PET metalized film — why the “aluminum layer” number on the spec sheet can be misleading
PET metalized film — why the “aluminum layer” number on the spec sheet can be misleading PET metalized film gets its reflective, barrier boosting properties from a thin layer of vacuum deposited aluminum, but buyers often assume a thicker aluminum layer always means better barrier performance, which isn’t quite accurate. Beyond a certain point, adding more aluminum thickness gives diminishing returns on oxygen and moisture barrier improvement while making the film more prone to micro cracking during flexing or lamination, which can actually weaken barrier performance in practice. What matters more than raw aluminum thickness is optical density, a measurement that reflects how uniformly and completely the aluminum layer covers the film surface, and suppliers who can provide optical density test data tend to have tighter process control than those who only quote a general aluminum thickness figure. #PET_metalized_film #Aluminum_coated_PET_film #Metalized_PET_film #PET_film #PET_film_manufacturer #PET_film_supplier #PET_film_China #Optical_density_film #Barrier_film #BOPET_metalized_film
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