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Rheology of “Baby” and “Adult” Shampoo

Use

Cosmetic products have different rheological behaviours depending on how they were formulated and on their use.

A comparison of two different shampoos, i.e. Baby and Adult as in this example, is characteristic of this.

Method

After quickly warming of 1 ml of sample at 23°C with RM200 CP 4000 PLUS Peltier a flow curve from 0.5 to 200 s-1 is createdfrom the software. The resulting flow curve shows the influence of shear rate on a product’s viscosity.

When the shear stress curve (Tau = f(D)) is a straight line through 0, the product is Newtonian and if the rheological profile is a curve, viscosity decreases under the effect of speed, the product is shear-thinning.

Results

These two samples clearly show that “Baby” shampoo keeps the same viscosity whatever shearing it suffers, while “Adult” shampoo comes out of the bottle with a texture that is 4 times more viscous, becoming more fluid as soon as it is used, up to a viscosity that is 20 times lower than “Baby” shampoo, which will obviously be less requested.