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2 liter bottle launcher safety

What is the maximum pressure you allow your students to use when using
compressed air to launch a 2 liter bottle? What maximum compressed air
pressure can one of these bottles take? Our launcher is homemade, should we
expect the O-ring seal to limit the maximum pressure? If the bottle were to
explode will it just split open or will flying fragments be produced? Any
warnings, recommendations, and/or precautions would be greatly appreciated.