... with 97% 3.water-proof, moisture-proof Activated carbon filter is acknowledge in the industry as a tried and tested ... pull through hole structure as support/carrier Application:Activated Carbon Filter is applied to chemical, pharmaceutical, food, entertainment place, ... permeation rate with 97%, water-proof, moisture-proof, good shape, stable form, non-toxicity.Honeycomb wall thickness: 0.10mm-0 ...