1440 Timberwolf Drive
PO Box 964
Holland, OH 43528-0964 USA
Carbon Dioxide - Container
|Sample Type||Required Quantity||Equipment Used|
|Bottles||1||MOCON C IV Permatan test instrument|
This procedure measures the permeation rate of CO2 through a bottle using a Control C IV Permatran test instrument.
For bottle samples, the bottle is either carbonated with dry ice to the appropriate level or carbonated bottles are sent in for test. The samples are placed on the Permatran within a capture vessel. Nitrogen gas is purged through this capture vessel to constantly remove any CO2 that might be permeating through the bottle sidewalls. During a testing cycle, the carrier gas is diverted into a sampling loop and the CO2 level is allowed to accumulate in the loop. As the carrier gas flows through the test loop, it passes an infrared detector which measures the increasing level of CO2 in the loop. This increasing level is plotted using an x-y chart recorder. This information is used to determine the rate of CO2 permeation through the sidewalls over a given time frame.
The instrument is then injected with a known amount of CO2 which causes a deflection on the chart that represents a specific level of CO2. The trace from the samples containers are then extended out until they cross the known reading for cc/ml of CO2. The CO2 level is evaluated until the CO2 permeation rate reaches equilibrium or begins to increase after remaining flat for several readings.
Film samples can be tested for CO2 permeation. Call for additional details.