UN 3510 — Adsorbed gas, flammable, n.o.s.
Placard: Flammable Gas. ERG Guide 174. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 3510 is Adsorbed gas, flammable, n.o.s., a pressurized hazardous material assigned to ERG Guide 174. The exact contents should be verified from shipping papers and the SDS before close-range action.
Hazard overview: Primary hazards include fire or vapor ignition, container rupture. Adsorbed gas, flammable, n.o.s. may release irritating, toxic or corrosive vapors when heated, spilled or involved in fire, so avoid contact, inhalation and incompatible materials.
Response guidance: For a UN 3510 incident, establish incident command, isolate the area, stay upwind and uphill, keep unauthorized personnel away, verify shipping papers/SDS and follow ERG 174. Use extinguishing, cooling, containment and decontamination tactics only when compatible with the material and local SOP.
UN 3510 Quick Details
Common Hazards of UN 3510
- Some gases will be ignited by heat, sparks or flames.
- Substance does not burn but will support combustion.
- Vapors may travel to source of ignition and flash back.
- Cylinders exposed to fire may vent and release flammable gas through pressure relief devices.
- Containers may explode when exposed to prolonged direct flame impingement.
- Vapors may cause dizziness or asphyxiation without warning, especially when in closed or confined areas.
- Some may be irritating if inhaled at high concentrations.
- Contact with gas may cause burns and injury.
Chemical Identity & Physical Properties
Compressed gas adsorbed onto a porous solid material in a pressure vessel. The specific gas is not specified (n.o.s. - not otherwise specified) and may vary. Typically colorless to pale colored depending on the specific flammable gas adsorbed.
| Also known as | Adsorbed flammable gasFlammable gas adsorbed n.o.s.UN3510 adsorbed gas |
| Appearance | Compressed gas adsorbed onto a porous solid material in a pressure vessel. The specific gas is not specified (n.o.s. - not otherwise specified) and may vary. Typically colorless to pale colored depending on the specific flammable gas adsorbed. |
| Flash Point | Not applicable (compressed gas) |
| Boiling Point | Not applicable (varies by specific gas) |
| Vapor Density | Varies by specific gas; typically heavier than air for most flammable gases |
| Water Reactivity | No significant reaction for most flammable gases; specific reactivity depends on the gas adsorbed |
Fireground Response Guidance — UN 3510
Extinguishing Media
PPE Requirements
Level B minimum with SCBA required; full-face respirator with appropriate gas cartridge; chemical-resistant gloves and protective clothing
Isolation & Evacuation
First Actions for a UN 3510 Incident
- 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 for at least 100 meters (330 feet) in all directions.
- Consider initial downwind evacuation for at least 800 meters (1/2 mile).
📋 Copy & Share Field Card
UN 3510 — Adsorbed gas, flammable, n.o.s.Use 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.