GB/T 18798.2 - 2018 is for the determination of total ash content of solid-state instant tea. It clearly applies to all kinds of solid-state instant tea products, specifies the sample collection and preparation methods, specifies the required equipment, and specifies the operation process of placing the sample in a high temperature furnace for burning, covering temperature, duration control, etc. At the same time, it specifies the form of result calculation and reporting. The total ash content reflects the mass of solid-state instant tea. This standard provides a unified method for the production and testing of solid-state instant tea, helps to control product quality, and promotes the development of industry standardization.