Dimethicone

Dimethicone is also known as polydimethylsiloxane or PDMS. It is a high-purity linear silicone polymer. Its CAS number is 63148-62-9.

What Is Dimethicone?

Dimethicone is a fully methylated linear siloxane polymer.

It appears as a clear, colorless, odorless liquid. It is non-volatile.

It is hydrophobic. It resists oxidation. It resists heat. It resists water.

Key Properties and Benefits

• Appearance: Clear, transparent, odorless viscous liquid
• Non-toxic and hypoallergenic: Safe for topical use; does not clog pores (non-comedogenic)
• Thermal and chemical stability: Maintains performance across wide temperature ranges
• Low surface tension: Provides excellent spreadability and smoothness
• Water-repellent and breathable: Forms a protective film that reduces moisture loss without suffocating skin
• High lubricity and antifoaming: Reduces friction and controls foam in processing
• Compatibility: Works seamlessly with most organic ingredients and solvents

Common Applications

Cosmetics and Personal Care

Used in moisturizers, creams, lotions, sunscreens, foundations, primers, shampoos, conditioners, and hair serums.

It imparts a velvety, silky finish, improves spreadability, detangles hair, adds shine, and protects skin from environmental irritants.

Pharmaceuticals and Medical

Functions as a skin protectant in ointments, creams, and barrier products. Also serves as an antifoaming agent (often combined as simethicone) in digestive aids to relieve gas and bloating.

Industrial Uses

Acts as a lubricant, mold release agent, defoamer in chemical processing, textile softener, polish additive, and heat-transfer fluid. Suitable for paints, coatings, leather treatment, and electronics.

Technical Specifications (Typical Values)

Dimethicone is offered in multiple viscosity grades to match specific formulation needs:

Custom viscosities, packaging (drums, IBCs, or small containers), and technical support are available upon request.

Frequently Asked Questions (FAQs)

What is the difference between Dimethicone and other silicones?

Dimethicone refers specifically to polydimethylsiloxane (linear PDMS).

Is Dimethicone safe for skin and hair?

Yes.

• Dimethicone is safe in cosmetics, as confirmed by CIR and worldwide regulators.
• It is non-irritating, non-sensitizing, and non-comedogenic.
• It does not penetrate the skin.

Does Dimethicone clog pores or cause acne?

No. Dimethicone is non-comedogenic and forms a breathable film that allows skin to function normally while preventing moisture loss.

Can Dimethicone be used in natural or clean beauty formulations?

Yes. Although synthetic, it is widely accepted in clean beauty lines for its proven safety, performance, and ability to reduce the need for heavier occlusives.

Is Dimethicone environmentally friendly?

Dimethicone is highly stable and does not readily break down into harmful substances. It is not considered a volatile organic compound (VOC) and has low aquatic toxicity when used responsibly.

What viscosity grade should I choose for my product?

Low-viscosity grades (5–50 cSt) suit light serums and sprays; medium grades (100–350 cSt) work well in lotions and creams; high-viscosity grades (>1,000 cSt) provide richer emolliency in balms and hair treatments.

How should Dimethicone be stored?

Store in a cool, dry place away from direct sunlight and strong oxidizers. Keep containers tightly sealed to prevent contamination.

Is Dimethicone compatible with other ingredients?

It is compatible with most oils, waxes, esters, and active ingredients used in cosmetic and industrial formulations.

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