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Lanphos TEP4K

Product Category: Anionics

Phenol + 4EO Phosphate Ester - Potassium Salt

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A very effective hydrotrope for low to medium alkaline formulations, and will help to solubilise conventional surfactants in these conditions. In high alkaline systems micelles are formed and surface activity becomes more enhanced.

Key Properties:

  • Does not change the foaming, wetting of other surfactants in formulations

  • Hydrotrope to improve the solubility of nonionic and anionic surfactants

  • High Acid, Alkali and Electrolyte stability

  • Compatible with high levels of inorganic builders such as sodium potassium hydroxide, silicates, phosphates and polyphosphates

  • Becomes surface active in highly alkali formulations: See Blog



  • Household general purpose cleaner

  • Industrial and institutional cleaning

  • Carpet cleaner

  • Powerful hydrotrope

  • Metal cleaning

Lanphos TEP4K isn't surface active at low alkaline levels as its unable to form micelles. This can be shown by the wetting profile below:

Wetting draves 0.5g/​l


However, as you increase the pH then the product becomes more surface active and temperature increases can also enhance the surface activity.

More details view the blog:  A Surfactant for highly alkaline formulations


Appearance at 25°C

Clear pale straw liquid from foreign matter

Solids content %

64.0 - 66.0

pH (1% aqueous)

7.0 - 7.4

Typical Properties


Aryl ether phosphate (potassium salt)

Viscosity at 25°C (cP)


Pour point °C


CAS number 


Specific gravity at 20°C


Flash point closed cup °C




Solubility in water


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