Found another web site that had dielectric contant info for DS3241 soldermask. It is claimed that it is 4.2 @ 1MHz (similar to FR4) This info came from: http://www.precisioncircuits.com.au/cid/023.html No info on loss tangent, however insulation resistance is 10E10 ohm and dielectric strength is 50kv/mm (not that those will do you much good in determining the loss tangent:) > >Hi: > > Does anyone, offhand, happen to know the dielectric constant and loss >tangent for DSR-3241 soldermask? > >Thanks, > ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu