☣️ UN 2984 • CLASS 5

Hydrogen peroxide, aqueous solution, with not less than 8% but less than 20% hydrogen peroxide

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 2984
Class: 5
Placard type: Oxidizer
ERG: Guide 140 (check current ERG)
Isolation: ERG 140: isolate spill 25-50m; if tank/rail car involved in fire, isolate 800m all directions
Chemical & Response Details
Also known ashydrogen dioxideperoxidehydrogen peroxide solutionperhydrol dilute
CAS Number7722-84-1
AppearanceClear, colorless liquid with a slightly sharp odor. Aqueous solution is stable at concentrations below 20% at room temperature.
Flash PointNot applicable (non-flammable oxidizer)
Boiling Point108C (226F) for 35% solution; varies with concentration
Vapor Density1.4 (heavier than air)
Water ReactivityMiscible with water; dilution generates heat but no violent reaction at these concentrations
ExtinguishingWater spray, dry chemical, CO2; avoid incompatible materials like metals and organics
PPE⚠️ Level C minimum with chemical-resistant suit, gloves, and face shield; SCBA for concentrations or confined spaces
IsolationERG 140: isolate spill 25-50m; if tank/rail car involved in fire, isolate 800m 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 2984 — Hydrogen peroxide, aqueous solution, wit
HAZMAT RADIO NOTE — UN 2984 Product: Hydrogen peroxide, aqueous solution, with not less than 8% but less than 20% hydrogen peroxide Class 5 / Oxidizer / ERG 140 PPE: Level C minimum with chemical-resistant suit, gloves, and face shield; SCBA for concentrations or confined spaces ISOLATION: ERG 140: isolate spill 25-50m; if tank/rail car involved in fire, isolate 800m all directions 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 2984 — Hydrogen peroxide, aqueous solution, with not less than 8% but less than 20% hydrogen peroxide Class: 5 | Placard: Oxidizer | ERG Guide: 140 Appearance: Clear, colorless liquid with a slightly sharp odor. Aqueous solution is stable at concentrations below 20% at room temperature. Water Reactivity: Miscible with water; dilution generates heat but no violent reaction at these concentrations Extinguishing: Water spray, dry chemical, CO2; avoid incompatible materials like metals and organics PPE: Level C minimum with chemical-resistant suit, gloves, and face shield; SCBA for concentrations or confined spaces Isolation: ERG 140: isolate spill 25-50m; if tank/rail car involved in fire, isolate 800m 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/2984 | Always use current ERG + SOP/SOGIC BRIEFING

Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.

SMS (short)
UN2984 Hydrogen peroxide, aqueous solution, with not less than 8% but less than 20% hydrogen peroxide Cls5 ERG140 | allfirefighter.com/hazmat/un/2984SMS / 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/2984
Related UN numbers (same class)
Discovery block for training / quick reference. Always consult the current ERG + your SOP/SOG for operations.
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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 with chemical-resistant suit, gloves, and face shield; SCBA for concentrations or confined spaces

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.