Fixed the above fixed links.
http://www.crownproductsinc.com/oringchart.htm
http://www.crownproductsinc.com/oringmaterials.htm
Also newer versions of those pages can be seen here:
Crown Products, Inc. .:. Filters, Gaskets, O-Rings, Seals
and here
Crown Products, Inc. .:. Filters, Gaskets...