Method for increasing the strength of a porous body

Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board

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427 44, 427 451, 427 55, 427 57, 427294, 427350, 427379, 4274301, B05D 118, B05D 300, B05D 306, B05D 312

Patent

active

043383530

ABSTRACT:
A method of treating a porous body to increase its strength and resistance to weathering that includes first removing gases and moisture from the porous body by applying a vacuum to a vessel containing the body, then filling the vessel with an impregnating liquid consisting of a hardenable (cureable) resin and hardner so that the body is completely immersed while the vacuum is being applied, then applying a positive pressure to the impregnating liquid in which the body is immersed until the impregnating liquid has penetrated into the porous body the desired amount, then draining the impregnating liquid from the vessel while maintaining the positive pressure and then initiating the hardening of the hardenable liquid while maintaining the positive pressure, part of the impregnating liquid on the surface of the body being removed prior to hardening of the impregnating liquid in the body.

REFERENCES:
patent: 2174887 (1939-10-01), Kiefer
patent: 3407088 (1968-10-01), Feibush et al.
patent: 3663261 (1972-05-01), Miettinen et al.

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