CO2 Retention: Zahm & Nagel Method
| Sample Type | Required Quantity | Equipment Used |
| Bottles | 120 |
Zahm/Nagle device |
Purpose
This procedure determines the CO2 shelf life of a given
carbonated beverage container by evaluating the CO2 level
within sample bottles over time using a Zahm & Nagel test device.
Description
One hundred and twenty bottles are carbonated to 4.2° ± 0.1 volumes
CO2 and then stored in a constant temperature chamber at
72°F, 50% RH for the duration of the test procedure. Twelve bottle
samples are destructively evaluated using the Zahm & Nagel device
for internal pressure and temperature at the following intervals: 0 hrs,
24 hrs, 2, 4, 6, 9, 12, 16, 20 and 24 weeks. The internal pressure and
temperature are then correlated to the CO2 volumes contained
within the bottle and the average % CO2 loss per week is determined.
This test measures the CO2 loss from the entire package
(bottle and closure) not just the bottle alone.
Video Demonstration
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