1 White Paper on common microfluidic components materials: properties and fabrication Henne van Heeren (enablingMNT), Christina Pecnik (IMTAG), Vania Silverio (INESC MN), Elsa Batista (IPQ), Huabing Yin (UofG), Basak Akselli (TUBITAK), Florestan Ogheard (CETIAT) This White Paper was written as part of activity A3.1.4 from the EMPIR Establishing Metrology Standards in Microfluidic Devices (MFMET) project. The three-year European project commenced on 1 st June 2021 and focused on providing a generic methodology of accurate measurement of a particular quantity in a microfluidic device by utilising standardised methods and reference documents, e.g. VIM & GUM. For more details about this project, please visit www.mfmet.eu