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US 4,072,774 AGranted
Sealing method for porous material
AssigneeThe United States of America as represented by the Secretary of the Army
InventorFred R. Youngren
Life of this patent
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Abstract
A process for sealing a rectangular porous object against water absorption includes cleaning and drying the object to constant weight thereof, and in an ambient atmosphere immersing the object to a portion of the shortest dimension thereof in a sealant with the temperature of the ambient atmosphere and the sealant maintained at the minimum viscosity temperature of the sealant.
Claims3
A process for impregnation of a fused silica porous object having pore radii of about 0.5 to about 1 micron with a sealant in an ambient atmosphere comprising:
- cleaning contaminants from said object an drying thereof;
- immersing said object to a depth of a portion of the shortest dimension thereof in a resin sealant;
- and
- maintaining said atmosphere and said sealant at the temperature of minimum viscosity thereof for three to sixteen hours for substantially complete impregnation of the pores of said object by said sealant to provide a sealed object.
1 more element
Dependencies are inferred from the claim text.