How to reduce silicone bubbles

Core Tip: Vacuum has two purposes. One is to fully wet the rubber compound and the filler, so that the rubber material can fully cover the printed board to reduce the gap between the insulating material and the component. The second is to completely empty the air inside the assembly to make the rubber compound. Fills the components together to improve the electrical and shock resistance of the components.

What should I do if I have a silicone bubble? Here are the tips to help you solve

The first is that the bubbles brought in during mixing are not excluded. It can be solved by vacuuming or centrifuging. You can also take a period of time (30 minutes - 2 hours) to wait for the bubbles to float up.

The second is that the formulation of silica gel contains a small amount of volatile impurities, which vaporize to form bubbles when heated and cured. You can take a low-temperature baking method, let these impurities first evaporate, and then increase the temperature to cure, so there are no bubbles.

Vacuuming has two purposes. One is to fully wet the rubber compound and the filler, so that the rubber material can fully cover the printed board to reduce the gap between the insulating material and the component. The second is to completely empty the air inside the assembly to fill the rubber compound and components. In a whole, improve the electrical and shock resistance of the components. If there are a lot of air bubbles in the component, the electrical performance will decrease after potting. In the case that the rubber does not overflow, the degree of vacuum should be as high as possible, and the final vacuum is not less than 0.09 MPa, and there is no bubble overflow in the rubber.

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