this type of fabric are taxed @ 5% or 12% flat....they are not subject to their sale value......it is on garments/apparel where the type of rate you are talking are applied......to know rate of different fabrics you go to following website
cbec-gst.gov.in
in this website on the main menu you will find GST Rates....click on it.....here you can find GST Rates by searching their name...