The understanding of powder properties and rheology is important to many sectors including food processing, pharmaceutical, mass finishing and most recently metal additive manufacturing. This paper reports on new insight and knowledge acquired of soda-lime based silica glass powder. Acomprehensive series of tests were completed to fully characterize the powder in respect of flowability, particle size and distribution (granulometry), morphology, apparent and tap density, and chemical composition. It is shown that a weighted consideration must be given to each of these properties dependent on the planned application, and powder transfer system. Two different methodologies were employed to evaluate flowability; a traditional technique used to assess the bulk behaviour based on density, and advance techniques using a rheometer instrument to measure bulk, dynamic and shear properties. Powder constituents were identified by x-ray fluorescence (XRF), except for Sulphur trioxide which was assessed by an inert gas diffusion technique.