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 CP 4000 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 ofspeed, the product
is shear-thinning.

Materiel

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.