OTR (oxygen transmission rate)

OTR (oxygen transmission rate) is the steady state rate at which oxygen gas permeates through a film at specified conditions of temperature and relative humidity.

Value are expressed in cc/100 SI /24 hr in US standard units and CC/Sqm/24hr in metric (or SI) units. Standard test conditions are 73F(23C) and 0%RH.

An industry rule -of-thumb is that a material is considered a “high oxygen barrier” if its OTR is less than 1cc/100SI/24hr (15.5cc/sqm/24hr)