If powdered formula is made, then spray drying would be required in addition.[108] Retort sterilization is a traditional retort sterilization method that uses 10-15mins treatment at 118 °C.[108] Ultrahigh-temperature (UHT) is a method that uses a brief (2–3 seconds) treatment at 142 °C. Because of the short time used, there is little protein denaturation, but the process still ensures sterility of the final product.[108]