Classification and typical structure:
Dialysis fluid, blood bag
Ø  PA25/CPP65；  PA15/CPP65
High resistance diaphragm, outer bag
Ø Moisture and gas barrier, used for packaging drugs such as amino acids and fat emulsions
DPET12/PA15/CPP70
Ø Gas blocking but not moisture blocking, used for packaging drugs such as large infusion solutions and sodium bicarbonate that are sensitive to oxygen
SPET12/PA15/CPP70；  PET12/LDPE13/EOE45