamination.
- Some will react explosively with hydrocarbons (fuels).
- May ignite combustibles (wood, paper, oil, clothing, etc.).
- Containers may explode when heated.
- Runoff may create fire or explosion hazard.
- Inhalation, ingestion or contact (skin, eyes) with vapors or substance may cause severe injury, burns or
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
- Consider initial downwind evacuation for at least 100 meters (330 feet).
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UN 1493 — Silver nitrate HAZMAT RADIO NOTE — UN 1493
Product: Silver nitrate
Class 5 / Oxidizer / ERG 140
PPE: Level C minimum for spills; Level B for fire involvement. Chemical-resistant gloves, splash goggles, and protective clothing required. SCBA if heated or fire conditions.
ISOLATION: ERG 140: Isolate spill 25-50m all directions. If tank/rail car involved in fire, isolate 800m all directions and consider evacuation for 800m in all directions.
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 1493 — Silver nitrate
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: Colorless to white crystalline solid, odorless. Becomes grayish-black upon exposure to light in the presence of organic matter.
Water Reactivity: Soluble in water; exothermic dissolution may generate heat. No violent reaction but aqueous solutions are corrosive.
Extinguishing: Dry chemical, CO2, or water spray acceptable. Avoid organic materials and combustibles near spill area.
PPE: Level C minimum for spills; Level B for fire involvement. Chemical-resistant gloves, splash goggles, and protective clothing required. SCBA if heated or fire conditions.
Isolation: ERG 140: Isolate spill 25-50m all directions. If tank/rail car involved in fire, isolate 800m all directions and consider evacuation for 800m in all directions.
— Key Hazards —
• These substances will accelerate burning when involved in a fire.
• Some may decompose explosively when heated or involved in a fire.
• May explode from heat or contamination.
— 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/1493 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1493 Silver nitrate Cls5 ERG140 | ERG 140: Isolate spill 25-50m all directions. If tank/rail car involved in fire, | allfirefighter.com/hazmat/un/1493SMS / 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/1493
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FAQ
These substances will accelerate burning when involved in a fire. Some may decompose explosively when heated or involved in a fire. May explode from heat or contamination. Some will react explosively with hydrocarbons (fuels). May ignite combustibles (wood, paper, oil, clothing, etc.). Containers may explode when heated. Runoff may create fire or explosion hazard. Inhalation, ingestion or contact (skin, eyes) with vapors or substance may cause severe injury, burns or
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 C minimum for spills; Level B for fire involvement. Chemical-resistant gloves, splash goggles, and protective clothing required. SCBA if heated or fire conditions.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 140 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.