Freeman Technology will launch a uniaxial testing solution for its FT4 Powder Rheometer at this year's AAPS Annual Meeting and Exposition, which will be held on 14-18 November 2010 in New Orleans.
The uniaxial tester further extends the FT4's ability to efficiently and reproducibly measure properties that directly correlate with a powder's in-process behaviour.
Uniaxial testing complements existing test methodologies for shear, bulk and dynamic powder measurement.
Freeman Technology has developed a new accessory that, in combination with a well-defined consolidation methodology, produces a homogeneous, uniform powder column for testing.
Measuring the normal stress required to fracture the column directly identifies the unconfined yield strength.
Comparative tests show that the new solution produces data closely comparable to those derived from shear test data, but offers improved repeatability.
Uniaxial testing is not suitable for powders with very low cohesive strength, but is a quick and intuitive method for measuring unconfined yield strength of more cohesive materials.
It complements rotational shear testing, which, in contrast, requires less sample, can be used for less cohesive materials and is essential for measuring wall friction data in support of material of construction choice.
An application note describing this new solution for uniaxial testing can be downloaded from the Freeman Technology website.
