| What size porosity can be sealed?
Micro-porosity causing "weepers" is usually easy to seal. For larger micro-porosity and macro-porosity sealing depends on wall thickness and the type of porosity present. Straight through porosity in thin walls is difficult to seal. Sponge like porosity of any type can usually be sealed. 100% solid resin will seal porosity many times larger than other impregnants. Impco Resins effectively seal powder metal parts of 6.4 density representing 19% porosity by volume with pore sizes up to 20 microns against hydraulic oil pressures up to 10,000 psi.
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