What is Dimethiconol CAS 31692-79-2?

Dimethiconol CAS 31692-79-2 is a hydroxy-terminated linear polydimethylsiloxane, also listed as INCI Dimethiconol. It is a clear, colorless, odorless silicone gum or high-viscosity fluid used mainly as a conditioning agent, film former, lubricant, release agent, and defoamer base.

How does Dimethiconol CAS 31692-79-2 differ from standard Dimethicone CAS 9006-65-9?

Dimethicone is typically methyl-terminated, while Dimethiconol has reactive hydroxyl groups at the polymer chain ends. This hydroxy termination makes Dimethiconol slightly more polar and substantive to hair and skin, and better suited to durable film-forming or conditioning systems.

Why is Dimethiconol often supplied as a blend with cyclopentasiloxane or low-viscosity dimethicone?

Pure Dimethiconol is an extremely viscous gum that is difficult to pump, dilute, and disperse. Blending it with a volatile silicone carrier such as Cyclopentasiloxane or with low-viscosity Dimethicone produces a pourable liquid while retaining the conditioning and film-forming benefits of Dimethiconol.

What personal-care and cosmetic applications is Dimethiconol suitable for?

It is commonly used in hair conditioners, leave-in treatments, anti-frizz serums, styling products, skin creams, lotions, and color cosmetics. It improves slip and spreadability, reduces tack, forms a smooth hydrophobic film, and helps control frizz without making hair feel heavy.

What physical specifications and storage conditions should be checked for Dimethiconol?

Typical Dimethiconol appears as a colorless to pale yellow, transparent viscous liquid or gum, and its viscosity can range from high-viscosity fluids to semi-solid gum depending on polymer chain length and blending. It should be stored in tightly closed containers away from moisture, high heat, and direct sunlight.

Dimethiconol CAS 31692-79-2

Dimethiconol, CAS 31692-79-2, is a hydroxy-terminated linear polydimethylsiloxane (INCI Dimethiconol) supplied for personal care, cosmetics and industrial applications. Confirm the required grade and specification, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 31692-79-2
Synonyms: Hydroxy-terminated polydimethylsiloxane, Hydroxy-terminated PDMS, Dimethyl siloxane hydroxy-terminated, Silicone Gum, Polydimethylsiloxane diol
Einecs: 608-658-6
Molecular Formula: (C₂H₆OSi)ₙ
Grade: Cosmetic Grade / Industrial Grade / Food Grade (Defoamer base)
Package: 200kg/Iron Drum, 1000kg/IBC Tote, or small plastic drums.

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Product Description

Dimethiconol, CAS 31692-79-2, is a hydroxy-terminated linear polydimethylsiloxane.

Synonyms: Hydroxy-terminated polydimethylsiloxane; Hydroxy-terminated PDMS; Dimethyl siloxane hydroxy-terminated; Silicone Gum; Polydimethylsiloxane diol.

CAS: 31692-79-2.

It is a clear, colorless and odorless silicone gum or high-viscosity fluid.

It has reactive hydroxyl groups at the polymer chain ends, unlike methyl-terminated dimethicone.

It is stable against oxidation and resists temperature extremes and shear breakdown.

It is soluble in non-polar solvents and insoluble in water and ethanol.

It forms a smooth hydrophobic film and provides a non-greasy, velvety skin feel.

It is used as a conditioning agent and film former in hair care products.

It is used in creams, lotions, sunscreens, foundations and primers.

It is used as a mold release agent for rubber, plastic and metal casting.

It is used as a lubricant for belts, O-rings and rubber seals.

It is used in car polishes, tire shine and furniture waxes.

It is used as an antifoam base in petroleum processing and industrial fermentation.

Confirm appearance, odor, viscosity, specific gravity, refractive index, flash point, volatile matter, acid value, heavy metals and solubility.

Store in tightly closed containers in a cool, dry place below 40 °C, away from moisture and direct sunlight.

Confirm packaging with the requested quantity and destination requirements.

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 grade and specification, quantity, packaging, destination and document needs.

FAQ - Technical & Supply Chain

Q:
What is Dimethiconol CAS 31692-79-2?

A: Dimethiconol CAS 31692-79-2 is a hydroxy-terminated linear polydimethylsiloxane, also listed as INCI Dimethiconol. It is a clear, colorless, odorless silicone gum or high-viscosity fluid used mainly as a conditioning agent, film former, lubricant, release agent, and defoamer base.
Q:
How does Dimethiconol CAS 31692-79-2 differ from standard Dimethicone CAS 9006-65-9?

A: Dimethicone is typically methyl-terminated, while Dimethiconol has reactive hydroxyl groups at the polymer chain ends. This hydroxy termination makes Dimethiconol slightly more polar and substantive to hair and skin, and better suited to durable film-forming or conditioning systems.
Q:
Why is Dimethiconol often supplied as a blend with cyclopentasiloxane or low-viscosity dimethicone?

A: Pure Dimethiconol is an extremely viscous gum that is difficult to pump, dilute, and disperse. Blending it with a volatile silicone carrier such as Cyclopentasiloxane or with low-viscosity Dimethicone produces a pourable liquid while retaining the conditioning and film-forming benefits of Dimethiconol.
Q:
What personal-care and cosmetic applications is Dimethiconol suitable for?

A: It is commonly used in hair conditioners, leave-in treatments, anti-frizz serums, styling products, skin creams, lotions, and color cosmetics. It improves slip and spreadability, reduces tack, forms a smooth hydrophobic film, and helps control frizz without making hair feel heavy.
Q:
What physical specifications and storage conditions should be checked for Dimethiconol?

A: Typical Dimethiconol appears as a colorless to pale yellow, transparent viscous liquid or gum, and its viscosity can range from high-viscosity fluids to semi-solid gum depending on polymer chain length and blending. It should be stored in tightly closed containers away from moisture, high heat, and direct sunlight.

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