Parchmentized fibrous support containing parchmentizable synthetic fibers and method of manufacturing the same

A process of making a parchmentized fibrous support comprising the steps of:

• (a) forming a fibrous support comprised of parchmentizable synthetic aramid fibers and parchmentizable synthetic aramid fibrids;
• and
• (b) parchmentizing the parchmentizable synthetic aramid fibers and fibrids of the fibrous support by treating the fibrous support with H2SO4 at a concentration from about 50% to about 100% and at a temperature from about −20° C. to about +50° C. for between about 5 to about 60 seconds sufficient to obtain a parchmentized fibrous support having an increased strength of at least 30% as compared to the strength of the fibrous support formed according to step (a).