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Aliphatic and alicyclic building blocks

Tributyl borate

Also known as Tri-n-butyl borate, Tributoxyborane, n-Butyl borate

CAS 688-74-4Formula C12H27BO3Molar mass 230.16 g/molEC 211-706-5
GHS signal word: Danger. Pictograms: Corrosive, Harmful or irritant, Serious health hazard 27 suppliers listed
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Tributyl borate chemical structure, C12H27BO3, CAS 688-74-4
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Water-white liquid
Melting point
<-70
Boiling point
234 °C
Density
0.8567 g/cm³ at 20 °C
Flash point
93.3 °C
HS code
292090
Category
Aliphatic and alicyclic building blocks
UN number
UN 1993
Illustrative photo, 200 litre steel drums of liquid in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Tributyl borate?

Plain description, key identifiers and synonyms

Tributyl borate is a water-white liquid. (NTP, 1992)

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
tributyl borate
CAS number
688-74-4 CAS number cross-checked
EC number
211-706-5
Molecular formula
C12H27BO3
UNII
X3UQ8D0UED
MDL number
MFCD00009434
InChIKey
LGQXXHMEBUOXRP-UHFFFAOYSA-N
InChI
InChI=1S/C12H27BO3/c1-4-7-10-14-13(15-11-8-5-2)16-12-9-6-3/h4-12H2,1-3H3
SMILES (canonical and isomeric)
B(OCCCC)(OCCCC)OCCCC

Synonyms

  • Tri-n-butyl borate
  • Tributoxyborane
  • n-Butyl borate
  • Tributoxyboron
  • Butyl borate
  • Tri-n-butoxyborane
  • Boron tributoxide
  • Borester 2
  • Tris(butoxy)borane
  • Borane, tributoxy-
  • Tributyl orthoborate
  • Butyl borate, tri-
  • Boric acid, tributyl ester
  • Tributoxyborine
  • Boric acid (H3BO3), tributyl ester
  • Boric Acid Tributyl Ester
  • Butyl borate, (BuO)3B
  • Tributylester kyseliny borite
  • Boric acid, (H3BO3) tributyl ester
  • Boric acid tri-n-butyl ester
  • boron tri-n-butoxide
  • 4-01-00-01544 (Beilstein Handbook Reference)
  • Boron tris(butoxide)
  • (n-C4H9O)3B
  • Butyl borate, b(obu)3
Show all 35 synonyms
  • Lgqxxhmebuoxrp-uhfffaoysa-
  • butylborate
  • Trinbutoxyborane
  • nButyl borate
  • Trinbutyl borate
  • Butyl borate, tri
  • Borester
  • Borane, tributoxy
  • tri-n-butylborate
  • Butyl borate, (BuO)3 B

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
Water-white liquidexp.
Odour
Like n-butanolexp.
Melting point
<-70exp.
Boiling point
234 °Cexp.
Density
0.8567 g/cm³ at 20 °Cexp.
Flash point
93.3 °Cexp.
Solubility
Soluble in ethanol, benzene, very soluble in ethyl ether, methanolexp.
Vapour pressure
0.526 mm Hg at 25 °Cexp.

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
230.16 g/molcalc.
Exact mass
230.2053 Dacalc.
LogP (octanol/water)
3.42calc.
Topological polar surface area
27.69 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
12calc.
Heavy atoms
16calc.
Rings
0calc.
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.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS05: Corrosive
Corrosive
GHS07: Harmful or irritant
Harmful or irritant
GHS08: Serious health hazard
Serious health hazard
221NFPA 704 rating

Hazard statements

  • H302Harmful if swallowed.
  • H312Harmful in contact with skin.
  • H315Causes skin irritation.
  • H318Causes serious eye damage.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
  • H360FDMay damage fertility. May damage the unborn child.
Precautionary statements (23)
  • P203Obtain, read and follow all safety instructions before use.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P317If swallowed: Get medical help.
  • 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.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P317Get medical help.
  • P318If exposed or concerned, get medical advice.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • 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 1993

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

Tributyl borate suppliers

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

All 27 suppliers
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Where suppliers are based

27 suppliers in 4 countries

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Tributyl borate 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

Welding fluxes, intermediate in preparation of borohydrides, flame retardant for textiles (with boric acid).

Provides a fast curing system suitable for metal coating.

Industrial uses: Lubricating agent, Intermediate.

How it is made

Reaction of n-butyl alcohol with boron trichloride

From butyl alcohol and boric acid.

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 Tributyl borate is traded under.

HS 2920.90Indicative HS code

Esters, other than thiophosphoric esters (phosphorothioates) and phosphite esters and their salts…

World exports in 2024
$1.05B
+8.0% vs 2023, imports $1.23B
2019 to 2024
Top exporters
  1. China33.4%
  2. Germany18.8%
  3. United States12.4%
Top importers
  1. United States19.2%
  2. Singapore8.9%
  3. South Korea6.9%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

Quick answers about Tributyl borate, based on the data on this page

What is Tributyl borate?

Tributyl borate is a water-white liquid. (NTP, 1992)

What is the CAS number of Tributyl borate?

The CAS registry number of Tributyl borate is 688-74-4.

What is the molecular formula and weight of Tributyl borate?

The molecular formula of Tributyl borate is C12H27BO3 and its molar mass is 230.16 g/mol.

What is Tributyl borate used for?

Welding fluxes, intermediate in preparation of borohydrides, flame retardant for textiles (with boric acid). Provides a fast curing system suitable for metal coating. Industrial uses: Lubricating agent, Intermediate.

Is Tributyl borate hazardous?

Tributyl borate carries the GHS signal word "Danger". Main hazards: harmful if swallowed, harmful in contact with skin, causes skin irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Tributyl borate?

Tributyl borate is usually classified under HS code 292090 (Esters of other inorganic acids of non-metals (excluding esters of hydrogen halides) and…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Tributyl borate?

CompoundList lists 27 suppliers of Tributyl borate in China, United States, India and Germany. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Tributyl borate in India?

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

What is the price of Tributyl borate?

Suppliers quote Tributyl borate 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 Tributyl borate

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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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