Rheology testing laboratories undertake testing of materials such polymers, liquids, cosmetic and medical materials such as hyaluronic acid gels
Rheology research laboratories test polymeric materials for rheological properties. Rheological characterisation of materials includes polymers, liquids, adhesives and other samples using a wide range of shear and extensional conditions. Intertek rheology labs determine rheology properties for degradation studies, determining molding parameters, materials performance, and other applications.
Understanding the rheological (flow) properties of a polymer helps obtain optimized material properties during the molding process. Rheology testing can determine if materials are processed properly with minimal product degradation. Rheological tests to measure the viscosity of a polymer ranging from single point tests to variable shear-rate tests.
Rheology tests are performed while the polymer is in the melt phase or while the polymer has been dissolved in a solvent for Intrinsic Viscosity and Relative Viscosity. Rheology laboratories are located in Europe and North America, and samples can be shipped to the labs from most locations.
Two major rheological analysis methods are available for the characterisation of creams/pastes and semi-solids, such as Controlled Stress Rheology (Rheometrics SR500) to predict properties such as shelf life/ease of application and stability - sedimentation rate - performed over a variety of test temperatures) and Controlled Strain Rate Rheology (Rheometrics ARES, RDAII).
We also provide Dynamic oscillatory rheology can also be performed which provides much more information on the microscopic structure of viscoelastic materials (such as creams and pastes) as well as further tests to determine the limit of the linear viscoelastic response, dispersion quality and also material thixotropy, elasticity and stiffness values.
Hyaluronic acid (HA) gels are used by dermatologists and cosmetic surgeons as dermal fillers, which when injected into the skin, can ‘lift’ wrinkles and improve facial appearance. The different processes used in their manufacture and formulation yield products with unique physical characteristics that play an important role in predicting their clinical performance and lifetime of benefit perceived by the patient.
Understanding the relationship between the particle size and particle size distribution of crosslinked HA gels with the viscoelastic behaviour of the gels themselves can help manufacturers develop unique property/microstructure relationships that can help clinicians in achieving desired results for a variety of patient needs.
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