This article outlines the key advantages, applications, and production role of high-performance PET preform moulds. Key benefits include cost-saving interchangeable parts, a double-cone clamping design that prevents defects like flash, and the use of durable S136 steel capable of over 5 million cycles. These molds are essential for mass-producing containers like mineral water and carbonated drink bottles, supporting configurations of up to 128 cavities for maximum efficiency. In production, the mold ensures quality stability through a hot runner system and precise water-cooling, with all designs backed by rigorous testing and readily available spare parts for minimal downtime.