It is called HTV, not HTPU. But you are technically right. But I was using the common vernacular just because it is the common vernacular. Standard inkjet inks still don't stick or dry well to PU.
The first link to Color Print: "ColorPrint Easy is the easiest weeding print and cut material ever! Compatible with eco-solvent and solvent based printers/cutters" Not standard inks.
The second link to brilliant vinyl: "A heat press is highly recommended for applying this inkjet transfer paper due to temperature and pressure requirements. " Says it is a paper, not vinyl or PU since we are getting technical.
The third link is more Color Print, sames as first.
Forth link: First customer review I saw: "This product flaked off of the printed sheet. Please note several issues:1) The description says it is for inkjet printers. I used a regular inkjet printer. There are special inkjet printers that use Oil-Based & Eco-Solvent Ink. If this is a product for these special printers than it should have said so. I'm also going to report that this product is mislabeled. Is it vinyl or paper? It is listed in the Transfer Paper category. At the time of this review the description clearly says it is "Vinyl". This product didn't say it was for sublimation printing therefore I assumed, and rightfully so, that it was for a regular inkjet printer.2) The product came with two different labels attached to the plastic protective bag, which were "A4 Dark Transfer Paper" and the other says "Printable Heat Transfer Vin(yl). Which product is it?3) This product came with no cardboard insert to keep it from being bent, which it was. I returned this with a cardboard insert. This mailing issue should be on Amazon as it says that it is Fulfilled by Amazon." Seems like a scam.