Agent Name

Ethanethiol

Alternative Name

Ethyl mercaptan

CAS Number

75-08-1

Formula

C2-H6-S

Major Category

Other Classes

Synonyms

1-Mercaptoethane; Ethanethiol; Ethyl hydrosulfide; Ethyl sulfhydrate; Ethyl thioalcohol; LPG ethyl mercaptan 1010; Mercaptoethane; Thioethanol; Thioethyl alcohol; Ethyl mercaptan; [ChemIDplus] UN2363

Category

Thiols

Description

Colorless liquid with a strong, skunk-like odor; Note: A gas above 95 degrees F; [NIOSH]

Sources/Uses

Used as an odorant for natural gas; used as an intermediate in the plastic, pesticide, and organic chemical industries; [ACGIH]

Comments

Its toxicity in rats and mice is similar to that of butyl mercaptan. Acutely, it is about 1/5 as toxic as hydrogen sulfide. Human volunteers exposed to 1mg/m3 (0.5 ppm) experienced no symptoms, while those exposed to 10 mg/m3 (4 ppm) complained of mucous membrane irritation and fatigue. [ACGIH] Liver necrosis occurs in animals receiving sublethal doses. [HSDB] See "THIOLS."

Exposure Assessment
Skin Designation (ACGIH)

Insufficient data

TLV (ACGIH)

0.5 ppm

PEL (OSHA)

Ceiling(OSHA) = 10 ppm

MAK

0.5 ppm

IDLH (NIOSH)

500 ppm

Excerpts from Documentation for IDLHs

Basis for original (SCP) IDLH: The chosen IDLH is based on the mouse 4hour LC50 of 2,770 ppm [Fairchild and Stokinger 1958 cited by ACGIH 1971]. . . . Human data: None relevant for use in determining the revised IDLH.

Vapor Pressure

529 mm Hg

Odor Threshold Low

9.8E-5 ppm

Odor Threshold High

0.003 ppm

Lethal Concentration

LC50 (rat) = 4,420 ppm/4H

Explanatory Notes

Detection odor threshold from AIHA (mean = 0.00035 ppm); Flash point = -48.3 C;

Flammability (NFPA)

4: Burns readily

Adverse Effects
Hepatotoxin

Hepatotoxin, Secondary

Other Poison

Chemical Asphyxiant

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information

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Chemical Information

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Related Information in HazMap
Other Information

No other related information on this agent was found.