Permeability: CO₂ Container (MOCON)

Purpose
This procedure measures the permeation rate of CO₂ through a bottle using a Control C IV Permatran test instrument.

Description
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.

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