Rheological testing investigates the elastic, viscous and viscoelastic behavior and properties of materials, under various shear and temperature conditions. Rheology deals with time-dependent material deformation and flow under stress. The vast testing laboratories network of Infinita Lab, USA, offers this test to clients in the USA and Canada.
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Rheology
Rheology deals with time-dependent material deformation and flow under stress. Rheological testing investigates the elastic, viscous and viscoelastic behavior and properties of materials, under various shear and temperature conditions. Rheology tests can be done for a range of materials including liquids, semi-solids, gels, emulsions, suspensions, dispersion, slurries, polymer melts and solids. Rheological properties are used in numerous industrial applications including fluid transportation systems, polymer extrusion and molding, formulation and processing of pharmaceutical and cosmetic products, paints and coatings, rubber, food-processing, liquids and gel packaging, adhesives production and packaging, chemical or bio-reactor design and operation.
Rheometers are used to perform shear tests and torsional tests on materials They can operate by continuous rotation or rotational oscillation modes, to measure viscosities or viscoelastic properties respectively at controlled temperatures. The measured torque, deflection angle and speed of the measuring bob in both modes are correlated with rheological properties such as viscosity, storage modulus G’, loss modulus G’’ and damping factor Tan δ.
Solid specimens are subjected to torsional tests including oscillatory tests to investigate their dynamic-mechanical behavior.
Common Uses of Rheology Tests
Viscosity and gelling characteristics determination at various shear stresses and shear rates for Hydraulic design of non-Newtonian fluid transport
Viscoelastic classification of materials
Characterization of Dispersions, Suspensions, emulsions for process and product design
Paints and coatings characterization for product application and final finish quality
Polymer processing system design
Packaging of gels and materials displaying non-Newtonian flow behavior
Advantages of Rheology Tests
Understanding Rheology is key to effective design and operation of many industrial important systems.
Rheology concepts are valid across the spectrum from solids to liquids, providing a common theoretical framework.
Limitations of Rheology Tests
Difficult to test small quantities of sample in Rheometers
Thorough cleaning of instrument is needed especially when dealing with adhesives
Special materials of construction needed for aggressive materials
ASTM E572 test method covers the analysis of stainless and alloy steels by Wavelength Dispersive X-ray Fluorescence Spectrometry (WDXRF). It provides rapid, multi-element determinations with sufficient accuracy to assure product quality.
The ASTM D2674 is a standard test method for the analysis of sulfochromate etches solution used in the surface preparation of aluminum. The ASTM D2674 standard specifies a method for determining the efficacy of an etchant used to prepare the surface of aluminum alloys for subsequent adhesive bonding.
An immunological method for quantization of Hevea Natural Rubber (HNRL) proteins using rabbit anti-HNRL serum. Rabbits immunized with HNRL proteins react to the majority of the proteins present, and their sera have the capability to detect most if not all the proteins in HNRL.
ASTM G65 measures the resistance of metallic materials to abrasion using the dry sand/rubber wheel apparatus. The quality, durability, and toughness of the sample are determined using this test. Metallic materials are ranked in their resistance to scratching abrasion under a controlled environment.
ASTM E2141 test methods provide accelerated aging and monitoring of the performance of time-dependent electrochromic devices (ECD) integrated in insulating glass units (IGU). This test helps to understand the relative serviceability of electrochromic glazings applied on ECD.
ASTM C724 test method is used in analyzing the quality and ease of maintenance of a ceramic decoration on architectural-type glass. This test method is useful in the acknowledgment of technical standards.
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