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Moumoujus

MICROCRYSTALLINE WAX.

Valuable CAS 63231-60-7 / BINDING, BULKING, EMULSION STABILISING, VISCOSITY CONTROLLING

Microcrystalline Wax is a highly refined petroleum-derived wax valued for its multifunctional properties in skincare formulations. It creates a lightweight, protective film on the skin to minimize moisture loss and acts as a key structural component, enhancing product stability and delivering a luxurious, creamy texture.

Summary

viscosity controlling emollient emulsion stabilising binding agent film-forming

Science

Mechanism of Action

This wax functions primarily as an occlusive agent, forming a non-tacky film on the skin's surface that effectively reduces transepidermal water loss (TEWL) and supports prolonged hydration. Its unique dense, branched structure allows it to bind oils, serving as an effective structuring and binding agent within emulsions. This structural capability enhances product stability by preventing phase separation and contributes to desired rheology and texture, imparting a smooth, stiff consistency and a rich, creamy feel. It also contributes to the tensile strength and flexibility of solid stick formulations.

Research

Clinical Evidence

Insufficient-data confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Microcrystalline Wax is a hydrophobic solid with a high melting point, typically ranging from 60°C to 90°C (and sometimes up to 102°C depending on the grade), which contributes significantly to product stability across varying temperatures. It is insoluble in water but readily dissolves in hot cosmetic emollients. Upon cooling, it forms small crystals that effectively bind oils and provide a robust structure, preventing 'sweating' (oil separation) in solid formulations like lipsticks. However, excessive use can lead to brittle stick products.

Synergies

  • various oils
  • esters
  • humectants
  • silicones

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel concluded Microcrystalline Wax is safe for use in cosmetics based on current practices and concentrations, without a re-evaluation needed as of September 2025. Regulatory bodies including the U.S. Food and Drug Administration (FDA) and the European Union Cosmetics Directive acknowledge its safety. The SCCS (Scientific Committee on Consumer Safety) does not assess this ingredient.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
No Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

Microcrystalline Wax is a valuable multifunctional ingredient that enhances product texture and stability while supporting skin hydration through occlusive film formation, offering a low risk of irritation or comedogenicity.

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