Vacuum chamber operation

Reducing bubbles

You may note that a good, vigorous mixing puts a lot of bubbles into the silicone! This can be reduced by pouring carefully, but we recommend vacuuming out most of it. Essentially, we'll be sucking out all the air trapped inside!

The seal is formed with an O-ring (orange) and a thick piece of acrylic. When replacing them, make sure the O-ring is centered on the edge of the pipe and the acrylic fully covers the top.

We advise putting paper towels or similar beneath the silicone tub in case some of it spills.

CAREFUL - the silicone will foam up SIGNIFICANTLY! It may overflow if it's more than 1/2-- 2/3 full! If your container is very full, try vacuuming in two batches / cups.

Vacuuming

Check that the Air release valve (right) is closed firmly. ((righty-tighty lefty-loosey))
The vacuum pump is located left and Down of the chamber. flick the switch to turn it on. It will be loud and emit a bit of grey smoke. This is Okay.
The pressure indicator should Change as it begins. if it doesn't check the air valve.
Vacuum for ~5 minutes or until the silicone is no longer bubbling significantly. Like popcorn!
Moniter the silicone as it foams and rises. Try not to let it spill-- you can turn off the pump if it gets too tall. If you have severe trypophobia you may find the foaming upsetting.

To remove

Once you're done vacuuming--

Turn off the air pump
turn the air release valve. it should only be finger-tight. Air will flood back into the chamber, you may see your tissues flapping.
1. if for some reason you have very light objects in the vaccuum chamber, be mindful that a quick release may send them flying. Let the air enter slowly.
Once the pressure gage reaches normal again, you should be able to lift the acrylic cap and retrieve your project.
If the cap resists being lifted, DO NOT PUSH IT. release more air. Never force the seal, as you may hurt yourself or damage equipment.

Page updated

Report abuse