It is definately recommended that once the paste is brought to room temperature after refrigeration and a portion is removed, you may put the remaining portion back into the refrigerator with several requirements: A)That the relative humidity of the environment was relatively low (<40%) - this will ensure that no condensation or minimal condensation will occor in the jar; and B) that the seal on the jar is complete, make sure the lip of the jar is clean and tighten the lid down as hand tight as possible. AIM Products manufactures a past which can remain unrefrigerated for 6 months in ambient conditions; I know of many small manufacturers who use this paste for that reason; it is a very stable formulation and lends itself to small batch processing. Feel free to browse their website at www.aimsolder.com Kevin Hogan Midwest Tech Services. ======================================== From: To: MS Outlook::[log in to unmask] Subject: [TN] Solder paste refrigerated after the container is opened. Date: 2/23/00 3:28 PM Hi Techneters, This questions is mostly geared towards the small manufacturers that does not use that much paste, but all comments are welcomed. Most manufactures recommend you store your paste in a refrigerator and keep the temperature at 32-50°F. We do this, but since we do not use that much paste, we will open a jar and apply the required amount of paste on our stencil. Our biggest production amount only requires us to apply paste to our stencil maybe twice or three times a day. I was told by an outside source that once we open the jar of paste we can not put it back in the refrigerator. One reason they said was we are exposing the paste to the air and once this happens you need to use the paste ASAP. That's a problem for us since we do not use that much to begin with. Currently, we will open the jar and take what we need and then put the jar back into the refrigerator, it may be two days before we need to use the paste again. How do the small shops handle their paste? Thanks in advance, Jim West ############################################################## 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 ##############################################################