What is Pentaerythritol CAS 115-77-5?

Pentaerythritol CAS 115-77-5 is a tetrahydric polyol with the formula C5H12O4 and a molecular weight of about 136.15. It is also known as tetramethylolmethane or monopentaerythritol and is normally supplied as a white crystalline powder.

What is the difference between 95% and 98% Pentaerythritol?

The percentage refers mainly to monopentaerythritol content, with 98% grade offering a higher fraction of the tetraol and lower dipentaerythritol or related by-products. Both are industrial resin grades, but 98% is often preferred where more consistent hydroxyl functionality and resin performance are required.

Why is Pentaerythritol used in alkyd resin coatings?

It provides four primary hydroxyl groups per molecule, which increases branching in the resin backbone and improves hardness, gloss, drying speed, and durability. This makes it a common polyol in architectural and industrial alkyd coatings and varnishes.

How is CAS 115-77-5 used in intumescent flame-retardant systems?

Pentaerythritol acts as a carbon source or carbonific agent, often combined with ammonium polyphosphate and a blowing agent. Under heat, the system forms an insulating char layer that helps protect plastics, coatings, and other substrates.

What other industrial applications does Pentaerythritol support?

It is esterified with fatty acids to make high-stability synthetic lubricant esters, used to produce pentaerythritol tetraacrylate for UV-curable systems, and serves as a raw material for antioxidants and PVC stabilizers.

What are the key specifications of the resin grade?

Typical resin-grade specifications include monopentaerythritol content of at least 98.0%, melting point at or above 258 C, hydroxyl content around 48.0-49.5%, low moisture and ash, and a phthalic color of no more than 1 Gardner.

Pentaerythritol CAS 115-77-5

Pentaerythritol, also called tetramethylolmethane, CAS 115-77-5, is a white crystalline tetrahydric polyol supplied for alkyd resin, lubricant, radiation-curing, flame-retardant, and plastic-additive applications. Confirm the required grade and specification, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 115-77-5
Synonyms: Tetramethylolmethane, 2,2-Bis(hydroxymethyl)-1,3-propanediol, Monopentaerythritol, Pentaerythrite
Einecs: 204-104-9
Molecular Formula: C5H12O4
Grade: Industrial Grade (95% / 98%)
Package: 25kg/bag, 500kg/bag, or 1000kg/bag (woven bags with PE liner)

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Product Description

Pentaerythritol CAS 115-77-5, also called tetramethylolmethane, is a tetrahydric polyol with the molecular formula C5H12O4 and EINECS 204-104-9.

Synonyms: Tetramethylolmethane; 2,2-Bis(hydroxymethyl)-1,3-propanediol; Monopentaerythritol; Pentaerythrite.

CAS: 115-77-5.

Molecular formula: C5H12O4.

It is supplied as a white crystalline powder with monopentaerythritol content of at least 98.0%.

Melting point is not less than 258 °C, hydroxyl content about 48.0-49.5%, and moisture (loss on drying) not more than 0.2%.

Ash content is not more than 0.05% and phthalic color (Gardner) not more than 1.

It provides four primary hydroxyl groups per molecule for highly branched resin structures.

In alkyd resins it is the primary polyol, improving hardness, gloss, drying speed, and durability of coatings.

In synthetic lubricants it is esterified with fatty acids to produce high-stability polyol esters for aviation and automotive lubricants.

In radiation curing it is an intermediate for pentaerythritol tetraacrylate (PETA) used in UV-curable inks and coatings.

In flame retardants it is a carbon source in intumescent systems, and in plastic additives it is a raw material for antioxidants and PVC stabilizers.

Store in a cool, dry, well-ventilated warehouse away from strong oxidizers, acids, and open flames, with container integrity maintained.

It is non-hazardous but dust inhalation should be avoided; wear safety goggles, industrial gloves, and an N95 dust mask.

Use adequate local exhaust ventilation in processing areas and maintain good industrial hygiene.

Every batch is analyzed by HPLC for monopentaerythritol content and GC for by-product levels, with particle-size and moisture control.

Confirm appearance, monopentaerythritol content, melting point, hydroxyl content, moisture, ash, color, packaging, and grade as required.

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

For an RFQ, state the intended application, required grade, quantity, packaging, destination, and document needs.

FAQ - Technical & Supply Chain

Q:
What is Pentaerythritol CAS 115-77-5?

A: Pentaerythritol CAS 115-77-5 is a tetrahydric polyol with the formula C5H12O4 and a molecular weight of about 136.15. It is also known as tetramethylolmethane or monopentaerythritol and is normally supplied as a white crystalline powder.
Q:
What is the difference between 95% and 98% Pentaerythritol?

A: The percentage refers mainly to monopentaerythritol content, with 98% grade offering a higher fraction of the tetraol and lower dipentaerythritol or related by-products. Both are industrial resin grades, but 98% is often preferred where more consistent hydroxyl functionality and resin performance are required.
Q:
Why is Pentaerythritol used in alkyd resin coatings?

A: It provides four primary hydroxyl groups per molecule, which increases branching in the resin backbone and improves hardness, gloss, drying speed, and durability. This makes it a common polyol in architectural and industrial alkyd coatings and varnishes.
Q:
How is CAS 115-77-5 used in intumescent flame-retardant systems?

A: Pentaerythritol acts as a carbon source or carbonific agent, often combined with ammonium polyphosphate and a blowing agent. Under heat, the system forms an insulating char layer that helps protect plastics, coatings, and other substrates.
Q:
What other industrial applications does Pentaerythritol support?

A: It is esterified with fatty acids to make high-stability synthetic lubricant esters, used to produce pentaerythritol tetraacrylate for UV-curable systems, and serves as a raw material for antioxidants and PVC stabilizers.
Q:
What are the key specifications of the resin grade?

A: Typical resin-grade specifications include monopentaerythritol content of at least 98.0%, melting point at or above 258 C, hydroxyl content around 48.0-49.5%, low moisture and ash, and a phthalic color of no more than 1 Gardner.

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