☣️ UN 1499 • CLASS 5
Sodium nitrate and potassium nitrate mixture
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 1499
Class: 5
Placard type: Oxidizer
ERG: Guide 140 (check current ERG)
Isolation: ERG 140: Isolate spill area immediate vicinity. For large spills consider initial downwind evacuation 100m. If fire involved, increase isolation 800m in all directions.
Chemical & Response Details
| Also known as | sodium nitrate-potassium nitrate mixturenitrate salt mixtureNaNO3-KNO3 blendmixed alkali nitrates |
| Appearance | White to off-white crystalline solid or granular powder. Odorless. Hygroscopic, may cake when exposed to moisture. |
| Flash Point | Not applicable (oxidizing solid, non-flammable) |
| Boiling Point | Not applicable (decomposes upon heating above 400C/752F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Dissolves readily in water; no violent reaction. Solution may be corrosive. |
| Extinguishing | Dry chemical, sand, or dry earth. Do not use water streams directly on material. Flood with water to dissolve if necessary. |
| PPE | ⚠️ Level C minimum for spills. SCBA and full protective clothing if fire involved or decomposition occurring. |
| Isolation | ERG 140: Isolate spill area immediate vicinity. For large spills consider initial downwind evacuation 100m. If fire involved, increase isolation 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 1499 — Sodium nitrate and potassium nitrate mix HAZMAT RADIO NOTE — UN 1499
Product: Sodium nitrate and potassium nitrate mixture
Class 5 / Oxidizer / ERG 140
PPE: Level C minimum for spills. SCBA and full protective clothing if fire involved or decomposition occurring.
ISOLATION: ERG 140: Isolate spill area immediate vicinity. For large spills consider initial downwind evacuation 100m. If fire involved, increase isolation 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 1499 — Sodium nitrate and potassium nitrate mixture
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: White to off-white crystalline solid or granular powder. Odorless. Hygroscopic, may cake when exposed to moisture.
Water Reactivity: Dissolves readily in water; no violent reaction. Solution may be corrosive.
Extinguishing: Dry chemical, sand, or dry earth. Do not use water streams directly on material. Flood with water to dissolve if necessary.
PPE: Level C minimum for spills. SCBA and full protective clothing if fire involved or decomposition occurring.
Isolation: ERG 140: Isolate spill area immediate vicinity. For large spills consider initial downwind evacuation 100m. If fire involved, increase isolation 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/1499 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1499 Sodium nitrate and potassium nitrate mixture Cls5 ERG140 | allfirefighter.com/hazmat/un/1499SMS / 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/1499
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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. SCBA and full protective clothing if fire involved or decomposition occurring.
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.