When you load a new 1 ml syringe from a 10 ml solder paste syringe, you first need to purge all the air from the setup.
- Attach a 18-gauge blunt needle to the 10 ml syringe.
- Advance the 10 ml syringe plunger until solder paste oozes out of this needle.
- Move the 1 ml syringe plunger to about 0.1 ml.
- Insert the blunt 18-gauge needle into the end of the 1 ml syringe until you touch the rubber plunger.
- Push the 10 ml syringe plunger so solder paste starts to fill the 1 ml syringe.
- As the 0.10 ml void fills, rotate the body of the 1 ml syringe so you fill the void and force out all the air.
- Once you fill the end of the 1 ml syringe, pull out the 18-gauge needle.
- Now that the 1 ml syringe is purged of air, advance its plunger until all the solder paste is completely expelled; after this point, ‘do not’ pull on the 1 ml syringe plunger.
- Replace the 10 ml syringe 18-gauge needle with a Luer Lock coupler.
- Fill the coupler with solder paste by advancing the 10 ml syringe plunger.
- When the coupler is full of paste, connect it to the 1 ml syringe.
- You can now finish filling the 1 ml syringe with solder paste; suggest you fill to 0.3 ml or 0.4 ml.
Unless you accidentally pull back on the 1 ml syringe plunger, you do not have to purge it again.
