Hi Sona,

The answer to you question is that dielectric constant is the measure of how good of an electrical insulator a material is. The lower the number the better the insulating properties of a material. The higher the number the better a material is at conducting electric current. From this spec it looks like you can use standard garden variety FR-4 

Regards,
Scott Kramer
Sales Engineer

ThermalWorks, Inc.
714 Adams Avenue, Suite 209
Huntington Beach, CA. 92648
 
Tel.  +1 (714) 960-5152 x203
  ----- Original Message ----- 
  From: Fineline Circuits, Inc. 
  To: [log in to unmask] 
  Sent: Friday, May 03, 2002 10:04 AM
  Subject: [TN] Dielectric Constants For Core and Prepreg


  Hi

  For a 4 layer pcb with .062 overall thickness, what does it mean when the specifications call out for "Dielectric Constant for core & prepeg (e) 4.3min to 5.3 max.
  Thanks for your help.

  Sona Sitapara
  Fineline Circuits Inc.
  (215) 364-3311
  [log in to unmask]