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Humectants

Trimethylolpropane

Also known as 2-Ethyl-2-(hydroxymethyl)-1,3-propanediol, 1,1,1-Tris(hydroxymethyl)propane, Ethriol

CAS 77-99-6Formula C6H14O3Molar mass 134.18 g/molEC 201-074-9
98 suppliers listed
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Trimethylolpropane chemical structure, C6H14O3, CAS 77-99-6
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
White powder or plates
Melting point
58 °C
Boiling point
292 to 297
Density
1.084 g/cm³
Flash point
172 °C
HS code
290541
Category
Humectants
Illustrative photo, fine white powder in a white HDPE jar on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Trimethylolpropane?

Plain description, key identifiers and synonyms

Trimethylolpropane is a primary alcohol.

Trimethylolpropane is an aliphatic triol compound.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2-ethyl-2-(hydroxymethyl)propane-1,3-diol
CAS number
77-99-6 CAS number cross-checked
EC number
201-074-9
Molecular formula
C6H14O3
UNII
090GDF4HBD
MDL number
MFCD00004694
INCI name
TRIMETHYLOLPROPANE
InChIKey
ZJCCRDAZUWHFQH-UHFFFAOYSA-N
InChI
InChI=1S/C6H14O3/c1-2-6(3-7,4-8)5-9/h7-9H,2-5H2,1H3
SMILES (canonical and isomeric)
CCC(CO)(CO)CO

Synonyms

  • 2-Ethyl-2-(hydroxymethyl)-1,3-propanediol
  • 1,1,1-Tris(hydroxymethyl)propane
  • Ethriol
  • Hexaglycerine
  • Etriol
  • Ettriol
  • TMP (alcohol)
  • Propylidynetrimethanol
  • 1,1,1-Trimethylolpropane
  • Ethyltrimethylolmethane
  • 1,3-Propanediol, 2-ethyl-2-(hydroxymethyl)-
  • Tri(hydroxymethyl)propane
  • Tris(hydroxymethyl)propane
  • 2,2-Bis(hydroxymethyl)-1-butanol
  • Methanol, (propanetriyl)tris-
  • 2-Ethyl-2-(hydroxymethyl)propanediol
  • Propane, 1,1,1-tris(hydroxymethyl)-
  • 2-ethyl-2-(hydroxymethyl)propane-1,3-diol
  • Trimethylol propane
  • 1,1,1-Tri(hydroxymethyl)propane
  • 2-Ethyl-2-hydroxymethyl-1,3-propanediol
  • Propanediol, 2-ethyl-2-(hydroxymethyl)-, 1,3-
  • trimethylol-propane
  • 1,1-Trimethylolpropane
  • Ethyl-2-(hydroxymethyl)-1,3-propanediol
Show all 37 synonyms
  • trimethylolpropane (TMP)
  • 4-01-00-02786 (Beilstein Handbook Reference)
  • 1,1-Tris(hydroxymethyl)propane
  • 1, 2-ethyl-2-(hydroxymethyl)-
  • Propane,1,1-tris(hydroxymethyl)-
  • Butanol, 2,2-bis(hydroxymethyl)-
  • 1,1,1-Tris(hydroxymethyl)propane, 97%
  • 2-Ethyl-2-hydroxymethyl-propan-1,3-diol
  • 2-ethyl-2-hydroxymethyl-propane-1,3-diol
  • 2-ethyl-2-hydroxymethyl-1,3-dihydroxypropane
  • Trimethylolpropane Solution in Methanol, 100ug/mL
  • 1,1,1-Tris(hydroxymethyl)propane, dist., >=98.0% (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

Appearance
White powder or platesexp.
Melting point
58 °Cexp.
Boiling point
292 to 297exp.
Density
1.084 g/cm³exp.
Flash point
172 °Cexp.
Autoignition temperature
Ca. 375exp.
Solubility
SOL IN ALL PROP IN WATER, ALCOHOL, INSOL IN BENZENE, CARBON TETRACHLORIDEexp.

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
134.18 g/molcalc.
Exact mass
134.0943 Dacalc.
LogP (octanol/water)
-0.64calc.
Topological polar surface area
60.69 Ųcalc.
Hydrogen bond donors
3calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
4calc.
Heavy atoms
9calc.
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 classification
Hazard pictograms

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

Trimethylolpropane suppliers

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

All 98 suppliers
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Where suppliers are based

98 suppliers in 21 countries

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Trimethylolpropane 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

Conditioning agent, manufacture of varnishes, alkyd resins, synthetic drying oils, urethane foams & coatings, silicone lube oils, lactone plasticizers, textile finishes, surfactants, epoxidation products.

Chemical intermediate for polyesters for polyurethane foams.

Chemical intermediate for polyesters for alkyd surface coatings.

Chemical intermediate for plastictzers, eg, the triheptanoate ester.

Industrial uses: Waterproofing agent, Plasticizer, Hardener, Pigment, Intermediate, Other, Lubricating agent.

Consumer uses: Pigment, Lubricating agent, Solvent, Polymerization promoter, Monomers, Processing aids not otherwise specified.

Use classes: Plastics.

Cosmetic ingredient, INCI name TRIMETHYLOLPROPANE(humectant, solvent)

Functional uses

  • Chemical reaction regulator
  • Heat stabilizer
  • Humectant
  • Processing aids not otherwise specified
  • Solvent

Cosmetic functions

  • Humectant
  • Solvent

How it is made

Aldol condensation of n-butyraldehyde with excess formaldehyde in the presence of a base catalyst, eg, sodium hydroxide

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory

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 Trimethylolpropane is traded under.

HS 2905.41Exact HS code

2-Ethyl-2-(hydroxymethyl)propane-1,3-diol (trimethylolpropane)

World exports in 2024
$68.2M
−6.6% vs 2023, imports $150M
2019 to 2024
Top exporters
  1. China84.5%
  2. United States5.6%
  3. United Arab Emirates * partner reported3.4%
Top importers
  1. United States14.5%
  2. South Korea13.2%
  3. Germany11.2%

* Partner reported figures, a lower bound.

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

The HS code shown for Trimethylolpropane is indicative (it was matched by name in the HS nomenclature). Confirm the classification with your customs broker before shipping.

Frequently asked questions

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

What is Trimethylolpropane?

Trimethylolpropane is a primary alcohol.

What is the CAS number of Trimethylolpropane?

The CAS registry number of Trimethylolpropane is 77-99-6.

What is the molecular formula and weight of Trimethylolpropane?

The molecular formula of Trimethylolpropane is C6H14O3 and its molar mass is 134.18 g/mol.

What is Trimethylolpropane used for?

Conditioning agent, manufacture of varnishes, alkyd resins, synthetic drying oils, urethane foams & coatings, silicone lube oils, lactone plasticizers, textile finishes, surfactants, epoxidation products. Chemical intermediate for polyesters for polyurethane foams.

Is Trimethylolpropane hazardous?

No GHS hazard classification for Trimethylolpropane is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Trimethylolpropane?

Trimethylolpropane is usually classified under HS code 290541 (2-Ethyl-2-(hydroxymethyl)propane-1,3-diol (trimethylolpropane)). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Trimethylolpropane?

CompoundList lists 98 suppliers of Trimethylolpropane in China, United States, India, Japan and 17 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Trimethylolpropane in India?

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

What is the price of Trimethylolpropane?

Suppliers quote Trimethylolpropane 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 Trimethylolpropane

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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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