☣️ UN 1458 • CLASS 5
UN 1458 — Chlorate and borate mixture
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.
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UN 1458 Quick Details
UN 1458
Product name: Chlorate and borate mixture
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: isolate spill area 25m in all directions; if tank/cargo involved in fire, isolate 800m and consider evacuation 1600m downwind
Common Hazards of UN 1458
- 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
Chemical Identity & Physical Properties
| Also known as | Chlorate-borate mixtureBorate and chlorate mixtureMixed oxidizing salt formulation |
| Appearance | White to off-white crystalline solid or powder mixture. Odorless. Stable at room temperature but becomes reactive when heated or contaminated. |
| Flash Point | Not applicable (oxidizing solid mixture) |
| Boiling Point | Not applicable (decomposes at elevated temperatures) |
| Vapor Density | Not applicable (solid mixture) |
| Water Reactivity | Soluble in water; aqueous solutions may be reactive with organic materials and reducing agents |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1458
Extinguishing Media
Water spray or fog only; avoid foam, dry chemicals may react with oxidizers
PPE Requirements
⚠️ Level B minimum for spills; full structural firefighters' protective clothing with SCBA for fire situations
Isolation & Evacuation
ERG 140: isolate spill area 25m in all directions; if tank/cargo involved in fire, isolate 800m and consider evacuation 1600m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 1458 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
- Consider initial downwind evacuation for at least 100 meters (330 feet).
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📋 Copy & Share Field Card
UN 1458 — Chlorate and borate mixtureHAZMAT RADIO NOTE — UN 1458
Product: Chlorate and borate mixture
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum for spills; full structural firefighters' protective clothing with SCBA for fire situations
ISOLATION: ERG 140: isolate spill area 25m in all directions; if tank/cargo involved in fire, isolate 800m and consider evacuation 1600m downwind
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 1458 — Chlorate and borate mixture
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: White to off-white crystalline solid or powder mixture. Odorless. Stable at room temperature but becomes reactive when heated or contaminated.
Water Reactivity: Soluble in water; aqueous solutions may be reactive with organic materials and reducing agents
Extinguishing: Water spray or fog only; avoid foam, dry chemicals may react with oxidizers
PPE: Level B minimum for spills; full structural firefighters' protective clothing with SCBA for fire situations
Isolation: ERG 140: isolate spill area 25m in all directions; if tank/cargo involved in fire, isolate 800m and consider evacuation 1600m downwind
— 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/1458 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1458 Chlorate and borate mixture Cls5 ERG140 | allfirefighter.com/hazmat/un/1458SMS / 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/1458
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Frequently Asked Questions about UN 1458
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 B minimum for spills; full structural firefighters' protective clothing with SCBA for fire situations
Water reactivity: Soluble in water; aqueous solutions may be reactive with organic materials and reducing agents. Recommended extinguishing: Water spray or fog only; avoid foam, dry chemicals may react with oxidizers.
ERG Guide 140 recommendation: ERG 140: isolate spill area 25m in all directions; if tank/cargo involved in fire, isolate 800m and consider evacuation 1600m downwind
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.