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Examples of moisture vapor transmission rates (MVTR) for commonly used bottle types for probiotic dietary supplement products (from the Alpha Packaging Plastics Comparison Chart (http://www.alphap.com/bottle-basics/plastics-comparison-chart.php)).
| Material | MVTR (g*mil/100 in2/24 h) |
|---|---|
| PET (Oriented or Stretch-Blown Polyethylene Terephthalate) | 2.0 |
| HDPE (High-Density Polyethylene) | 0.5 |
| Glass | near 0 |
