Figure 4.

Figure 4. Spencer puncture test results.
Per ASTM D3420. (Probe ......./16-lfl.[14.3-mml diameter).Spencer Puncture is the measure of the ability of a substrate to resist puncture by impact using a bullet-shaped probe. The higher the value, the less likely an object striking the package (from the inside or on the outside) will break through, compromising the package's sterility and/or damaging the medical device.

Clean Peel
Unlike paper, which can release a significant number of particulates when a package is opened, Tyvek is known for its clean peel and low-linting features. Particulate generation tests comparing Tyvek to particulates that could contaminate the medical device or the wound site.

Outstanding water resistance
Tyvek is highly resistant to penetration by water and other liquids. In fact, water in contact with Tyvek does not "wet" its surface, which means that water does not spread but remains as droplets on the surface of Tyvek. Even in the event of accidental laboratory or operating room spills, Tyvek protects the integrity and sterility of packaged medical devices. Unlike medical-grade papers, Tyvek maintains its strength, both wet and dry. Because Tyvek does not get wet by water, it will not absorb water and, therefore, contamination of the product by waterborne organisms is highly unlikely.