1. Validity period of solder paste: when sealed and stored at 0 ℃ ~10 ℃, the validity period is 6 months. (Note: the new solder paste shall be labeled with status, dated and filled in the solder paste in and out control form before being put into the refrigerator.)

2. After the solder paste is opened and sealed, the storage time shall not exceed 24 hours.

3. When production ends or printing is stopped for some reason, the remaining solder paste on the steel sheet of the laser steel mesh shall not be placed for more than 1 hour.

4. When printing is stopped and no longer used, the remaining solder paste should be bottled, sealed and refrigerated separately. The remaining solder paste can only be used continuously once, and the rest can only be discarded.