Ethyl Macadamiate Reduces White Rub-in

The Cause of Rub-in Whitening

A cream may appear smooth and stable in its container yet leave white streaks or a temporary foamy film when applied. Known as the soaping effect, this behaviour stems from interactions between the oil phase, emulsifier system and the shear forces during application: air gets entrained as the emulsion spreads, light scatters and creates visible traces that fade over time.

How Ethyl Macadamiate Works

The ingredient is a natural-origin ester derived from macadamia oil. Characterised by low viscosity and good spreadability, it is added to the oil phase to help the emulsion deform and flow more smoothly during application, reducing the visible traces associated with air entrainment and light scattering. Formulators can refine rub-in performance without replacing the existing emulsifier system or substantially rebuilding the stability structure.

Applications and Assessment Considerations

Potential uses include facial creams, lotions, body-care emulsions and sunscreen products. Uniproma supplies Ethyl Macadamiate alongside comparative rub-in testing, technical documentation, formulation guidance and sample support. Anti-soaping performance must still be evaluated in the finished product, as emulsifier type, oil-phase composition, system viscosity and usage level can all influence results. Comparative testing remains essential when optimising the system.

Implications for B2B Procurement and Brand Teams

For mature formulations where stability, active delivery and compatibility are already established, adding Ethyl Macadamiate offers a low-risk, low-intervention route to improve sensory performance. Procurement teams should request comparative rub-in data for the same system from suppliers and allow for pilot-to-pilot iteration cycles, avoiding the risk that replacing a single additive could trigger cascading stability issues.