Contac S4 Maintenance: Refilling Chemicals

You must wear proper PPE before draining the baths in the Contac

Safety glasses/goggles

Apron

Gloves

Empty LPKF jugs and can be found in the back room

You can wash out and use empty propanol jugs if you need more storage

You will need the slotted spoon in the cabinet beneath the Contac and glass beakers from the chem room for bath 5

Plastic tubes can be found on the top shelf of the cabinet next to the Contac

Each tube is marked with which bath they're used for

Open the cover on the front of the Contac by pushing on it

Remove the plug from whichever bath you're draining by pushing on the ring around the plug while simultaneously pulling the plug out

Insert the corresponding tube

Place the other end of the plastic tube into a plastic jug (you may need to place it on a stool)

Make sure you are using the correct jug for the bath and only use a different jug if absolutely necessary

Rotate the blue valve to begin draining the bath

These baths will fill up multiple jugs, so make sure you do not overfill and cause a mess

Repeat for each bath

You will need to remove the floating balls before you can drain bath 5

Use the slotted spoon to remove the balls and place them in glass beakers

Baths can be refilled by pouring in from the top

Make sure the blue values are all closed before pouring in new chemicals

Make a log in the back of the Contac manual detailing which chemicals you changed

Pour the balls back into bath 5 after filling it

Rinse the plastic tubes, slotted spoon. and beakers with water

Wipe down the surfaces and lids of the Contac

Submit a chemical waste pickup request at https://app.essr.umd.edu/rw/chemForm

Fill out and tag each jug with a green ESSR tag from the back room

Chemical constituents can be found in the yellow SDS binder by front entrance

If the constituents don't add up to 100% then the remaining percentage is water

Place the jugs in the chemical storage cabinets under the ProtoFlow and ProtoPrint.

Activator 310 goes in the section labeled 'BASE'

Each bath follows a regular schedule of being drained and refilled with fresh chemicals:

Bath 1/2 - Cleaner 110/210: Every 3 months

Bath 3 - Activator 310: Yearly

Bath 4 - Via Cleaner: After 10 PCBs

Bath 5 - Copper Plater 400: Yearly