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C9-13 ISOPARAFFIN.

Valuable CAS 246538-72-7 / SOLVENT, VISCOSITY CONTROLLING

A high-purity mixture of branched-chain hydrocarbons that serves as a lightweight solvent and texture enhancer. It is prized in precision skincare for its ability to provide a weightless, silky finish while improving the spreadability of complex formulations.

Solvent Viscosity Controlling Emollient Texture Modifier

Science

It functions as an emollient by filling the interstitial spaces between corneocytes, instantly smoothing the skin's surface. Additionally, it creates a semi-occlusive, breathable barrier that minimizes transepidermal water loss (TEWL) and acts as a viscosity regulator to ensure even distribution of active ingredients.


Research

High confidence
Effective range 0.1–90%
Optimal

16%

Key findings

  1. 01 Cosmetic Ingredient Review (CIR) Expert Panel (2010) safety assessment confirming non-sensitizing and non-genotoxic profiles.
  2. 02 Clinical patch testing at 16% concentration demonstrating zero evidence of irritation or sensitization in human volunteers.

Transparency

Not commonly dusted
Min. effective
1%
Red flag below
0.1%

As a functional solvent and texture modifier, this ingredient is rarely used for 'label claims.' However, levels below 1% in oil-based formulas may indicate it is present only as a carry-over from other raw material blends rather than providing meaningful emolliency.


The Formula

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Highly stable and chemically inert. It remains effective across a wide pH spectrum and does not degrade or react with typical bioactive compounds.

Synergies

  • Lipophilic UV filters
  • Mineral pigments
  • Dimethicone

Conflicts

  • Strong oxidizing agents
  • Highly polar aqueous phases without robust emulsification

Safety

CIR Status
Safe as used
Max tested
90%
Pregnancy
Safe
Sensitization risk Low

Recognized as safe for direct food contact by the FDA, reinforcing its high biocompatibility profile.


Your Skin

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

Our Assessment

Valuable

An essential formulation tool for achieving superior product spreadability and non-greasy moisture retention across all skin types.


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