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SILICONE QUATERNIUM-16.

Valuable / HAIR CONDITIONING, SKIN CONDITIONING

Silicone Quaternium-16 is a versatile conditioning agent that enhances hair's manageability, softness, and shine, while also supporting skin health. As a water-dispersible silicone, it forms a protective, breathable film without causing buildup, delivering both aesthetic and functional benefits.

Summary

Hair Conditioning Skin Conditioning Antistatic

Science

Mechanism of Action

This ingredient functions primarily as a conditioning agent for both hair and skin. On hair, it facilitates detangling, imparts softness, shine, and volume by forming a protective layer. For the skin, it helps maintain overall condition through a vapor-permeable film created by its silicone structure, which has low surface tension. Its quaternary ammonium cation structure also confers antistatic properties.

Research

Clinical Evidence

Medium confidence
Effective range 0.003–3%
Optimal

1%

Key findings

  1. 01 A shampoo formulated with a 1% w/w silicone quaternary microemulsion (containing Silicone Quaternium-16) demonstrated superior conditioning performance, yielding notably smooth and soft hair.
  2. 02 The Cosmetic Ingredient Review (CIR) Expert Panel deemed a related ingredient, Silicone Quaternium-16/Glycidoxy Dimethicone Crosspolymer, safe for use in cosmetics at concentrations up to 0.003% in leave-on products and 1-3% in rinse-off applications.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 6 – 8
0 7 14

Stability

Formulations incorporating Silicone Quaternium-16 as part of a microemulsion exhibit stability within a pH range of 6.59-7.17. Commercial preparations of microemulsions with this ingredient typically maintain a pH between 6 and 8. As a class, silicone emulsifiers are known for high emulsion stability across broad temperature variations.

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
3%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel concluded that dimethicone crosspolymer ingredients, including a related compound, Silicone Quaternium-16/Glycidoxy Dimethicone Crosspolymer, are safe under current cosmetic use and concentration practices. Specifically, usage concentrations of up to 0.003% in leave-on and 1-3% in rinse-off products were deemed safe. SkinSAFE evaluates Silicone Quaternium-16 as 'Irritant Free', 'Teen SAFE', 'Baby SAFE', and 'Eyelid SAFE'. General silicones are recognized for excellent skin tolerability and a lack of comedogenic effect. While the raw, concentrated form of the material may pose irritation risks, this does not translate to adverse effects in finished cosmetic products at approved concentrations.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

Silicone Quaternium-16 is a valuable conditioning agent, enhancing both hair and skin with superior softening and smoothing properties, backed by a favorable safety profile and broad compatibility across skin types.

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