Microplastic analysis is a very time-consuming procedure while smaller-sized plastics (<300 microns) can mostly not be detected with the methodology applied such as FTIR. To speed up the data analysis and detect microplastics down to a size of 20 microns we aim with this project to provide an open-science laboratory protocol suited for high throughput microplastic analysis with a Laser Directed Infrared Imaging system (LDIR).