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POLYPROPYLENE TEREPHTHALATE.

Valuable CAS - / EMULSION STABILISING, SKIN CONDITIONING

Polypropylene Terephthalate is a synthetic polymer primarily employed in skincare for its stabilizing and conditioning properties. It effectively supports the formation and maintenance of emulsions, while also contributing to the overall integrity and health of the skin.

Summary

Emulsion Stabilising Skin Conditioning

Science

Mechanism of Action

This ingredient functions by creating a stable interface between immiscible liquids, thereby facilitating the formation of emulsions and enhancing product stability over time. Additionally, it provides conditioning benefits, aiding in the preservation of the skin's optimal state and feel.

Research

Clinical Evidence

Insufficient-data confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Commonly dusted
Red flag below
8%

Polypropylene Terephthalate, as part of modified terephthalate polymers, is utilized in forms such as face powders (up to 99.6%) and aerosolized products (up to 8%), indicating its common presence as a fine particulate. While deemed safe in these applications by CIR, general precautions for inhaling fine particles should be considered.

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

This polymer is practically insoluble in water and exhibits stability when exposed to organic solvents like acetone, benzene, toluene, trichloroethane, carbon tetrachloride, and various oils. However, it is not resistant to degradation by water, acids, and alkalis under elevated temperature and steam conditions, nor to ketones, strong acids, or strong alkalis at ambient temperatures.

Conflicts

  • Strong acids
  • Strong alkalis
  • Ketones
  • High temperature and steam (in the presence of water, acids, or alkalis)

Safety

Safety Profile

CIR Status
Safe as used
Max tested
99.6%
Sensitization risk Unknown

The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that modified terephthalate polymers, including Polypropylene Terephthalate, are safe for use in cosmetics under specified conditions. This safety assessment encompassed concentrations up to 8% in aerosolized products and up to 99.6% in face powders for the polymer group. While specific reported usage concentrations for Polypropylene Terephthalate average around 0.5% in finished products, the broader polymer safety profile supports higher levels. The FDA's determination of terephthalate polymers' safety in medical devices also informed this conclusion. A specific caution exists for glitter forms of these polymers, which, due to jagged edges, may cause physical eye irritation.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Unknown
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

Polypropylene Terephthalate is a valuable formulating agent, offering emulsion stability and skin conditioning benefits with a strong safety profile confirmed by CIR.

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