Barrer


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Barrer 

A unit of oxygen permeability of a contact lens material. Symbol: Dk. It is equal to the product of the diffusion coefficient D of oxygen through the material (i.e. the speed at which oxygen molecules pass through the material) and the solubility k of oxygen in the material (i.e. the number of oxygen molecules that can be absorbed in a given volume of material). See oxygen permeability; oxygen trans-missibility.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
It should be pointed out that the CHM exhibits excellent permselectivity at 20[degrees]C, for instance, oxygen permeability coefficient and oxygen/nitrogen separation factor are 594 Barrer and 3.50, respectively.
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35[degrees]C 0.47 [+ or -] 5% 6.9 X [10.sup.-4] [cm.sup.3](STP)/ [+ or -] 5% ([cm.sup.2].d.atm) 65[degrees]C 1.7 [+ or -] 6% 2.5 X [10.sup.-3] [+ or -] 6% Time-lags 35[degrees]C 11 6.6 X [10.sup.3] [+ or -] 2% 65[degrees]C 3.7 [+ or -] 15% 1.3 X [10.sup.3] [+ or -] 2% oPP Col P Barrer 35[degrees]C 2.1 [+ or -] 5% 1.0 X [10.sup.-4] [+ or -]15% 65[degree] C 7.5 [+ or -] 6% 3.8 X [10.sup.-4] [+ or -] 16% D [cm.sup.2]/s 35[degrees]C 1.4 X 2.6 X [10.sup.-7] [10.sup.-13] [+ or -] 22% 65[degrees]C 4.1 X [10.sup.-7] 1.3 X [+ or -] 15% [10.sup.-12] [+ or -] 22% S [cm.sup.3](STP)/ 35 [degree]C 0.12 [+ or -] 5% 3.1 [+ or -] 37% ([cm.sup.3].atm) 65[degrees]C 0.14 [+ or -] 2.2 [+ or -] 38% 21% 65[degrees]C 4.1 X [10.sup.-7] 1.3 X [+ or -] 15% [10.sup.-12] [+ or -] 22% [N.sub.2] oPP oPPl-Col T.R.
Although Q and SC compression-molded sheets followed the expected trend, with permeability decreasing from 1.12 Barrer for Q sheet to 1.00 Barrer for SC sheet, the permeability of VSC sheet of 1.03 Barrer was slightly higher than that of the lower crystallinity SC sheet.
Signing undisputed world middleweight champion Bernard Hopkins and Mexican great Marco Antonio Barrer a shows he means business.
Harrison's manager is already in negotiations with the WBC superfeatherweight champion Barrer a about the possibility of a May battle.