The Beahm Balloon Bonder 520-B utilizes the proven split-molding technique as the system protects the heat sensitive catheter balloon during the welding and bonding process by encapsulating the balloon in a pneumatic cavity immediately adjacent to the weld area. The device further enhances protection as the die is retracted during assembly and unloading. The 520-B Balloon Bonder is also ideal for protecting heat-sensitive materials such as electrical components and coils in non-balloon catheters.