Hello Shirley, As far as I know, 7628 (R/C:43%) is never allow between copper foil and laminate. For mobile phone key board, I had encountered one case that customer require 0.010" thin core with 1.0mm final thickness. Then I have to use 7630 (R/C:49%) prepreg to hit customer requirements. But the unfavorable things of using 7630 is thickness after lamination is difficult to control with the tight final thickness tolerance. But we have reach customer requirement at last. Hope this help! Benjamin Wednesday, November 29, 2000, 7:20:04 PM, you wrote: SX> My friend pass me another question. I hope someone SX> can give some inputs. SX> The application is a mobile phone keypad (gold SX> plated), Motorola's engineer insists that it is not SX> acceptable if we can see the patten of glass fabric. SX> The microsection shows there is no weave exposure or SX> weave texture(use 0.014" H/H laminate,construction is SX> 2 ply of 7628) SX> 1. Is it true that the circuit board surface is more SX> rough if we use 7628? SX> 2. What can do to improve the surface quality? Use SX> 2116 instead of 7628 or modify the resin content of SX> 7628 prepreg? SX> 3. Is there any related specification? SX> Thanks in advance! SX> Shirley SX> __________________________________________________ SX> Do You Yahoo!? SX> Yahoo! Shopping - Thousands of Stores. Millions of Products. SX> http://shopping.yahoo.com/ -- Best regards, Benjamin mailto:[log in to unmask] --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------