How to measure the angle of repose of hazardous substances in the test centres for dangerous goods packagings

The flow properties of powdery or granular filling substances for dangerous goods packagings are safety-relevant parameters. To specify the behaviour, angle repose is measured in recognized test centres Germany. Previous investigations performed on non-hazardous revealed that some methods currently used have disadvantages application. Additionally, occupational health and safety reasons, it was generally viewed critically to carry out measurements at all. Instead, dimensionless Hausner ratio describe behaviour proposed. In this work, were extended real hazardous concretize assessment. Five exemplary tested their using commonly applied centres. also determined. addition, influence a different climatic preconditioning measurement examined three selected bulk materials. results show not fundamentally excluded goods. However, reasons applicability, repeatability safety, only ISO method can be substances. This provides conservative regarding safety-related evaluation transport principle, both determination It essential especially with finely powdered goods, controlled preconditioning.