What is Trimethylolpropane (TMP)?

Trimethylolpropane, also called TMP or 2-ethyl-2-(hydroxymethyl)propane-1,3-diol, has CAS 77-99-6 and molecular formula C₆H₁₄O₃. It is a white crystalline trifunctional polyol used in resins and coatings.

What specifications should be checked before ordering?

Confirm assay, hydroxyl value, moisture, color, melting range and carbonyl or acid content. The listed material is 99% minimum; request the batch analysis for the actual purity and method, especially for moisture-sensitive polyurethane applications.

How should TMP be stored and handled?

Store in tightly closed containers in a cool, dry, ventilated area, away from moisture and strong oxidizers. Use dust controls and suitable PPE, and follow the safety information for spill, disposal and first-aid procedures.

How do the three hydroxyl groups affect TMP performance?

TMP has three primary hydroxyl groups on a branched backbone, allowing it to form higher-functionality polyesters, alkyds and urethane networks than a simple diol. This increases branching, crosslink density, hardness and chemical resistance.

Trimethylolpropane CAS 77-99-6

Trimethylolpropane (TMP), CAS 77-99-6, is a white crystalline trifunctional polyol used in alkyd resins, polyester resins, polyurethane systems and UV-curable resins. Confirm the required assay, hydroxyl value and moisture for the intended application.

CAS: 77-99-6
Synonyms: TMP, 1,1,1-Trimethylolpropane, 2-ethyl-2-(hydroxymethyl)propane-1,3-diol, Propylidynetrimethanol, Hexaglycerine
Einecs: 201-074-9
Molecular Formula: C₆H₁₄O₃
Grade: Industrial grade 99%
Package: 25kg/bag

Request a quote

Share:

Product Description

Trimethylolpropane, CAS 77-99-6, is 2-ethyl-2-(hydroxymethyl)propane-1,3-diol, a trifunctional polyol abbreviated TMP; the EC/EINECS number is 201-074-9.

Synonyms: TMP; 1,1,1-Trimethylolpropane; 2-ethyl-2-(hydroxymethyl)propane-1,3-diol; Propylidynetrimethanol; Hexaglycerine.

CAS: 77-99-6.

Molecular formula: C₆H₁₄O₃.

Molecular weight: 134.17.

EC number: 201-074-9.

It is normally supplied as white flaky crystals that are easily soluble in water, low-carbon alcohols, glycerin and N,N-dimethylformamide.

Typical properties include density of about 1.116 g/cm³, melting point of about 56-60 °C, boiling point of about 295.7 °C and flash point of about 172 °C.

It is used in alkyd resins, polyester resins, polyurethane systems, UV-curable resins, synthetic lubricants, printing inks and PVC heat stabilizers.

Its three primary hydroxyl groups on a branched backbone provide higher functionality than a simple diol, increasing branching, crosslink density, hardness and chemical resistance.

Confirm assay, hydroxyl value, moisture, color, melting range and carbonyl or acid content.

Store in tightly closed containers in a cool, dry, ventilated area away from moisture and strong oxidizers, and use dust controls with suitable PPE.

Confirm the current product-specific specification.

Confirm packaging with the requested quantity and destination requirements.

Document requirements should be confirmed from the current specification, SDS, COA, or other product-specific files.

Regulated-use suitability must be confirmed separately with current product-specific documentation.

The page is an RFQ entry point and does not state stock, price, MOQ, or fixed lead time.

For an RFQ, state the intended use, required specification, quantity, packaging, destination, and document needs.

FAQ - Technical & Supply Chain

Q:
What is Trimethylolpropane (TMP)?

A: Trimethylolpropane, also called TMP or 2-ethyl-2-(hydroxymethyl)propane-1,3-diol, has CAS 77-99-6 and molecular formula C₆H₁₄O₃. It is a white crystalline trifunctional polyol used in resins and coatings.
Q:
What is TMP mainly used for?

A: It is used in alkyd resins, polyester resins, polyurethane systems, UV-curable resins, synthetic lubricants, printing inks and PVC heat stabilizers. Its three hydroxyl groups provide branching and crosslink density.
Q:
What specifications should be checked before ordering?

A: Confirm assay, hydroxyl value, moisture, color, melting range and carbonyl or acid content. The listed material is 99% minimum; request the batch analysis for the actual purity and method, especially for moisture-sensitive polyurethane applications.
Q:
How should TMP be stored and handled?

A: Store in tightly closed containers in a cool, dry, ventilated area, away from moisture and strong oxidizers. Use dust controls and suitable PPE, and follow the safety information for spill, disposal and first-aid procedures.
Q:
How do the three hydroxyl groups affect TMP performance?

A: TMP has three primary hydroxyl groups on a branched backbone, allowing it to form higher-functionality polyesters, alkyds and urethane networks than a simple diol. This increases branching, crosslink density, hardness and chemical resistance.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

Current Language

Change Language