☣️ UN 1228 • CLASS 3
Mercaptan mixture, liquid, flammable, poisonous, n.o.s.
Placard: Flammable. 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 1228
Class: 3
Placard type: Flammable
ERG: Guide 131 (check current ERG)
Verify shipping papers and exact product details; use ERG Guide 131 for initial actions and isolation/evacuation guidance.
Chemical & Response Details
| Also known as | Thiol mixtureSulfhydryl compound mixtureAlkyl mercaptan blendFlammable mercaptan solution |
| Appearance | Clear to pale yellow liquid with extremely strong, offensive, garlic-like or skunk-like odor. Mercaptans are sulfur-containing organic compounds detectable at very low concentrations. |
| Flash Point | Typically below 23°C (73°F), varies by specific mercaptan composition |
| Boiling Point | Variable, typically 35-150°C (95-302°F) depending on mercaptan components |
| Vapor Density | Heavier than air (typically 2-4), vapors accumulate in low areas |
| Water Reactivity | No significant reaction with water, but immiscible and will float on water surface |
| Extinguishing | Alcohol-resistant foam (AR-AFFF), CO2, dry chemical; regular foam may not be effective |
| PPE | ⚠️ Level A or B required; SCBA mandatory; full chemical-resistant suit due to extreme toxicity and skin absorption hazard; butyl rubber gloves recommended |
| Isolation | ERG 131: isolate spill 50m all directions; evacuate 300m downwind for large spills; isolate 800m all directions if tank/rail car involved in fire |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- TOXIC; may be fatal if inhaled, ingested or absorbed through skin.
- Inhalation or contact with some of these materials will irritate or burn skin and eyes.
- Methyl chloroacetate (UN2295) is an eye irritant/lachrymator (causes flow of tears).
- Fire will produce irritating, corrosive and/or toxic gases.
- Vapors may cause dizziness or asphyxiation, especially when in closed or confined areas.
- Runoff from fire control or dilution water may cause environmental contamination.
- HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
- Vapors may form explosive mixtures with air.
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 for at least 50 meters (150 feet) in all directions.
- 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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MAYDAY / HAZMAT QUICK NOTE UN 1228 — Mercaptan mixture, liquid, flammable, poisonous, n.o.s. Class: 3 | Placard: Flammable ERG: Guide 131 (check current ERG) FIRST ACTIONS: use SOP/SOG + ERG; stage upwind; isolate; deny entry; request Hazmat.
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FAQ
TOXIC; may be fatal if inhaled, ingested or absorbed through skin. Inhalation or contact with some of these materials will irritate or burn skin and eyes. Methyl chloroacetate (UN2295) is an eye irritant/lachrymator (causes flow of tears). Fire will produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or asphyxiation, especially when in closed or confined areas. Runoff from fire control or dilution water may cause environmental contamination. HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air.
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 A or B required; SCBA mandatory; full chemical-resistant suit due to extreme toxicity and skin absorption hazard; butyl rubber gloves recommended
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 131 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.