US4461840A
Expired / Lapsed
US
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Heat resistant glass fiber composition
Assignee: Saint Gobain Isover SA France
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Filing: 1982-07-19
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Granted: 1984-07-24
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Expires: 2002-07-19
Abstract
Abstract The present invention concerns glass compositions capable of being attenuated in the form of fibers. These glass fibers comprise the following oxides in the percentages by weight: SiO2:37 to 48%; Al2O3:17 to 25%; CaO:23 to 33%; MgO:0.1 to 7%; Fe2O3:0.1 to 3%; Na2O:2 to 8%; K2O:0.1 to 7%, the sum of the percentages of earthalkaline oxides (CaO and MgO) being less than or equal to 34%, and the sum of the alkaline oxides (Na2O and K2O) being greater than 5%. The invention is applicable to the manufacture of products subjected to elevated temperatures, for instance, products used for insulation purposes, even when such products may be subjected to a temperature as high as 700 DEG C.
Inventors
- 👤 Jean-Jacques Massol
- 👤 Daniel Sainte-Foi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:54
CPC Classifications
C; C03; C03C; C03C13/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
Glass fiber characterized by a transformation temperature of at least 650° C. and by a liquidus temperature of from about 1230° C. to about 1330° C., and having a composition consisting essentially of the following ingredients in the following percentages by weight: ______________________________________
SiO.sub.2 38 to 44%
Al.sub.2 O.sub.3 17.5 to 22%
CaO 25 to 29%
MgO 0.1 to 5%
Fe.sub.2 O.sub.3 0.5 to 2.5%
Na.sub.2 O 2 to 6%
K.sub.2 O 0.1 to 6%
Impurities <3%
______________________________________ the sum of the percentages of earth-alkaline oxides being less than or equal to 34%, the sum of SiO 2 +Al 2 O 3 falls within the range of 58 to 62%, and the sum of the alkaline oxides Na 2 0+K 2 O is greater than 5% and less than or equal to 11%.
Claim 2
Dependent Claim
133 words
Glass fiber characterized by a transformation temperature of at least 650° C. and by a liquidus temperature of from about 1230° C. to about 1330° C., and having a composition consisting essentially of the following ingredients in the following percentages by weight: ______________________________________
SiO.sub.2 38 to 44%
Al.sub.2 O.sub.3 17.5 to 22%
CaO 25 to 29%
MgO 0.1 to 5%
Fe.sub.2 O.sub.3 0.5 to 2.5%
Na.sub.2 O 2 to 6%
K.sub.2 O 0.1 to 6%
Impurities <3%
______________________________________ the sum of the percentages of earth-alkaline oxides being less than or equal to 34%, the sum of SiO 2 +Al 2 O 3 falls within the range of 58 to 62%, and the sum of the alkaline oxides Na 2 0+K 2 O is greater than 5% and less than or equal to 11%.
Claim 3
Dependent Claim
25 words
Glass fiber according to claim 1, characterized in that the sum of Al 2 O 3 +CaO falls within the range of 45 to 50%.
Claim 4
Dependent Claim
38 words
Glass fiber according to claim 1, characterized in that its composition by weight is as follows: ______________________________________
SiO.sub.2
42.3%
Al.sub.2 O.sub.3
18.5%
CaO 27.7%
MgO 0.3%
Fe.sub.2 O.sub.3
1.7%
Na.sub.2 O
4.3%
K.sub.2 O
4.3%
Impurities
0.9%
______________________________________
Claim 5
Dependent Claim
38 words
Glass fiber according to claim 1, characterized in that its composition by weight is as follows: ______________________________________
SiO.sub.2
39.4%
Al.sub.2 O.sub.3
18.9%
CaO 28.7%
MgO 0.6%
Fe.sub.2 O.sub.3
1.9%
Na.sub.2 O
4.6%
K.sub.2 O
5.0%
Impurities
0.9%
______________________________________
References Cited (Backward Citations)
FR1356354A
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US3900329A
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US3799836A
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US3736162A
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SU458522A1
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FR2318832A1
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SU581104A1
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JPS5356207A
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US4365984A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-24 | 1988-01-23 | 1988-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-24 | 1992-01-23 | 1992-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-24 | 1996-01-23 | 1996-07-24 | $7700.00 | Window Closed / Lapsed |