☣️ UN 2506 • CLASS 8
Ammonium hydrogen sulphate
Placard: Corrosive. 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 2506
Class: 8
Placard type: Corrosive
ERG: Guide 154 (check current ERG)
Isolation: ERG 154: isolate spill 25m all directions initially. In fire, isolate 800m all directions and consider evacuation.
Chemical & Response Details
| Also known as | Ammonium bisulfateAmmonium hydrogen sulfateMonoammonium sulfateSulfuric acid monoammonium salt |
| CAS Number | 7803-63-6 |
| Appearance | White to gray crystalline solid or powder. Odorless or slight ammonia odor. Hygroscopic and may form lumps when exposed to moisture. |
| Flash Point | Not applicable (non-flammable solid) |
| Boiling Point | Decomposes at approximately 147C (297F) releasing ammonia and sulfur dioxide |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Dissolves in water to form acidic solution. No violent reaction but solution is corrosive. |
| Extinguishing | Water spray, dry chemical, CO2. Avoid direct water streams on large quantities due to heat generation. |
| PPE | ⚠️ Level B minimum for spills; full face protection, acid-resistant gloves and clothing. SCBA if dust or decomposition fumes present. |
| Isolation | ERG 154: isolate spill 25m all directions initially. In fire, isolate 800m all directions and consider evacuation. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
- Contact with molten substance may cause severe burns to skin and eyes.
- Avoid any skin contact.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental
- Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive
- Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.).
- Corrosives in contact with metals may evolve flammable hydrogen gas.
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
- 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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UN 2506 — Ammonium hydrogen sulphate HAZMAT RADIO NOTE — UN 2506
Product: Ammonium hydrogen sulphate
Class 8 / Corrosive / ERG 154
PPE: Level B minimum for spills; full face protection, acid-resistant gloves and clothing. SCBA if dust or decomposition fumes present.
ISOLATION: ERG 154: isolate spill 25m all directions initially. In fire, isolate 800m all directions and consider evacuation.
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 2506 — Ammonium hydrogen sulphate
Class: 8 | Placard: Corrosive | ERG Guide: 154
Appearance: White to gray crystalline solid or powder. Odorless or slight ammonia odor. Hygroscopic and may form lumps when exposed to moisture.
Water Reactivity: Dissolves in water to form acidic solution. No violent reaction but solution is corrosive.
Extinguishing: Water spray, dry chemical, CO2. Avoid direct water streams on large quantities due to heat generation.
PPE: Level B minimum for spills; full face protection, acid-resistant gloves and clothing. SCBA if dust or decomposition fumes present.
Isolation: ERG 154: isolate spill 25m all directions initially. In fire, isolate 800m all directions and consider evacuation.
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
• Contact with molten substance may cause severe burns to skin and eyes.
• Avoid any skin contact.
— 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/2506 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2506 Ammonium hydrogen sulphate Cls8 ERG154 | allfirefighter.com/hazmat/un/2506SMS / 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/2506
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FAQ
TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Corrosives in contact with metals may evolve flammable hydrogen gas.
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 face protection, acid-resistant gloves and clothing. SCBA if dust or decomposition fumes present.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 154 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.