1. Non-Toxic: Polyurethane sponges being used by Whirl-Pak® are non-toxic and do not contain biocides. Unlike the
“wet” cellulose manufacturing process, there is no need to include biocides to control microbial growth during the
polymerization process to produce polyurethane sponges.
2. Routinely Used in Medical Devices: Unlike cellulose sponges, polyurethane sponges have a long history of use in
medical products that are in contact with the body (e.g. wound dressing) or inside of the body (e.g. wound drainage)
because of their non-toxic properties and other attributes such as tensile strength.
3. Batch to Batch Consistency: The polyurethane sponges utilized by Whirl-Pak® are manufactured using high purity
raw materials and well-controlled manufacturing processes. Consequently, the chemical and mechanical properties
of the polyurethane sponges are consistent from batch to batch.
4. Strong; High Tensile Strength: These polyurethane sponges are less susceptible to flaking and tearing when
sampling an irregular and abrasive surface. Therefore, rigorous scrubbing of a rough surface can be done with
minimal to no sponge fragmentation.
5. Good Water Absorbency and Retention: The polyurethane sponges that Whirl-Pak® uses release liquid only under
pressure. Consequently, the