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Foam Dressings
Porous hydrocellular polyurethane material draws wound fluid inside open cells. Wound fluid held within the capillaries is same liquid state as in the wound bed.
Superabsorbent Polymers (SAP) Dressings
When excess wound exudate encounters the SAP layer, the SAP particles bind to the fluid and chemically change the fluid into a gel. This gel is now locked and retained within the dressing, even under compression.