Richard, Check out the Jedec J-STD-033 ( http://www.jedec.org ). Level 6 parts are listed as requiring a mandatory bake prior to reflow. Moisture barrier bags and humidity indicator cards are listed as optional. My interpretation of this is that while you may want to seal the parts for other reasons, such as maintaining lead solderability, it's not required for moisture sensitivity reasons alone. Regards, Rick Thompson Ventura Electronics Assembly 2665A Park Center Dr. Simi Valley, CA 93065 +1 (805) 584-9858 voice +1 (805) 584-1529 fax [log in to unmask] -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of <Richard Tilbrook> Sent: Friday, October 08, 1999 12:37 AM To: [log in to unmask] Subject: [TN] level 6 moisture sensitive smt components Hi, I am enquiring into the acceptable conditions [ie. temp. and Relative Humidity] for long term storage [ie. 8 to 10 months] of level 6 moisture sensitive smt components. I am aware that moisture sensitive components of levels 2 through 5 require an RH of less than or equal to 20% RH for long term storage, but does this apply to levels 5a and 6, or is a lower RH necessary? I ask as I have no level 5a information to check on, and level 6 information is individual to the component. Thankyou for taking the time to read this, Regards, Richard Tilbrook, Junior Engineer, British Aerospace. ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ############################################################## ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################