Formulating Fundamentals!

You can find quick summaries of these terms in the new glossary!

And don’t forget to check out the chemistry section as we add more information to it all the time!


Defining some scientific terms: Solubility, viscosity, surface tension, and interfaces

Defining some scientific terms: Contact angle, wetting, refractive index, and specific gravity

Defining some cosmetic chemistry terms: Spreadability, play time, cushion, drag, and melt point

Why is the cosmetic formulator concerned with solubility, viscosity, surface tension, contact angles, wetting, refractive index, specific gravity, spreadability, play time, cushion, drag, and melting point?

Considering the effect of different combinations of oils & butters in a basic lotion

Experiments in the workshop: Emulsified sugar scrub variations – modifying the emulsifier

Experiments in the workshop: Emulsified sugar scrub variations – modifying the fatty alcohol



Q&A: Xanthan gum, pilling, and alternatives? Some information on sclerotium gum

Chemistry: Rheology modifiers – Introduction and defining some terms: Yield stress and shear

Chemistry: Rheology modifiers – Newtonian and non-Newtonian fluids

Chemistry: Rheology modifiers – categories and defining a few more terms



Chemistry: Atoms, moles, and molecular weight



In part one, we looked at substituting one oil or butter for another oil or butter in a lotion.

In part two, we altered the viscosity by altering the oil phase.

In part three, we took a look at how your choice of emulsifier alters the properties of a lotion, and made lotions with emulsifying wax NF, Polawax, and Natragem EW.

In part four, made lotions with three other emulsifiers – Simulsol/Lotionpro™ 165, Incroquat BTMS-50, and Ritamulse SCG. (Find these emulsifiers and more in the Emulsifiers & solubilizers section of the blog!)