How To Degas Viscous Materials with a Vacuum Pump

Failed to load the video

RTV-2 silicone rubber and polyurethane are commonly used materials when making silicone mold casting resin, because these materials have a certain viscosity, mixing and stirring will produce bubbles, the most common tool to remove the bubbles is a vacuum pump, the above video explains the use of vacuum pumps and precautions in great detail through example operations.

The purpose of the vacuum pump is to remove as much air as possible from your chamber in a short time. It is very suitable for degassing resins with a short pot life or used in a production environment with fast turnover, but it is also fully suitable for a variety of Degassing materials, such as RTV silicone rubber, urethane resin, urethane rubber and epoxy resin casting resin.

The time to run the pump depends on the amount of silicone you degas and the size of the chamber. Before mixing the silicone, please consider the time required to add the two parts of silicone and mix, the time required to vacuum in the chamber, the time required to degas the silicone, and the time to pour the silicone into the mold box. The greater the amount of silicone, the longer the time required for degassing. All these hours should be less than your open working hours for that particular silicone.

Vacuum pumps for silicone and resin degas are relatively small. They do not take more than a square foot on your work table or floor. They do not vibrate and can be easily placed on the same table as your vacuum pot or other equipment. Vacuum pumps that small do not make much of a noise. Their humming is relatively low. Considering that the degassing of silicone takes only minutes the noise the pump makes should not be a concern when picking your pump.

Because vacuum pumps require oil to run there is a very slight odor they produce. It is not irritating at all, and it's gone as soon as you turn the pump off.


Related Tutorials

  • video

    Making Jewelry Clear Silicone Molds and Inject Wax

    The video details the entire process of making a silicone mold for ring jewelry and injecting it with wax, with clear explanations of each step, especially the cutting technique after the silicone is formed.…

  • video

    How to Make Silicone Molds for Casting Thin Wall Resin

    In the past, the two-part silicone mold cavities we made were relatively wide and thick. This video records the production of very thin cavity silicone molds.…

  • video

    Make Figurine Silicone Molds and Cast Resin

    This is a video tutorial for replicating figurine crafts using rtv silicone raw materials, each step is very detailed and has precautions, very suitable for beginners.…

  • video

    How to Make a Bronze Sculpture Silicone Mold Making

    This video records in detail the process of making silicone molds for bronze sculptures, as the shape of this model is more complex, the process used here is to make a two-part silicone mold to cast resin.…