Rheological
properties of semisolids are highly important physical parameters in
both technical (manufacturing, filling, storage) and aesthetic terms.
The
evaluation of semisolid emulsion structure and consistency is therefore
essential in order to determine, adjust, and possibly predict the
corresponding product performance. The emulsifier concentration in the
formulation of the cream and the manufacturing temperature are just two
variables that can effect the flow and viscoelastic properties as well
as the resistance to deformation.
WAX/PETROLATUM Waxes
are an important component of many personal care products such as skin
care, baby products, suntan and sunscreen and lubricating agents.
The
measurement of hardness (or firmness) of these waxes has long been an
important assessment to ascertain their contribution to final product
texture. The hardness of waxes (which is affected by their melting
point) may have a significant effect upon other physical properties and a
measurement of hardness is used to determine whether a wax is suitable
for use in products to provide rigidity, good moulding properties, or is
capable of producing soft emollient films with good lustre.
CREAMS, EMOLLIENTS & SHAMPOOS
