Any other RF substrate like taconics, etc. that we can use to fill copper inton via hole? June 27, 2020 By Wellerpcb Team 1312 views Sorry taconics material is not OK as it is a soft feature material which can be randomly “expanded” by filled copper. Likes (1) CONTACT US NOW Attachment: ( a .zip or .rar file, max 25MB ) We’ll do our best to get back to you ASAP. Please enable JavaScript for this form to work.