what is the differences for Cosmetic plastic tubes between 2 layers or 5 layers ?

The compound of platic tubes choice 2 layer plastic packaging tube

It is very convenient to use, soft-touch ,good scalability and impact resistance.

However, as a disadvantage of as bad gas barrier, the dissolved aromatic compounds are easy to be oxidized.

So It is applied to on cosmetic packaging for facial cleansing cream, hand cream, facial mask ,  body lotion shower gel , shampoo  and so on .

The structure of platic tubes choice  5  layers plastic packaging tube

5 layers tube ( Multi-layer cosmetic tubes/EVOH tubes/CO-EX tubes )has the stronger isolation , it is good for the sunscreen products , foundation, medicines or some cosmetic which has the special ingredients , alcohol and special odour and fragrance