Insulation formed of precipitated silica and fly ash
AssigneeGeneral Electric Company
InventorsRobert W. Barito, Kenneth L. Downs
Life of this patent
Estimating the term…
Abstract
Precipitated silica is mixed with a fly ash material and is employed as an insulating material having a low thermal conductivity. The mixture of precipitated silica and fly ash material is dried, compressed, placed in an evacuable pouch, and evacuated. The resulting board-like insulation configuration is used directly as insulation. The board-like material which is produced may be used as insulation in household refrigerators and freezers by placing it in an insulation space between the inner liner and the outer case and encapsulating the board-like material with a foamed insulating material.
Claims19
A slab of board-like material for use as a thermal insulation comprising:
- a. a precipitated silica and a fly ash material, there being between 30% and 70% of said fly ash material based upon the total weight of said precipitated silica and fly ash material;
- and
- b. a gas and water tight envelope containing said mixture of precipitated silica and fly ash material.
A process for forming a thermal insulation panel comprising:
- a. forming a slab of board-like material for use as a thermal insulation comprising a mixture of precipitated silica and fly ash material, said fly ash material comprising between 30% and 70% said mixture;
- b. drying said mixture of precipitated silica and fly ash material at a temperature sufficient to drive off surface water;
- c. compressing said mixture of precipitated silica and fly ash material to a density of from 10 to 35 pounds per cubic foot;
- d. placing said compressed mixture of precipitated silica and fly ash material in an envelope;
- and
- e. sealing said envelope.
A thermal insulation material comprising a precipitated silica and a fly ash material, there being between 30% and 70% of said fly ash material based upon the total weight of said precipitated silica and fly ash material.
A process for forming an insulating layer between an inner wall and an outer wall of a cooling device comprising:
- a. forming a slab of board-like material for use as a thermal insulation comprising a mixture of precipitated silica and fly ash material, said precipitated silica comprising at least 30% of said mixture;
- b. drying said mixture of precpitated silica and fly ash material at a temperature sufficient to drive off surface water;
- c. compressing said mixture of precipitated silica and fly ash material to a density of from 10 to 35 pounds per cubic foot;
- d. placing said compressed mixture of precipitated silica and fly ash material in a gas and water tight envelope;
- e. evacuating said gas and water tight envelope;
- f. sealing said gas and water-tight envelope;
- g. attaching said sealed gas and water-tight envelope, to the surface of one wall within the insulation space of said cooling device;
- and
- h. filling the remainder of said insulation space with a foamed insulation material.
Dependencies are inferred from the claim text.