silver foam ag sterile highly absorbent antibacterial dressing w/o pu backing, 4"x 4", 5 dressings/box, medheal by medvancetm medvance medvancetm medheal silver foam ag sterile highly absorbent antibacterial dressing w/o pu backing, 4"x4",5 dressings/box. medvancetm medheal silver foam dressing is a non-adherent and antimicrobial foam dressing. the impermeable polyurethane film layer acts liquid and bacteria barrier to prevent external contamination, while allows the vapor and oxygen transfer to create a moist wound healing environment. the reticulate structure of the foam absorbs the wound fluid upon contact to avoid wound maceration. the non-adherent foam allows the atraumatic dressing removal to deliver optimal patient outcome. the in-vitro test showed the incorporated silver provides broad spectrum antimicrobial activity against most common clinic pathogens associated with wound infections for up to 7 days, staphylococcus aureus, streptococcus pyogenes, enterococcus faecalis, escherlchia coli, klesiella pneumonlae, and pseudomonas aeruginosa. medvancetm medheal silver foam dressing is available with and without border.