Back in the 60's for a home ec project I used what I think was a poly/cotton blend as sashing on quilt squares (made by my mom and her sister for their hope chests) of 30's muslin crayoned and embroidered in the state flowers pattern. The 30's muslin started deteriorating by the early 90's, but we still got 30 years of constant use out of that quilt!
Use those poly/cotton blends...they will do wonderfully well in a quilt.