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US3663250A
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Water-insensitive bonded asbestos structures
Assignee: EIDP Inc
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Filing: 1970-06-01
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Granted: 1972-05-16
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Expires: 1990-06-01
Abstract
Abstract Water-insensitive, insulating structures of fibrous asbestos bonded by an in situ-produced water-insoluble crystalline reaction product of asbestos and sodium or potassium silicate. Structures are obtained by mixing the fibrous asbestos with an aqueous solution of alkaline ionic silicate to make a damp fibrous mass, compacting the mass into a coherent article, and curing the article under controlled temperature and humidity conditions so as to maintain a water level in the article of at least 10 weight per cent, based on solids, for a period of time sufficient to produce the crystalline binder. After curing, the structures are dried, if necessary, to a water content below 20 percent based on solids.
Inventors
- 👤 Stephen A Gerow
- 👤 Verne Wesley Weidman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:25
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/24; C04B28/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
55 words
The water-insensitive structural material, made by the process comprising steps (a) to (c) of Claim 1, wherein step (a) comprises: mixing 4.22 parts filler materials, having at least 75 percent by weight reactive fibrous asbestos, with 1.0 part 31.6 weight per cent aQueous solution of sodium silicate, having an SiO2: Na2O weight ratio of 3.25:1.
Claim 2
Dependent Claim
186 words
A water-insensitive structural material con-sisting essentially of reactive fibrous asbestos bonded by an in situ-produced water insoluble crystalline reaction product of asbestos and a solution of sodium and potassium silicate, and made by the process comprising steps (a) to (c) in sequence: a. mixing 1 to 4 parts filler materials, having at least 75 percent by weight reactive fibrous asbestos, with 8 to 1 parts of an aqueous silicate solution of sodium silicate, having an SiO2:Na2O weight ratio of 3:1 to 4:1 and a solids content of 28 to 34 weight per cent, and potassium silicate, having an SiO2: K2O weight ratio of 2:1 to 2.6:1 and a solids content of 24 to 30 weight per cent; b. forming the mixture into a coherent article by compression; and c. curing the coherent article under controlled temperature and humidity conditions, whereby the water content of said article is maintained at a level of not less than about 10 percent of the weight of the water-free solids in said article, for a period sufficient to produce an article capable of withstanding 8 hours of immersion in boiling water.
Claim 3
Dependent Claim
179 words
A process for preparing water-insensitive structural materials having reactive fibrous asbestos bonded by an in situ-produced water insoluble crystalline reaction product of asbestos and sodium or potassium silicate, said process comprising steps (a) to (c) in sequence: a. mixing 1 to 4 parts filler materials, having at least 75 percent by weight reactive fibrous asbestos, with 8 to 1 parts of an aqueous solution of sodium silicate having an SiO2:Na2O weight ratio of 3:1 to 4:1 and a solids content of 28 to 34 weight per cent, or potassium silicate, having an SiO2:K2O weight ratio of 2:1 to 2.6:1 and a solids content of 24 to 30 weight per cent; b. forming the mixture into a coherent article by compression; and c. curing the coherent article under controlled temperature and humidity conditions, whereby the water content of said article is maintained at a level of not less than about 10 percent of the weight of the water-free solids in said article, for a period sufficient to produce an article capable of withstanding 8 hours of immersion in boiling water.
Claim 4
Independent Claim
161 words
A method for reducing the quantity of dust emissions for asbestos-silicate products comprising the steps (a) to (c) in sequence: a. mixing 1 to 4 parts filler materials, having at least 75 percent by weight reactive fibrous asbestos, with 8 to 1 parts of an aqueous solution of sodium silicate, having an SiO2:Na2O weight ratio of 3:1 to 4:1 and a solids content of 28 to 34 weight per cent, or potassium silicate, having an SiO2:K2O weight ratio of 2:1 to 2.5:1 and a solids content of 24 to 30 weight per cent; b. forming the mixture into a coherent article by compression; and c. curing the coherent article under controlled temperature and humidity conditions, whereby the water content of said article is maintained at a level of not less than about 10% of the weight of the water-free solids in said article, for a period sufficient to produce an article capable of withstanding 8 hours of immersion in boiling water.
References Cited (Backward Citations)
US1966069A
Cited
US1976946A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |