Before further processing, all units undergo multi-stage ultrasonic cleaning to remove oil and metal particles, ensuring strong coating adhesion and long-term food safety. The cups are then hermetically sealed and placed in high temperature vacuum furnaces, delivering 24-hour heat retention and 72-hour cold retention. For surface finishing, we offer food grade powder coating, matte/glossy finishes, hydro-dipping, and UV printing. All coatings are durable, scratch-resistant, and dishwasher safe. Your brand identity is applied via laser engraving, silk screen printing, heat transfer, or UV printing, with rigorous alignment and color accuracy checks. Quality control is embedded at every stage, incoming material verification, in-process welding and coating inspection, batch vacuum performance testing, and 100% full unit final inspection before shipment. Partner with Locust for reliable, FDA and LFGB compliant custom drinkware.