When it comes to laser safety, knowing what materials not to cut is just as important as knowing what you can. In this episode, we’ll walk through how to use CAS numbers and Safety Data Sheets (SDS) to uncover the hidden dangers inside common materials like PVC and ABS. You’ll learn where to find CAS numbers, how to search for SDSs, and which sections actually matter for laser users. We’ll also break down why SDSs aren’t perfect, how to cross-check with trusted scientific sources, and the red-flag decomposition products that should keep certain plastics far away from your laser.