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Oxygen gas transmission rate

ASTM D3985, 2002. Standard test method for oxygen gas transmission rate through plastic film and sheeting using a coulometric sensor. [Pg.362]

NBS s involvment in SRM s for gas transmission studies arose out of activities within ASTM Committees D-20 (Plastics) and F-2 (Flexible Barrier Materials) that were aimed at standardizing a new instrumental method employing a coulometric oxygen detector for the measurement of oxygen gas transmission rates in materials used for various kinds of packaging (4 ). A subsequent reevaluation of the precision data for the classical manometric and volumetric methods (5) for gas transmission measurements showed that there are serious problems with the reproducibility and repeatability these methods. The use of SRM 1470 to verify the calibration is currently being written into ASTM standards D-3985 and D-1434. [Pg.81]

ASTM Standard D-3985, "Standard Test Method for Oxygen Gas Transmission Rate through Plastic Film and Sheeting Using a Coulometric Sensor" in Part 35 of Annual Book of ASTM Standards, American Society for Testing and Materials, Philadelphia, Revised Annually. [Pg.91]

Permeability of Thermoplastic Containers to Packaged Reagents or Proprietary Products Oxygen Gas Transmission Rate Through Plastic Film and Sheet using a Coulometric Sensor Water Permeability of Geotextiles by Permittivity Permeability of Leather to Water Vapor... [Pg.155]

F1927-98el Determination of Oxygen Gas Transmission Rate, Permeability and Permeance at Controlled Relative Flumidity... [Pg.155]

Standard Reference Material 1470 is a 23 micrometer thick polyester film whose gas transmission characteristics with respect to helium, carbon dioxide, oxygen, and nitrogen have been carefully measured. A completely computerized manometric permeation measuring facility developed at NBS was used for the measurements. The steps taken to characterize the gas transmission rate of this material over the range of pressures from 67.5 kPa to 135 kPa and over the range of temperatures from 18 °C to 31 °C are described. The results obtained in these measurements are compared with those in the literature. The role of Standard Reference Material 1470 in improving the repeatability and reproducibility of gas transmission measurements employing other instrumentation is discussed. [Pg.80]

Organic polymers as such cannot serve the necessary low oxygen transntission rates to ensure an acceptable lifetime. However, special techniques of deposition can reduce the gas transmission rates. [Pg.378]

Micro-perforation has been commercially practiced to introduce high oxygen breathability to film structures for breathable packages. However, the breathable packages with micro-perforation allow egress of moisture to cause the product to dry out. Perforations can also affect the mechanical integrity of the film and potential variability in the gas transmission rate. [Pg.329]

Certain copolymers of this type have been found to have excellent gas barrier properties, with the dry polymer having an oxygen permeability only about 1/lOth that of polyvinylidene chloride. Unsurprisingly, the copolymer has a high moisture absorption and a high moisture vapour transmission rate. Where the material is swollen by water, gas permeability is also higher. [Pg.394]

Gas barrier properties - Metabolix PHA polymers have lower moisture vapour transmission rates than other biodegradable polymers. The oxygen transmission rates for unoriented PHA films are 25-30 cc-mil/(100 in2-day) at 77 °C, 0% relative humidity. [Pg.80]

Platelets need oxygen to survive. The gas flow rate Q through a plastic film of area A and thickness L is given by Eq. (11.5). Table 15.2 gives transmission rates for particular film thickness, for a specific gas pressure. [Pg.452]

Barrier Properties Exact Plastomers create controllable gas-permeable films for modified atmospheres, as well as gas-permeable films and packaging for such items as fresh vegetables, fhiits, flowers, and a growing range of other horticultural products. Users can select carbon dioxide and oxygen transmission rates (OTR) that meet their needs, with low water vapor transmission rates (WVTR) and high levels of clarity and gloss. " ... [Pg.117]

ASTM D3985 Standard test method for determining the steady-state transmission rate of oxygen gas through a plastic film, sheeting, laminates, coextrusions, or plastic-coated paper or fabric. An American Society for Testing of Materials. [Pg.187]

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See also in sourсe #XX -- [ Pg.179 ]



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