* Waterproof, moisture-proof film prevents sample evaporation, contamination and protects anhydrous materials
* Can be folded repeatedly and twisted around sharp surface without rupturing
* Increases approximately 200% when stretched lengthwise at 21° C (70°F)
* Partially returns to original length when tension is removed
* Becomes more flexible and softer as temperature increases
* Rolls are interlined with paper to prevent adhering
