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SN’s post actually left the polyester or polypropylene question open-ended. For whatever reason Medtronic puts the word polyester in to the name of at least one of their Progrip products on their web site but leaves the other undefined.
The Medtronic Youtube page is more specific. They are using the self-fixation material, aka Progrip, on both polypropylene and polyester mesh substrates. Unless somebody made a mistake in their video production.
My background contains some materials science so these types of questions interest me. For the record, there are many variations within the classifications of polypropylene and polyester. The word “polyester” is especially undefined. Even the polylactic acid polymer is, literally, a “polyester”. A polymer of ester bonds. The manufacturing process used to make the fibers also has a significant impact on properties.
The medical device makers know all of this. But the tradenames allow them to market the product more effectively.