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Porosity sealing is done through the process of vacuum impregnation. Vacuum impregnation is a preferred OEM process that seals porosity and leak paths in metal castings, sintered metal parts and electrical castings that form during the casting or molding process.
Porosity is a fraction between 0 and 1, typically ranging from less than 0.005 for solid granite to more than 0.5 for peat and clay. The porosity of a rock, or sedimentary layer, is an important consideration when attempting to evaluate the potential volume of water or hydrocarbons it may contain.
Long immersion in boiling-hot—96–100 °C (205–212 °F)—deionized water or steam is the simplest sealing process, although it is not completely effective and reduces abrasion resistance by 20%. [6] The oxide is converted into its hydrated form and the resulting swelling reduces the porosity of the surface.
Degassing [4] is a process that may be required to reduce the amount of hydrogen present in a batch of molten metal. Gases can form in metal castings in one of two ways: by physical entrapment during the casting process or; by chemical reaction in the cast material. Hydrogen is a common contaminant for most cast metals.
Seal (emblem), applying a seal to a document for authentication; Sealing wax, a wax material of a seal which, after melting, hardens quickly; Duct sealing, the sealing of leaks in air ducts; Induction sealing, method of heating a metal disk to seal a cap or top on a container; Porosity sealing, the process of filling a porous substrate to make ...
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Porosity sealing (Resin Impregnation) fills all interior spaces, and may or may not leave a thin coating on the surface, depending on the wash/rinse performance. The main application of vacuum impregnation porosity sealing is in boosting the dielectric strength of transformers, solenoids, lamination stacks or coils, and some high voltage ...