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Aliphatic and alicyclic building blocks

1-Octadecanethiol

Also known as Stearyl mercaptan, n-Octadecyl mercaptan, Octadecyl mercaptan

CAS 2885-00-9Formula C18H38SMolar mass 286.57 g/molEC 220-744-1
GHS signal word: Warning. Pictograms: Harmful or irritant 14 suppliers listed
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1-Octadecanethiol chemical structure, C18H38S, CAS 2885-00-9
2D chemical structure

Key facts

What buyers check first

All properties
Physical form
Powder
Melting point
24 to 31
Density
Relative density (water = 1): 0.85
Flash point
185 °C
Solubility
Solubility in water: none
HS code
293090
Category
Aliphatic and alicyclic building blocks
UN number
UN 1228
Illustrative photo, closed jumbo bulk bags in a warehouse in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is 1-Octadecanethiol?

Plain description, key identifiers and synonyms

1-octadecanethiol appears as white powder with an extremely unpleasant smell. May be harmful by ingestion, inhalation or through skin contact. Eye, skin and respiratory irritant.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
octadecane-1-thiol
CAS number
2885-00-9 CAS number cross-checkedOther or deprecated CAS: 17322-94-0
EC number
220-744-1
Molecular formula
C18H38S
UNII
3V2V92U86E
MDL number
MFCD00004886
InChIKey
QJAOYSPHSNGHNC-UHFFFAOYSA-N
InChI
InChI=1S/C18H38S/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19/h19H,2-18H2,1H3
SMILES (canonical and isomeric)
CCCCCCCCCCCCCCCCCCS

Synonyms

  • Stearyl mercaptan
  • n-Octadecyl mercaptan
  • Octadecyl mercaptan
  • 1-Mercaptooctadecane
  • n-octadecanethiol
  • octadecylthiol
  • 1-Octadecyl mercaptan
  • octadecane-1-thiol
  • Octadecanethiol
  • Octadecanthiol
  • stearylmercaptan
  • octadecane thiol
  • 1-octadecanthiol
  • Octadecylmercaptan
  • 1-octadecylmercaptan
  • 1-Octadecanethiol, 98%
  • 1-Octadecanethiol, purum, >=95.0% (GC)

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Physical form
Powderexp.
Melting point
24 to 31exp.
Density
Relative density (water = 1): 0.85exp.
Flash point
185 °Cexp.
Solubility
Solubility in water: noneexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
286.57 g/molcalc.
Exact mass
286.2694 Dacalc.
LogP (octanol/water)
7.18calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
16calc.
Heavy atoms
19calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (1 violation)calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
  • H413May cause long lasting harmful effects to aquatic life.
Precautionary statements (17)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 1228

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

1-Octadecanethiol suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 14 suppliers
14 of 14 offers

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Where suppliers are based

14 suppliers in 5 countries

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1-Octadecanethiol price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code 1-Octadecanethiol is traded under.

HS 2930.90Indicative HS code

Organo-sulphur compounds, other

World exports in 2024
$5.83B
+0.1% vs 2023, imports $5.93B
2019 to 2024
Top exporters
  1. China40.7%
  2. United States10.9%
  3. Japan9.3%
Top importers
  1. United States13.3%
  2. Brazil12.6%
  3. China6.6%
Reported customs values in USD, not prices.Full trade data

The HS code shown for 1-Octadecanethiol is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about 1-Octadecanethiol, based on the data on this page

What is 1-Octadecanethiol?

1-octadecanethiol appears as white powder with an extremely unpleasant smell. May be harmful by ingestion, inhalation or through skin contact. Eye, skin and respiratory irritant.

What is the CAS number of 1-Octadecanethiol?

The CAS registry number of 1-Octadecanethiol is 2885-00-9. Other or deprecated CAS numbers: 17322-94-0.

What is the molecular formula and weight of 1-Octadecanethiol?

The molecular formula of 1-Octadecanethiol is C18H38S and its molar mass is 286.57 g/mol.

What is 1-Octadecanethiol used for?

Known uses and roles of 1-Octadecanethiol include building blocks in research and laboratory.

Is 1-Octadecanethiol hazardous?

1-Octadecanethiol carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of 1-Octadecanethiol?

1-Octadecanethiol is usually classified under HS code 293090 (Organo-sulphur compounds, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy 1-Octadecanethiol?

CompoundList lists 14 suppliers of 1-Octadecanethiol in China, Switzerland, Germany, Iran and 1 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of 1-Octadecanethiol?

Suppliers quote 1-Octadecanethiol on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle 1-Octadecanethiol

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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