Three forms of porosity in the casting
1) The encapsulated or enclosed pore
2) One side open or blind porosity
3) Through porosity
Impregnation according to the Maldaner process fills the open pores.
Cast parts that are machined after impregnation can leak again if unfilled porosities are cut open;
Therefore, we recommend impregnation after the final machining.
The prerequisite for best impregnation results is that the work pieces are free of grease and the internal porosity is clean and completely dry. By applying vacuum, the air trapped in the porosity is evacuated. |
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Impregnation sealant can penetrate into the porosity due to the vacuum removing all of the air. |
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After the vacuum has been released, the impregnation sealant is forced into the porosity by atmospheric pressure and thus penetrates even the finest porosity.
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In a water bath the components surface is washed so no surface film remains. No additional washing is necessary afterwards.
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Curing of the sealant takes place in the hot polymerisation bath. Rapid initial curing at the surface prevents bleeding out of the sealant from the porosity.
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