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Hello mary1,
Welcome to the DigiKey TechForum.
The information we have, that’s in the Datasheet is the following:
Refrigeration is the recommended optimum storage condition for solder paste to maintain consistent viscosity, reflow characteristics and overall performance. NXG1 should be stabilized at room temperature prior to printing. NXG1 should be kept at standard refrigeration conditions, 0 to 10°C (32 to 50°F). Shelf life is 8 months from the date of manufacture when handled properly when hadl at 0 to 10°C (32 to 50°F).
They also have: Please contact Kester if you require additional advice regarding storage and handling of this mateerial. The datasheet has a phone number of 1-800-253-7837 for the North American area.