☣️ UN 1488 • CLASS 5

UN 1488 — Potassium nitrite

Placard: Oxidizer. ERG Guide 140. 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.

UN 1488 is Potassium nitrite, a Class 5 nitrate/nitrite oxidizer assigned to ERG Guide 140. It can intensify fire and may decompose when heated or contaminated.

Hazard overview: UN 1488 presents oxidizer, heating and contamination hazards. Keep away from fuels, organics and reducing agents, and control dust or runoff according to SDS and incident command.

Response guidance: For a UN 1488 incident, responders should verify the product with shipping papers, package markings, SDS and ERG Guide 140. Establish incident command, isolate the area, stay upwind, keep fuels and organics away, avoid contaminated absorbents and choose extinguishing or spill-control actions based on ERG, SDS and local SOP.

Firefighter training notes: Training for UN 1488 should emphasize oxidizer fire behavior, separation from fuels and organics, contamination control, dust avoidance, container-heating hazards and correct extinguishing decisions. Common errors include treating oxidizers like ordinary combustibles and using contaminated absorbents. Use ERG 140, SDS and local SOP.

Regulatory context: Potassium nitrite is regulated as a hazardous material for transportation and emergency response purposes. Transportation, workplace exposure, spill reporting, waste handling, storage and environmental requirements may vary by formulation, quantity and jurisdiction. Verify current requirements through shipping papers, SDS, facility documents and applicable DOT, OSHA, EPA, NFPA, state or local authority guidance.

Storage & handling: Potassium nitrite should be stored in compatible oxidizer storage away from fuels, organic materials, reducing agents, acids where incompatible, heat, ignition sources and contamination. Keep containers closed, dry, clearly labeled and separated from combustible packaging or spilled residues.

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UN 1488 Quick Details

UN 1488
Product name: Potassium nitrite
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: isolate spill 25-50m; if fire or large spill, isolate 800m all directions and evacuate downwind

Common Hazards of UN 1488

  • OXIDIZER: may intensify fire and accelerate burning of combustible materials.
  • Heating or confinement may cause decomposition and pressure buildup.
  • May ignite combustibles such as wood, paper, oil, clothing, packaging or contaminated absorbents.
  • Nitrates and nitrites may react dangerously with fuels, organic materials, reducing agents or contamination.
  • Containers may rupture or explode when heated.
  • Fire may produce irritating and/or toxic gases.
  • Runoff may spread oxidizing material and create fire, explosion or environmental hazards.
  • Dust, solution or decomposition products may irritate or injure eyes, skin or respiratory tissue.
  • Heating or acid contamination may produce toxic nitrogen oxides.

Chemical Identity & Physical Properties

White to slightly yellowish crystalline powder or granular solid. Odorless. Hygroscopic and may cake when exposed to moisture.

Also known asNitrous acid potassium saltPotassium nitrite (KNO2)Saltpeter (potassium nitrite)
CAS Number7758-09-0
AppearanceWhite to slightly yellowish crystalline powder or granular solid. Odorless. Hygroscopic and may cake when exposed to moisture.
Flash PointNot applicable (oxidizing solid)
Boiling PointNot applicable (decomposes above 440C/824F)
Vapor DensityNot applicable (solid)
Water ReactivitySoluble in water forming alkaline solution; no violent reaction but may release toxic nitrogen oxides if contaminated or heated
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.

Fireground Response Guidance — UN 1488

Extinguishing Media

Use water spray or flooding water from a protected position when appropriate for oxidizer fires; dry chemical or CO2 may not control fires involving large oxidizer quantities. Keep combustibles and fuels away.

PPE Requirements

⚠️ Level B minimum; SCBA required in fire or decomposition; chemical-resistant suit and gloves for spills

Use positive-pressure SCBA for fire, dust, decomposition or confined-space exposure. Chemical-resistant gloves, eye/face protection and protective clothing should be selected from SDS and incident command.

Isolation & Evacuation

ERG 140: isolate spill 25-50m; if fire or large spill, isolate 800m all directions and evacuate downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).

First Actions for a UN 1488 Incident

  • CALL 911. Then call the emergency response telephone number on the shipping paper, if available.
  • Keep unauthorized personnel away.
  • Stay upwind, uphill and/or upstream.
  • Keep combustibles, fuels, organics, reducing agents and contaminated materials away from the spill.
  • Do not touch or walk through spilled material unless properly trained and wearing appropriate protective equipment.
  • Avoid creating dust clouds and prevent runoff from contacting combustibles, drains or incompatible materials when possible.
  • Ventilate closed spaces before entering, but only if properly trained, equipped and authorized by incident command.
  • Isolate the spill or fire area and expand the perimeter if large quantities, contamination, heating or container involvement are present.
  • Use ERG Guide 140, shipping papers, SDS and local SOP for protective actions and entry decisions.
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📋 Copy & Share Field Card

UN 1488 — Potassium nitrite
HAZMAT RADIO NOTE — UN 1488 Product: Potassium nitrite Class 5 / Oxidizer / ERG 140 PPE: Level B minimum; SCBA required in fire or decomposition; chemical-resistant suit and gloves for spills ISOLATION: ERG 140: isolate spill 25-50m; if fire or large spill, isolate 800m all directions and evacuate downwind ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO

Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.

SMS WhatsApp
=== IC HAZMAT BRIEFING === UN 1488 — Potassium nitrite Class: 5 | Placard: Oxidizer | ERG Guide: 140 Appearance: White to slightly yellowish crystalline powder or granular solid. Odorless. Hygroscopic and may cake when exposed to moisture. Water Reactivity: Soluble in water forming alkaline solution; no violent reaction but may release toxic nitrogen oxides if contaminated or heated Extinguishing: Use water spray or flooding water from a protected position when appropriate for oxidizer fires; dry chemical or CO2 may not control fires involving large oxidizer quantities. Keep combustibles and fuels away. PPE: Level B minimum; SCBA required in fire or decomposition; chemical-resistant suit and gloves for spills Isolation: ERG 140: isolate spill 25-50m; if fire or large spill, isolate 800m all directions and evacuate downwind — Key Hazards — • OXIDIZER: may intensify fire and accelerate burning of combustible materials. • Heating or confinement may cause decomposition and pressure buildup. • May ignite combustibles such as wood, paper, oil, clothing, packaging or contaminated absorbents. — First Actions — • CALL 911. Then call the emergency response telephone number on the shipping paper, if available. • Keep unauthorized personnel away. • Stay upwind, uphill and/or upstream. • Keep combustibles, fuels, organics, reducing agents and contaminated materials away from the spill. SOURCE: allfirefighter.com/hazmat/un/potassium-nitrite-un-1488 | Always use current ERG + SOP/SOGIC BRIEFING

Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.

SMS (short)
UN1488 Potassium nitrite Cls5 ERG140 | allfirefighter.com/hazmat/un/potassium-nitrite-un-1488SMS / 160 CHAR

Use for: Quick text to command or incoming units. Fits in a single SMS.

⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions. Page: https://allfirefighter.com/hazmat/un/potassium-nitrite-un-1488

Related UN Numbers in Class 5

Discovery block for training / quick reference. Always consult the current ERG + your SOP/SOG for operations.
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Frequently Asked Questions about UN 1488

UN 1488 is Potassium nitrite, a Class 5 oxidizer assigned to ERG Guide 140.

No. It is not normally flammable, but it can strongly accelerate burning of other materials.

ERG Guide 140 applies to UN 1488 for initial isolation, protective actions and first response guidance.

UN 1488 presents oxidizer, heating and contamination hazards. Keep away from fuels, organics and reducing agents, and control dust or runoff according to SDS and incident command.

Use positive-pressure SCBA for fire, dust, decomposition or confined-space exposure. Chemical-resistant gloves, eye/face protection and protective clothing should be selected from SDS and incident command.

Water may be useful from a protected position for cooling or flooding some oxidizer fires, but final choice should follow ERG, SDS and incident command because contamination and runoff can worsen hazards.
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.