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Thread: Vacuum Desiccator made of PVC pipe

  1. #1
    chy_farm's Avatar
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    Vacuum Desiccator made of PVC pipe

    I needed a vacuum desiccator, that I use for defoaming e.g. liquid silicone rubber or liquid polyurethane prior to casting them into the molds.

    A vacuum desiccator is ; https://www.thomassci.com/scientific...um-Desiccators

    The motor sitting in the right is a vacuum pump, grey cylinder in the left is the one I made.
    Vacuum Desiccator made of PVC pipe-vacuum_desiccator_00.jpg

    Joints are of plastic plumber material, note use specific vacuum hose or it won't do the job.
    Clear top cover is a 5mm thick acrylic plate. I am sure this thickness is not sufficient, better recommend you some more thicker ones like 10mm thick. Glue this plate on top with silicone rubber.
    Vacuum Desiccator made of PVC pipe-vacuum_desiccator_01.jpg

    Table inside must be kept flat in operation,
    Vacuum Desiccator made of PVC pipe-vacuum_desiccator_02.jpg

    so you need to get a better seal to the bottom lid which is made more robust than this inner table.
    Vacuum Desiccator made of PVC pipe-vacuum_desiccator_03.jpg

    Bottom lid originally has screw around the outer edge, cut out them off so that it fits instantly to the upper housing.
    Vacuum Desiccator made of PVC pipe-vacuum_desiccator_04.jpg
    As far the bottom seal, I recommend you to chose a soft RTV rubber silicone for some casting mold use.
    First wrap the bottom edge with a wide tape to make a good round room for the seal you are going to make, pour mixed liquid RTV silicone to this room and keep it still for the required time.

    Chy

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    chy_farm's Avatar
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    This tool is used when you want to make parts that should have elasticity like rubber, so in a case you use Room Temperature Vulcanizing (RTV) rubber silicone, or liquid polyurethane. Below is a simple example I did some years ago.

    Making a mock-up with cray;
    Vacuum Desiccator made of PVC pipe-00_mock-up_00.jpg

    Place them in a container and pour liquid plaster to the top edge of the cray;
    Vacuum Desiccator made of PVC pipe-01_silicone_mold.jpg

    Take out the cray and brush off inside of the room;
    Vacuum Desiccator made of PVC pipe-02_taking_out_mock-up.jpg

    If needed place the part you need. In this case I placed a couple of polyurethane bars inside, that I will take out off the place after cure, in a purpose to get a little more elasticity to this rubber part.
    Vacuum Desiccator made of PVC pipe-03_placing_spacer_01.jpg

    Now it's the right time you use this tool, Vacuum Desiccator!
    Make mixture of A and B types of RTV silicone rubber, star it well.
    Place the container of this mixture inside of this Vacuum Desiccator, and turn on the vacuum pump.
    Keep the motor run for a minute or two, knowing a lot of foam coming off from the liquid mixture.
    Kill the motor and take out the mixture, pour it into the mold;
    Vacuum Desiccator made of PVC pipe-04_filling_silicone.jpg

    Keep the mold still for required time, take them out with care;
    Vacuum Desiccator made of PVC pipe-05_mounting_new_buffer_00.jpg

    Chy
    Last edited by chy_farm; 04-07-2018 at 10:22 PM.

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    I have a rotary vane vacuum pump that I use for complex wood-working. I also fabricate and do R&D work for loudspeaker design. Thanks for the fruitful ideas. It makes me think.

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    PJs (04-10-2018)

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    chy_farm's Avatar
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    Quote Originally Posted by mwmkravchenko View Post
    I have a rotary vane vacuum pump that I use for complex wood-working. I also fabricate and do R&D work for loudspeaker design. Thanks for the fruitful ideas. It makes me think.
    Good morning @mwmkravchenko, you seem to have a nice vacuum pump there. I too have one here, one made in France;
    Vacuum Desiccator made of PVC pipe-img_0022.jpg
    This one gives me a tad more bigger vacuum than the one I posted lately above.
    The previous one is an oil-less pump for vacuum freeze drying, which I got basically for my another homemade-vacuum-freeze-dryer
    project, but it's been on the shelf for more than five years, lol.
    Last edited by chy_farm; 04-09-2018 at 07:42 PM.

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    PJs (04-10-2018)

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    Thanks chy_farm! We've added your Vacuum Dessicator to our Miscellaneous category,
    as well as to your builder page: chy_farm's Homemade Tools. Your receipt:





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