Local hardware stores will have one. Emery cloth is just a stronger structured sandpaper with a different chemical compound to do the sanding/smoothing.
Attach an edge by simply sewing it onto the fabric. Other options: blanket stitch the fabric, then crochet into the stitches. If possible, crochet directly into the fabric if using...
Shade cloth can withstand about 14 pounds of pressure, but be aware, this material is often used for covering objects. Check the brand of the cloth to make sure.
Linen is made from plant fiber, and burning it will turn it to ash with a slight wood odor when burned. Synthetic fibers will melt and form a blob. There...