Beyond the shelf life of the MBB, the shelf life of the component must also be considered. While the capacitors themselves are quite robust under the given storage conditions listed here, solderability can be degraded with exposure to high temperature, high humidity, corrosive atmospheres, and long-term storage. For optimal solderability, components should be mounted within 4.5 years of the three-digit print week code (PWC) found on the face of the component.