☣️ UN 1384 • CLASS 4
UN 1384 — Sodium hydrosulphite
Placard: Spontaneously Combustible. ERG Guide 135. 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 1384 Quick Details
UN 1384
Product name: Sodium hydrosulphite
DOT Class: 4
Placard type: Spontaneously Combustible
ERG Guide: 135 (check current ERG)
Initial isolation: ERG 135: Initial isolation 100m in all directions. If tank/rail car involved in fire, isolate 800m in all directions and consider initial evacuation 800m in all directions.
Common Hazards of UN 1384
- Flammable/combustible material.
- May ignite on contact with moist air or moisture.
- May burn rapidly with flare-burning effect.
- Some react vigorously or explosively on contact with water.
- Some may decompose explosively when heated or involved in a fire.
- May re-ignite after fire is extinguished.
- Runoff may create fire or explosion hazard.
- Containers may explode when heated.
Chemical Identity & Physical Properties
| Also known as | Sodium dithioniteSodium hydrosulfiteSodium sulfoxylateVatroliteHydros |
| CAS Number | 7775-14-6 |
| Appearance | White to grayish-white crystalline powder or granular solid. Odorless or slight sulfurous odor. Hygroscopic material that may become damp or caked on exposure to moist air. |
| Flash Point | Not applicable (spontaneously combustible solid) |
| Boiling Point | Not applicable (decomposes at approximately 52C/126F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Reacts with water generating heat and sulfur dioxide gas. May ignite spontaneously when wet or exposed to moisture. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1384
Extinguishing Media
Dry chemical, sand, dry lime, soda ash. DO NOT use water or foam on bulk material.
PPE Requirements
⚠️ Level B minimum recommended. SCBA required for fire or spill scenarios. Chemical-resistant suit for handling material. Avoid moisture contact.
Isolation & Evacuation
ERG 135: Initial isolation 100m in all directions. If tank/rail car involved in fire, isolate 800m in all directions and consider initial evacuation 800m in all directions.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 135).
First Actions for a UN 1384 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Stay upwind, uphill and/or upstream.
- Keep unauthorized personnel away.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials: increase the immediate precautionary measure distance, in the downwind
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📋 Copy & Share Field Card
UN 1384 — Sodium hydrosulphiteHAZMAT RADIO NOTE — UN 1384
Product: Sodium hydrosulphite
Class 4 / Spontaneously Combustible / ERG 135
PPE: Level B minimum recommended. SCBA required for fire or spill scenarios. Chemical-resistant suit for handling material. Avoid moisture contact.
ISOLATION: ERG 135: Initial isolation 100m in all directions. If tank/rail car involved in fire, isolate 800m in all directions and consider initial evacuation 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 1384 — Sodium hydrosulphite
Class: 4 | Placard: Spontaneously Combustible | ERG Guide: 135
Appearance: White to grayish-white crystalline powder or granular solid. Odorless or slight sulfurous odor. Hygroscopic material that may become damp or caked on exposure to moist air.
Water Reactivity: Reacts with water generating heat and sulfur dioxide gas. May ignite spontaneously when wet or exposed to moisture.
Extinguishing: Dry chemical, sand, dry lime, soda ash. DO NOT use water or foam on bulk material.
PPE: Level B minimum recommended. SCBA required for fire or spill scenarios. Chemical-resistant suit for handling material. Avoid moisture contact.
Isolation: ERG 135: Initial isolation 100m in all directions. If tank/rail car involved in fire, isolate 800m in all directions and consider initial evacuation 800m in all directions.
— Key Hazards —
• Flammable/combustible material.
• May ignite on contact with moist air or moisture.
• May burn rapidly with flare-burning effect.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Stay upwind, uphill and/or upstream.
• Keep unauthorized personnel away.
• Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
SOURCE: allfirefighter.com/hazmat/un/1384 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1384 Sodium hydrosulphite Cls4 ERG135 | ERG 135: Initial isolation 100m in all directions. If tank/rail car involved in | allfirefighter.com/hazmat/un/1384SMS / 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/1384
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Frequently Asked Questions about UN 1384
Flammable/combustible material. May ignite on contact with moist air or moisture. May burn rapidly with flare-burning effect. Some react vigorously or explosively on contact with water. Some may decompose explosively when heated or involved in a fire. May re-ignite after fire is extinguished. Runoff may create fire or explosion hazard. Containers may explode when heated.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Stay upwind, uphill and/or upstream. Keep unauthorized personnel away.
Level B minimum recommended. SCBA required for fire or spill scenarios. Chemical-resistant suit for handling material. Avoid moisture contact.
Water reactivity: Reacts with water generating heat and sulfur dioxide gas. May ignite spontaneously when wet or exposed to moisture.. Recommended extinguishing: Dry chemical, sand, dry lime, soda ash. DO NOT use water or foam on bulk material..
ERG Guide 135 recommendation: ERG 135: Initial isolation 100m in all directions. If tank/rail car involved in fire, isolate 800m in all directions and consider initial evacuation 800m in all directions.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 135 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.