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The vacuum impregnation process explained

How it works

Vacuum impregnation is widely accepted as the best solution to sealing porosity in cast components. During the vacuum impregnation process, parts are subjected to a dry vacuum and the microscopic holes causing porosity are filled with a thermally and chemically resistant polymer to provide a permanent seal.

Impregnation process stages

There are five key stages to the vacuum impregnation process:

1. Part Preparation

Parts to be impregnated should be clean and dry before the process begins.

2. Vacuum Impregnation

Air is evacuated from the porosity within the components using a dry vacuum.

The vacuum is released and liquid sealant penetrates the porosity, filling the voids.

3. Drain

Components are rotated and indexed about the horizontal axis to drain and recover excess sealant. The drained sealant is returned to the autoclave for re-use.

4. Cold Wash

Components are rotated and indexed under a cascade of wash water solution removing sealant from all component surfaces. When using Ultraseal Recycling Technology, any sealant that is recycled is returned to stage 2 via the Sealant Recycling System (SRS).

5. Hot Cure

Combining a wash and heating process to maintain a high standard of surface cleanliness and polymerisation of the sealant within the porosity of the components.

Watch the vacuum impregnation process video

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