The primary difference between these water based polyurethane resins is the balance of hardness vs. flexibility. The UD-220 and UD-250 are harder and more suited for substrates such as wood and rigid plastics whereas the UD-211 and UD-270 are more suited for flexible substrates such as flexible plastic film.
The UD-263 in particular is an excellent compromise between hardness, abrasion resistance, and flexibility making an excellent choice for flexible topcoat applications for substrates such as leather, bonded leather, and PVC.
These products are uncompounded water based polyurethane resins which may be suitable for some applications as supplied. However, they may require the addition of additives such as wetting agents, defoamers, thickeners, and or other additives to optimize them for your specific application. We would be happy to work with you to help customize these water based polyurethane resins for your requirements.