Since real parchment is animal skin, the name "parchment" when applied to paper speaks only to the look and feel, not the quality and strength. I would suggest you stick to paper that is at least 50% rag, not sulphite pulp. Paper made for any of the traditional printmaking processes- etching, engraving, etc. or for watercolor work will hold up well. The finish of the paper (plate, cold press, hot press, laid, rough, etc.) the color and the weight will dictate how it performs for your process, and there are many, many variations there. Try Dick Blick or Daniel Smith for a good selection.