There is a endless list of materials that may be cut with water jet cutting machines, It includes but not only below materials:
Metal and steel plates (including Corten)
Composites
Glass (Not Good for Toughened Glass)
Fiberglass
Ceramics
Slabs
Stone
Borosilicate
Concrete
Composites
Wood
Foods
Plastics
Foams
Silicone Sheets
Paper
Castings
Acrylic
