UB-21 is a clear, two-part urethane resin system, which combines good handling characteristics with excellent cured properties. Its low viscosity allows good flowability and air release. The cured elastomer has excellent bond to metals, ceramics, and many plastics used in medical industry such as acrylic, polycarbonate, PVC etc. They also have excellent water resistance and are exceptionally resistant to thermal shock. They can be used as an adhesive or for potting, casting and encapsulating applications.