- Rotational Viscometers
- Kinematic Viscometers
- Viscometer Accessories
VISCOSITY is a measure of the resistance of a fluid to flow. This resistance arises from the attractive forces between the molecules of the fluid. A fluid will only flow if enough energy is supplied to overcome these forces.
For a body to be able to move through a fluid, the fluid has to flow around or across it.
Therefore, the energy required to move a body through a fluid is directly related to the degree to which that fluid resists flow, i.e. its viscosity.
In scientific use, viscosity is the tendency of a liquid or gas to resist, by internal friction, the relative motion of its molecules and hence any change of shape; the magnitude of this, as measured by the force per unit, area resisting a flow in which parallel layers unit distance apart have unit speed relative to one another, also called absolute or dynamic viscosity; kinematic viscosity is the dynamic viscosity divided by the density of the fluid.
There are many reasons for making rheology measurements. Often, the objectives of rheology testing or viscosity testing are to identify and quantify rheological properties that correlate to consumer perceived product attributes.
These attributes can include:
- How does it look in its container on the store shelf?
- How easily does the product dispense (squeeze, pump or spray) from the container?
- Does the lotion easily spread on the face, hands or nails?
- How does it apply to a hard or soft surface, and remain on the surface?
One of the objectives of Rheology Central is to quantify consumer perception of product attributes that are rheology driven. We complete comprehensive rheology studies of consumer properties specifically for correlation to consumer sensory studies.
Are your products pseudoplastic, viscoelastic?
Do they exhibit time dependent shear effects such as thixotropy or rheopexy?
Many products are non-Newtonian pseudoplastic fluids. Emulsions and other complex dispersions are frequently viscoelastic.
What can the strain sweeps and frequency sweeps tell us about your product? And how does this relate to consumer product perceptions and preferences?
Fungilab is the key company to give you all of the answers in Viscosity filed.