The values I have are 6.3 Er for E-glass and 3.6 Er for (Multifunctional) resin. (Can't answer the S-glass question but I'd like to see the answer.) (S-glass is >$$$$$ and available with high temp resin systems. i.e., CE and Poly. It has more favorable CTE values like 9 PPM in X and Y.) Dave ______________________________ Reply Separator _________________________________ Subject: Re: FAB: E-GLASS VS. S-GLASS Author: [log in to unmask] at SMTPLINK-HADCO Date: 2/29/96 10:08 PM Can anyone add to this the Dk for E-glass vs S-Glass? >Can anyone describe the differences in physical properties between E-glass and >S-glass cloth? What resin is typically used with S-glass? > >J. Marsico >AIL Systems, Inc. >[log in to unmask] > > > D. Rooke ([log in to unmask])