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C9-15 ALKYL PHOSPHATE.

Valuable CAS 190454-07-0 / CLEANSING, SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

A sophisticated anionic surfactant and emulsifying agent that bridges the gap between oil and water phases to create stable, elegant formulations. Unlike traditional harsh cleansers, it provides a specialized phosphate ester structure that delivers a rich, lubricious lather and a silky, non-greasy finish on the skin.

surfactant emulsifier cleansing agent texture enhancer

Science

This molecule functions through a dual-polarity structure, featuring a lipophilic alkyl chain and a hydrophilic phosphate head. By reducing the interfacial tension between incompatible phases, it enables the formation of stable emulsions while providing a dense foam profile that cleanses without the protein-denaturing aggression associated with common sulfates.


Research

High confidence
Effective range 0.12–8.3%
Optimal

5%

Key findings

  1. 01 Safety assessments by the CIR Expert Panel (2014) confirm that alkyl phosphates are non-sensitizing and non-irritating in human patch tests at concentrations up to 5%.
  2. 02 Toxicological reviews found no evidence of reproductive or developmental toxicity, supporting its profile as a stable and safe functional ingredient.

Transparency

Not commonly dusted
Min. effective
0.12%
Red flag below
0.05%

As a structural emulsifier and surfactant, it is typically used at functional levels (above 0.1%) to maintain formula integrity. It is rarely 'dusted' because its omission or reduction below functional thresholds would immediately compromise the product's physical stability.


The Formula

Solubility
Both
Optimal pH 6.3 – 8
0 7 14

Stability

While chemically stable across a broad pH spectrum (3-12), its ability to thicken and stabilize emulsions is most precise between pH 6.3 and 8.0. It can be processed cold or heated to 70-80°C for enhanced oil-phase integration.

Synergies

  • oil-based emollients
  • non-ionic surfactants
  • fatty alcohols

Conflicts

  • high electrolyte concentrations
  • temperatures exceeding 80°C
  • strong oxidizing agents

Safety

CIR Status
Safe as used
Max tested
8.3%
Pregnancy
Safe
Sensitization risk Low

Safe for long-term use in both leave-on and rinse-off applications when formulated to maintain the skin's physiological balance.


Your Skin

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

Our Assessment

Valuable

A high-performance, skin-friendly alternative to sulfates that offers superior textural elegance and reliable emulsion stability for sensitive skin formulations.


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