The Column's Product of the Day: orthopedic casts

Via the always excellent The Column, orthopedic casts: 

“The material casts are made of is a knitted fiber soaked with a polyisocyanate prepolymer. The fiber is typically fiberglass (long strands of glass surrounded by a polymer) or a polyester like PET. The polyisocyanate prepolymer is a usually a polyether polyol (like this polypropylene glycol from Covestro) with MDI end caps. When this stuff hits water it cures (forms crosslinks) and become the rigid polyurethane that protects your (or someone else's) healing bones.“

Enjoy!