Hi Don! A weight gain test is very "tricky" test to accurately use for any purpose. I have done a number of internal investigations concerning component moisture uptake and cleaning processes using weight gain as my response measurement. You need a very accurate balance (X.XXX) with enough range to weigh your item of concern, any handling residues (such as hand oils) can invalidate weight measurements, and the transfer/dwell time for the weight measurement can negatively or positively influence you data set. I would recommend exploring other possible test methods rather than use a weight gain method - too many external influences which can impact your data set. Good Luck. Dave Hillman Rockwell Collins [log in to unmask] "Steffen, Don E" <[log in to unmask]>@IPC.ORG> on 05/29/2001 07:58:19 AM Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond to "Steffen, Don E" <[log in to unmask]> Sent by: TechNet <[log in to unmask]> To: [log in to unmask] cc: Subject: [TN] Weight Gain Testing Technetters Is there anyone out there in the TechNo world that has performed a Weight Gain Test. I am deriving a Board Cleaning Spec and the amount of moisture gain in the printed wiring boards is an attribute that I want to track in order to minimizing the chances of "Popcorning" internal the PWB. I do not want any delamination to occur since we are processing material in multilayer. Any help you can give me would be appreciated. Donn E Steffen Senior Quality Engineer VDO Control Systems Ph# 219-920-6052 Fax# 219-925-8710 Cell# 219-417-2926 Pager# 219-430-2826 ----------------------------------------------------------- This Mail has been checked for Viruses Attention: Encrypted Mails can NOT be checked ! *** Diese Mail wurde auf Viren ueberprueft Hinweis: Verschluesselte Mails koennen NICHT geprueft werden! ------------------------------------------------------------ --------------------------------------------------------------------------------- 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 To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL 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 ---------------------------------------------------------------------------------