Cosmetic tube classification At the hierarchical level, cosmetic tubes are divided into single-layer, double-layer, and five-layer tubes, which are different in terms of pressure-proof, anti-permeation, and feel. For example, the five-layer tube consists of an outer layer, an inner layer, and two adhesive layers. Another barrier layer. Double-layer tube is more commonly used. In terms of calibre, cosmetic tube caliber is 13#-60# variety of calibers. When a certain caliber tube is selected, different capacity features are marked with different lengths. The capacity is 3ml-360ml. Below 60ml, the diameter below 35#, 100ml, 150ml is usually used with 35#-45# caliber, and for above 150ml, the diameter above 45# is required. In the production process, round tubes, oval tubes, flat tubes, and ultra-flat tubes are more common. Flat tubes and super flat tubes are new types of tubes that have been produced in recent years and are more complex than other tube technologies, and therefore have c...