FlowVPE Flow Fibrettes are designed to work with the FlowVPE variable pathlength system. Flow Fibrettes come in two sizes, 3 mm and 10 mm, and must be matched with the same size Flow Cell. The 3 mm Flow Cell is most frequently used for laboratory work. The 10 mm Flow Cell can be used for higher volumes and more moderately scaled (pilot) process installations. The 10 mm Flow Cell can also be used with the FlowVPE Vessel Holder Accessory to make measurements in the standard SoloVPE large silica vessel.