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.
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
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.