Abstract: A splint product is used for forming a hard structure about a body portion. The product includes a substrate impregnated with a resin that hardens when exposed to water. A protective water-impervious envelope surrounds the substrate and shields the substrate from exposure to moisture in the atmosphere. An outer cushioning wrap surrounds the protective envelope and is for engaging the body portion. Prior to wetting of the splint product, the protective envelope is removed from its shielding position about the substrate so that the substrate remains inside the outer wrap. The outer wrap with the substrate therein is exposed to water and applied to an appropriate body portion about which it hardens.

Abstract: A polyvinyl acetal sponge formed from a high molecular weight polyvinyl alcohol is used for forming a splint for a portion of body, such as during healing of a bone fracture or other injury. The sponge is maintained in a softened condition in the presence of vapors of a softening agent such as ethyl alcohol within a sealed pouch. Upon removal from the pouch, the sponge is applied to the body portion and it hardens to form the splint as the softening agent vapors dissipate.

Abstract: A casting blank for forming orthopedic casts is provided with two layers of plaster splints having different setting rates or times. The plaster splint layer disposed on a lower sheet of the casting blank sets more slowly than the layer disposed on an upper sheet of the blank. The quicker setting upper plaster splint layer rapidly immobilizes the injured body part, while the slower setting lower splint layer results in greater final cure strength and insulates the body part from the heat generated by the upper layer to prevent burning of the skin surface. The slower setting lower splint layer adapts more completely to the contours of the body portion to increase patient comfort.