BARRIER of M.V.T.R. and O.T.R.
M.V.T.R. (Moisture Vapor Transmission Rate) and O.T.R. (Oxygen transmission rate) are the rate at which water vapour and oxygen permeate through a film at specific conditions. It is measured in units of g/m2/24 hr and cc/m2/24 hr in metric units.
Both OTR and MVTR should always be considered when selecting packaging materials for specific products. For example, some products will become rancid or oxidize in the presence of oxygen. For these types of products, a high barrier packaging film should be selected.