PVC, or polyvinyl chloride, is a widely used engineering plastic that comes in two forms: unplasticized and plasticized. Unplasticized PVC is utilized for rigid products such as pipes and fittings and is the form used for CNC machining. On the other hand, plasticized PVC is employed in flexible items like cables and small tubes. PVC is known for its eco-friendliness, as it uses fewer non-renewable resources in production compared to other plastics.