☣️ UN 3437 • CLASS 6
Chlorocresols, solid
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 3437
Class: 6
Placard type: Toxic
ERG: Guide 152 (check current ERG)
Isolation: ERG 152: isolate spill/leak area at least 25m in all directions; large spill: consider initial downwind evacuation 100m
Chemical & Response Details
| Also known as | Chlorinated cresolsChloromethylphenolsPCMC (para-chloro-meta-cresol)Chloro-m-cresolChloro-p-cresol |
| Appearance | White to pale yellow crystalline solid with a characteristic phenolic odor. May appear as powder or crystals at room temperature. |
| Flash Point | 110C (230F) typical for chlorocresol isomers |
| Boiling Point | 235C (455F) typical, may decompose on heating |
| Vapor Density | Not applicable (solid at room temperature) |
| Water Reactivity | No significant reaction with water, slightly soluble |
| Extinguishing | Dry chemical, CO2, water spray, alcohol-resistant foam |
| PPE | ⚠️ Level B minimum; full face respirator with organic vapor cartridge or SCBA; chemical-resistant suit, gloves, and boots required due to severe skin absorption hazard |
| Isolation | ERG 152: isolate spill/leak area at least 25m in all directions; large spill: consider initial downwind evacuation 100m |
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.
- 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
- Combustible material: may burn but does not ignite readily.
- Containers may explode when heated.
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
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 3437 — Chlorocresols, solid HAZMAT RADIO NOTE — UN 3437
Product: Chlorocresols, solid
Class 6 / Toxic / ERG 152
PPE: Level B minimum; full face respirator with organic vapor cartridge or SCBA; chemical-resistant suit, gloves, and boots required due to severe skin absorption hazard
ISOLATION: ERG 152: isolate spill/leak area at least 25m in all directions; large spill: consider initial downwind evacuation 100m
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 3437 — Chlorocresols, solid
Class: 6 | Placard: Toxic | ERG Guide: 152
Appearance: White to pale yellow crystalline solid with a characteristic phenolic odor. May appear as powder or crystals at room temperature.
Water Reactivity: No significant reaction with water, slightly soluble
Extinguishing: Dry chemical, CO2, water spray, alcohol-resistant foam
PPE: Level B minimum; full face respirator with organic vapor cartridge or SCBA; chemical-resistant suit, gloves, and boots required due to severe skin absorption hazard
Isolation: ERG 152: isolate spill/leak area at least 25m in all directions; large spill: consider initial downwind evacuation 100m
— Key Hazards —
• Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
• 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.
• 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/3437 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3437 Chlorocresols, solid Cls6 ERG152 | ERG 152: isolate spill/leak area at least 25m in all directions; large spill: co | allfirefighter.com/hazmat/un/3437SMS / 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/3437
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FAQ
Highly toxic, may be fatal if inhaled, ingested or absorbed through skin. 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 Combustible material: may burn but does not ignite readily. Containers may explode when heated. Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
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; full face respirator with organic vapor cartridge or SCBA; chemical-resistant suit, gloves, and boots required due to severe skin absorption hazard
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 152 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.