Hydrogen Dimethicone (CAS 68037-59-2)

Hydrogen Dimethicone – Modified Silicone Fluid for Cosmetic Applications

Basic Information

• CAS Number: 68037-59-2 (also 69013-23-6, 70900-21-9)

• INCI Name: Hydrogen Dimethicone

• Synonyms: Dimethicone/Methicone Copolymer, Dimethylhydropolysiloxane

• Appearance: Clear, colorless, odorless fluid

• Viscosity: ~20 mm²/s (at 25°C)

• Specific Gravity: 0.971 (at 25°C)

• Refractive Index: 1.398 (at 25°C)

• Solubility: Insoluble in water

• Storage: Store in a cool, dry place, away from direct sunlight and moisture

Overview
Hydrogen Dimethicone is a derivative of dimethicone where some of the methyl groups have been replaced with hydrogen atoms. It is a versatile silicone fluid widely used in cosmetics as an emollient, skin-conditioning agent, and surface treatment agent. Its lightweight, non-greasy nature makes it ideal for a wide range of applications, including skincare, haircare, and makeup formulations.

Synthesis
Hydrogen Dimethicone is typically synthesized by reacting dimethicone with hydrogen gas in the presence of a catalyst, resulting in the replacement of some methyl groups with hydrogen atoms.

Key Properties

• Skin conditioning: Acts as an effective emollient, imparting a silky, smooth texture to skin and hair.

• Enhanced spreadability: Improves the even distribution of products, facilitating smooth application.

• Protective barrier: Forms a lightweight, breathable film that helps retain moisture and protect the skin.

• Water repellency: Optimizes water resistance, making it valuable in waterproof and long-wear formulations.

• Surface treatment: Used to treat powder particles, improving their hydrophobicity, adhesion, and feel.

• Reduced greasiness: Helps reduce the greasy feel of cosmetic products, providing a luxurious, non-oily finish.

• Non-comedogenic: Does not clog pores and is unlikely to cause acne.

• Lightweight: Its lightweight nature makes it suitable for lotions, creams, and foundations.

Applications

• Skincare: Lotions, creams, serums, and sunscreens – provides a silky feel, enhances spreadability, and improves the even distribution of UV filters.

• Haircare: Shampoos, conditioners, and styling products – tames frizz and adds shine without greasiness.

• Makeup: Foundations, powders, and primers – used as a surface treatment agent for powders, improving water repellency, adhesion, and feel.

• Color cosmetics: Enhances the texture and performance of powder foundations and other pigmented products.

• Other: Acts as a film-forming agent, lubricant, and anti-foaming agent in various formulations.

Recommended Use
Typical usage levels range from 1–3% of the formulation, depending on the desired effect. For optimal performance, incorporate into the oil phase or use as a surface treatment for powders.

Safety and Handling

• Generally recognized as safe for use in cosmetics at recommended concentrations.

• Low irritation potential; non-comedogenic and well-tolerated by skin.

• Avoid contact with strong oxidizers.

• Store in a cool, dry place, away from direct sunlight and moisture.

• Use appropriate personal protective equipment (gloves, safety goggles) when handling.

Quality Assurance
Each batch is tested for viscosity, specific gravity, refractive index, and volatile content to ensure consistent quality.