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Paraffins, waxes and cycloalkanes

Decalin

Also known as Decahydronaphthalene, Naphthan, Dekalin

CAS 91-17-8Formula C10H18Molar mass 138.25 g/molEC 202-046-9
GHS signal word: Danger. Pictograms: Flammable, Corrosive, Acute toxicity (severe), Harmful or irritant 56 suppliers listed
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Decalin chemical structure, C10H18, CAS 91-17-8
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Clear colorless liquid
Melting point
-43 °C
Boiling point
155.5 °C
Density
Relative density (water = 1): 0.87-0.90
Flash point
54 °C
HS code
290219
Category
Paraffins, waxes and cycloalkanes
UN number
UN 1147
Illustrative photo, 25 litre white jerry cans of liquid in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Decalin?

Plain description, key identifiers and synonyms

Decalin is an ortho-fused bicyclic hydrocarbon that is the decahydro- derivative of naphthalene. It has a role as a solvent.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
1,2,3,4,4a,5,6,7,8,8a-decahydronaphthalene
CAS number
91-17-8 CAS number cross-checkedOther or deprecated CAS: 493-01-6, 493-02-7
EC numbers
202-046-9, 207-770-9, 207-771-4, 649-010-2
Molecular formula
C10H18
UNII
88451Q4XYF, J76YZV5DHN, P6NFB27K45
MDL number
MFCD00004130, MFCD00064189, MFCD00064191
InChIKey
NNBZCPXTIHJBJL-UHFFFAOYSA-N
InChI
InChI=1S/C10H18/c1-2-6-10-8-4-3-7-9(10)5-1/h9-10H,1-8H2
SMILES (canonical and isomeric)
C1CCC2CCCCC2C1

Synonyms

  • Decahydronaphthalene
  • Naphthan
  • Dekalin
  • Perhydronaphthalene
  • Naphthalene, decahydro-
  • Naphthalane
  • Naphthane
  • Dekalina
  • Bicyclo[4.4.0]decane
  • Decahydronaphthalin
  • Bicyclo(4.4.0)decane
  • cis-Decahydronaphthalene
  • trans-Decahydronaphthalene
  • cis-Decalin
  • trans-Decalin
  • De-kalin
  • cis-Perhydronaphthalene
  • t-decalin
  • Naphthalene, decahydro-, cis-
  • cis-Bicyclo[4.4.0]decane
  • trans-Perhydronaphthalene
  • trans-Bicyclo[4.4.0]decane
  • Naphthalene, decahydro-, trans-
  • Decahydronaphthalene, trans-
  • (4ar,8ar)-decahydronaphthalene
Show all 37 synonyms
  • c-decalin
  • Dekahydronaphthalin
  • c-decahydronaphthalene
  • (4as,8as)-decahydronaphthalene
  • Bicyclo(4.4.0) decane
  • cis-Bicyclo(4.4.0)decane
  • trans-Bicyclo(4.4.0)decane
  • Decahydronaphthalene (Mixture of Cis + Trans)
  • trans decalin
  • Decalin, trans-
  • decahydronaphtalene
  • Decalin(R)

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

Appearance
Clear colorless liquidexp.
Odour
Slight odor resembling menthol, pure decalin does not smell of naphthaleneexp.
Melting point
-43 °Cexp.
Boiling point
155.5 °Cexp.
Density
Relative density (water = 1): 0.87-0.90exp.
Flash point
54 °Cexp.
Autoignition temperature
250 °Cexp.
Solubility
In water, 0.889 mg/l @ 25 °Cexp.
Vapour pressure
VP: 1 mm Hg @ 22.5 °C /cis-Form/exp.

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
138.25 g/molcalc.
Exact mass
138.1409 Dacalc.
LogP (octanol/water)
3.37calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
10calc.
Rings
2calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, C1CCC2CCCCC2C1

C1CCC2CCCCC2C1

2 rings, 10 atoms. This chemical is the scaffold itself.

383 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS02: Flammable
Flammable
GHS05: Corrosive
Corrosive
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS07: Harmful or irritant
Harmful or irritant
GHS08: Serious health hazard
Serious health hazard
GHS09: Hazardous to the environment
Hazardous to the environment
210NFPA 704 rating

Hazard statements

  • H226Flammable liquid and vapour.
  • H304May be fatal if swallowed and enters airways.
  • H314Causes severe skin burns and eye damage.
  • H318Causes serious eye damage.
  • H331Toxic if inhaled.
  • H332Harmful if inhaled.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
  • H411Toxic to aquatic life with long lasting effects.
Precautionary statements (30)
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P233Keep container tightly closed.
  • P240Ground and bond container and receiving equipment.
  • P241Use explosion-proof electrical, ventilating and lighting equipment.
  • P242Use non-sparking tools.
  • P243Take action to prevent static discharges.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • 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.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • P302 + P361 + P354If on skin: Take off immediately all contaminated clothing. Immediately rinse with water for several minutes.
  • P303 + P361 + P353If on skin (or hair): Take off immediately all contaminated clothing. Rinse skin with water or shower.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P317Get medical help.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P331Do not induce vomiting.
  • P363Wash contaminated clothing before reuse.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P391Collect spillage.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P403 + P235Store in a well-ventilated place. Keep cool.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 1147
Transport hazard class
3
Packing group
III

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

Decalin suppliers

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

All 56 suppliers
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Where suppliers are based

56 suppliers in 13 countries

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Decalin 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

Solvent for naphthalene, fats, resins, oils, waxes, used instead of turpentine in lacquers, shoe polishes, floor waxes. In motor fuel and lubricants. As patent fuel in stoves.

In research as pharmacological, noncarcinogenic vehicle in long-term skin painting and somatic mutation studies.

Solvent for oils, fats, waxes, resins, rubber. Substitute for turpentine: cleaning machinery, stain remover, shoe creams, floor waxes, cleaning fluids, lubricants, motor-fuel additives.

Industrial uses: Solvent, Fuel.

Consumer uses: Solvent.

Roles

  • solvent

Functional uses

  • Solvent

How it is made

Hydrogenation of naphthalene in glacial acetic acid in presence of platinum catalyst @ 25 °c & 130 atm yields mixt of 77% cis-decalin & 23% trans-decalin. Hydrogenation of tetralin under same conditions yields almost only cis-decalin. ... Hydrogenation of delta-4a(8a)-octalin in ethanol in presence of platinum yields trans-decalin as main component.

By treatment of naphthalene in fused state (above 100 °c) with hydrogen in presence of copper or nickel catalyst.

Decalin is produced by liquid-phase hydrogenation of naphthalene under pressure in the presence of nickel catalysts. The proportion of the two stereoisomers formed depends on the reaction conditions.

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 Decalin is traded under.

HS 2902.19Indicative HS code

Cyclanes, cyclenes and cycloterpenes, other

World exports in 2024
$979M
+24.3% vs 2023, imports $1B
2019 to 2024
Top exporters
  1. China23.4%
  2. United States20.6%
  3. Germany13.6%
Top importers
  1. India * partner reported9.9%
  2. United States9.8%
  3. South Korea9.5%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

Quick answers about Decalin, based on the data on this page

What is Decalin?

Decalin is an ortho-fused bicyclic hydrocarbon that is the decahydro- derivative of naphthalene. It has a role as a solvent.

What is the CAS number of Decalin?

The CAS registry number of Decalin is 91-17-8. Other or deprecated CAS numbers: 493-01-6, 493-02-7.

What is the molecular formula and weight of Decalin?

The molecular formula of Decalin is C10H18 and its molar mass is 138.25 g/mol.

What is Decalin used for?

Solvent for naphthalene, fats, resins, oils, waxes, used instead of turpentine in lacquers, shoe polishes, floor waxes. In motor fuel and lubricants. As patent fuel in stoves. In research as pharmacological, noncarcinogenic vehicle in long-term skin painting and somatic mutation studies.

Is Decalin hazardous?

Decalin carries the GHS signal word "Danger". Main hazards: flammable liquid and vapour, may be fatal if swallowed and enters airways, causes severe skin burns and eye damage. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Decalin?

Decalin is usually classified under HS code 290219 (Cyclanes, cyclenes and cycloterpenes, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Decalin?

CompoundList lists 56 suppliers of Decalin in China, United States, India, Japan and 9 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Decalin in India?

7 suppliers in India list Decalin on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Decalin?

Suppliers quote Decalin 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 Decalin

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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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