The model meaning of corrugated structured packing is mainly expressed by the combination of numbers and letters to indicate its structural parameters and performance characteristics. The specific rules are as follows:

Numerical part: represents the specific surface area of the packing (unit: m²/m³), for example, 400X indicates a specific surface area of 400m²/m³12. The model range of ceramic corrugated packing is wider, such as 100XY~7500XY, the number corresponds to different size specifications 3.
Letter section:
Type X: The vertical Angle of the ripple is 30° and the pressure drop is small, which is suitable for scenarios that are sensitive to pressure drop.
Y-type: Corrugated Angle of 45°, better mass transfer performance, suitable for efficient separation conditions 123.
Other notes:
In the national standard, X and Y are sometimes expressed by Ⅰ and Ⅱ, respectively, but X/Y is still the mainstream identifier in practical applications.
The model naming rules for different materials (such as metal, ceramic) are the same, but the performance parameters (such as bulk density, voidage) will be adjusted for material differences 134.
For example, the model 500Y corrugated metal orifice packing has a specific surface area of 500m²/m³ and a corrugated Angle of 45°, which has good mass transfer efficiency and flux4.