☣️ UN 3284 • CLASS 6
Tellurium compound, n.o.s.
Placard: Toxic. 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 3284
Class: 6
Placard type: Toxic
ERG: Guide 151 (check current ERG)
Isolation: ERG 151: Initial isolation 50m in all directions; Protective Action Distance: Daytime 100m, Nighttime 300m for small spills; increase distances for large spills or fire involvement
Chemical & Response Details
| Also known as | Tellurium compoundsOrganotellurium compoundsTellurium derivativesTellurium-containing substances |
| Appearance | Variable appearance depending on specific compound; may be solid powder, crystalline material, or liquid. Many tellurium compounds are dark colored (gray, black, brown) with characteristic garlic-like odor. |
| Flash Point | Varies by specific compound; many are non-flammable solids |
| Boiling Point | Varies widely by specific compound |
| Vapor Density | Varies by specific compound; many are solid materials |
| Water Reactivity | Generally low reactivity with water; some organotellurium compounds may hydrolyze slowly |
| Extinguishing | Dry chemical, CO2, water spray for cooling; foam may be used on fires involving liquid forms |
| PPE | ⚠️ Level B minimum required; SCBA mandatory; full chemical-resistant suit; avoid all skin contact due to high toxicity and absorption risk |
| Isolation | ERG 151: Initial isolation 50m in all directions; Protective Action Distance: Daytime 100m, Nighttime 300m for small spills; increase distances for large spills or fire involvement |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
- 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
- Containers may explode when heated.
- Runoff may pollute waterways.
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.
- 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 3284 — Tellurium compound, n.o.s. HAZMAT RADIO NOTE — UN 3284
Product: Tellurium compound, n.o.s.
Class 6 / Toxic / ERG 151
PPE: Level B minimum required; SCBA mandatory; full chemical-resistant suit; avoid all skin contact due to high toxicity and absorption risk
ISOLATION: ERG 151: Initial isolation 50m in all directions; Protective Action Distance: Daytime 100m, Nighttime 300m for small spills; increase distances for large spills or fire involvement
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 3284 — Tellurium compound, n.o.s.
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Variable appearance depending on specific compound; may be solid powder, crystalline material, or liquid. Many tellurium compounds are dark colored (gray, black, brown) with characteristic garlic-like odor.
Water Reactivity: Generally low reactivity with water; some organotellurium compounds may hydrolyze slowly
Extinguishing: Dry chemical, CO2, water spray for cooling; foam may be used on fires involving liquid forms
PPE: Level B minimum required; SCBA mandatory; full chemical-resistant suit; avoid all skin contact due to high toxicity and absorption risk
Isolation: ERG 151: Initial isolation 50m in all directions; Protective Action Distance: Daytime 100m, Nighttime 300m for small spills; increase distances for large spills or fire involvement
— Key Hazards —
• Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
• Avoid any skin contact.
• Fire may produce irritating, corrosive and/or toxic gases.
— 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.
• 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/3284 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3284 Tellurium compound, n.o.s. Cls6 ERG151 | allfirefighter.com/hazmat/un/3284SMS / 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/3284
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FAQ
Highly toxic, may be fatal if inhaled, ingested or absorbed through skin. 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 Containers may explode when heated. Runoff may pollute waterways.
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 required; SCBA mandatory; full chemical-resistant suit; avoid all skin contact due to high toxicity and absorption risk
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 151 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.