Selecting the best material of construction is a crucial part of the plant design process, the aim being to balance performance and cost to best advantage. For powder processors, choosing a material that eases flow can pay dividends throughout the lifetime of the plant, but there is limited data on which to base this decision. A study by Freeman Technology highlights the role of the FT4 universal powder tester for such investigations and provides some valuable comparative data for a wide range of commercially available materials and finishes.