Dimethicone 350

Product Name: Dimethicone 350 (Polydimethylsiloxane)

Product Appearance:

• Form: Clear, colorless, odorless liquid.
• Viscosity: 350 cSt—the most common and versatile viscosity for general cosmetic formulation.
• Texture: Exceptionally silky and smooth with “non-oily” lubricity.

Product Solubility:

• Oil: Soluble in most cosmetic esters (like IPM) and dispersible in the oil phase.
• Water: Insoluble.

Possible Usage Rate:

• Face Moisturizers: 1% – 2%
• Body Lotions: 2% – 5%
• Barrier Creams: 5% – 10%
• Hair Serums: 10% – 80% (often blended with Cyclomethicone)

Product Description

Dimethicone 350 is a medium-viscosity silicone polymer that serves as the “gold standard” for improving product aesthetics and performance. It is primarily utilized as a skin protectant, slip modifier, and essential anti-foaming agent. By breaking the surface tension of bubbles within an emulsion, it eliminates the “soaping effect”—the white streaks often found in natural lotions—allowing the product to disappear into the skin instantly. It creates a breathable, non-occlusive “second-skin” film that protects against environmental irritants while preventing moisture loss.

Possible Uses/Applications:

• Daily Moisturizers: To eliminate the “soaping effect” and improve spreadability.
• Protective Hand Creams: Creating a breathable barrier against environmental irritants.
• Conditioning Hair Serums: Adding silkiness and non-oily lubricity to hair strands.
• Oil-Free Skincare: Providing emollience without the use of traditional vegetable oils.

Formulation Guidelines

• The “White Streak” Killer: Adding just 1% Dimethicone 350 typically eliminates formulation “soaping” entirely.
• Oil Phase Integration: Heat-stable and can be added directly to the oil phase alongside waxes and oils.
• Texture Refinement: Provides superior “glide” and reduces the “drag” of heavy natural butters like Shea or Cocoa, resulting in a high-end feel.
• Waterproofness: Adds a protective, water-resistant quality to hand creams and sunscreens.

Safety Guidelines

• Non-Comedogenic: The molecular size is too large to enter or clog pores; it is safe for acne-prone skin.
• Chemically Inert: Does not react with other ingredients, ensuring high stability in complex kits.
• Storage: Store at room temperature. It is incredibly shelf-stable and does not go rancid.