UN 1453 — Calcium chlorite
Placard: Oxidizer. ERG Guide 140. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 1453 is Calcium chlorite, a Class 5 oxidizer assigned to ERG Guide 140. Chlorate, chlorite or bromate salts can intensify fire and react violently with organic or reducing materials.
Hazard overview: UN 1453 presents oxidizer, contamination and fire acceleration hazards. Heat, fuels, sulfur, phosphorus, organics or reducing agents can create violent reaction or explosion risk.
Response guidance: For a UN 1453 incident, responders should verify the product with shipping papers, package markings, SDS and ERG Guide 140. Establish incident command, isolate the area, stay upwind, prevent incompatible contact and choose extinguishing or spill-control actions based on the ERG, SDS and local SOP.
Firefighter training notes: Training for UN 1453 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, mixing contaminated material and using incompatible cleanup methods. Use ERG 140, SDS and local SOP.
Regulatory context: Calcium chlorite 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: Calcium chlorite 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.
UN 1453 Quick Details
Common Hazards of UN 1453
- OXIDIZER: may intensify fire and accelerate burning of combustible materials.
- May explode from heat, friction or contamination.
- May ignite combustibles such as wood, paper, oil, clothing or packaging.
- Chlorates, chlorites and bromates can react violently with fuels, organics, sulfur, phosphorus or reducing agents.
- Containers may rupture or explode when heated.
- Fire may produce irritating and/or toxic gases.
- Runoff may create fire, explosion or environmental hazards.
- Dust, solution or decomposition products may irritate or injure eyes, skin or respiratory tissue.
Chemical Identity & Physical Properties
White to yellowish powder or granular solid with a slight chlorine-like odor at room temperature.
| Also known as | Calcium chloriteCalcium hypochlorite chloriteChlorous acid calcium salt |
| CAS Number | 14674-72-7 |
| Appearance | White to yellowish powder or granular solid with a slight chlorine-like odor at room temperature. |
| Flash Point | Not applicable (oxidizing solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Reacts with water releasing heat and oxygen; may accelerate combustion of nearby materials |
Fireground Response Guidance — UN 1453
Extinguishing Media
PPE Requirements
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; avoid dust inhalation and contaminated runoff.
Isolation & Evacuation
First Actions for a UN 1453 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 or drains 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.
📋 Copy & Share Field Card
UN 1453 — Calcium chloriteUse for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.