Dependence of the oxygen barrier of coated bottles on gas flow rate. OTR refers to oxygen transmission rate. The unit of OTR, cc(STP)/day/bottle, refers to cubic centimeter at standard temperature and pressure per day per bottle. Gas flow rate of vinyl silane was arranged between 30 and 90 sccm, and the resultant OTR of coated bottles was measured. The value of OTR at the gas flow rate of 0 sccm shows the OTR of uncoated bottles.