Cotton blends can be used. However, there are cautions when using them. What is the fibre content. Is it 80 poly and 20 cotton. These are thinner and strange to work with.
They also will shrink if too hot an iron is used. Putting them with all cotton is also chancy as the difference in weight of fabric can be irritating to work with.
I would not do it unless you can touch the fabric and know it is the same weight as other fabrics. Not worth the aggrivation.