All of these wipers are laundered and packaged in a Class 10 clean room laundry. Polynit HS (PNHS): The Polynit is converted in a proprietary process which bonds the fibers at the edges of the wiper. This edge is not as strong as other sealed edges; however, it is very clean. In addition, this converting process has the flexibility to make wipes of any size and shape. Class 1-10 Polynit Hemmed (PN): 100% textured polyester no-run interlock knit wiper. Low in both particles and extractables . Good sorbency with solvents. Offered below with a hemmed edge, which is one of the most effective ways to seal the edge of a wiper. Class 100 Genesis (GS): A different proprietary process is used to seal the edges of Genesis, a lightweight woven wiper, resulting in a strong smooth edge which does not detract from performance. Class 100