Short shelf life is relative. We have documented the shelf life of SIPAD boards of up to 14 months. We also have many samples that are more than 2 years old, have been stored in less than ideal conditions, (in my breif case, car trunk etc), and they are still very tacky. Also, if for some reason they do dry out, they can be cleaned and re-fluxed. As far as a stacker is concerned, SIPAD boards were used in the Easi line at the Assembly Technology Expo one year, with a stacker system that was very clever. The boards were placed into the stacker paper side down. A suction cup handler picked up the board, placed it on the conveyor where it was carried over a small air knife that blew off the paper, dropping it into a box underneath. The board transported into an inverter where it was flipped, tacky side up now, and sent into the pick and place machine. We have access to this equipment if you are interested. mk --------------------------------------------------------------------------------- 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 e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/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 ---------------------------------------------------------------------------------