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US4615988A
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Glass fibers and a composition for manufacturing the same
Assignee: Saint Gobain Isover SA France
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Filing: 1984-09-19
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Granted: 1986-10-07
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Expires: 2004-09-19
Abstract
Abstract Glass fibers having the following constituents in the ranges of proportions indicated: SiO2, 57-70 wt. %; Al2O3, 2-7 wt. %; CaO, 5-10 wt. %; MgO, 0-4 wt. %; B2O3, 0-4.5 wt. %; and F, 0.5-4 wt. %; and wherein B2O3 and F are present in amounts according to the relationship: 3</=B2O3+1.5 F</=6.5 and wherein the fibers also contain the alkali oxides Na2O and K2O, in amounts according to the relationship: 16 wt. %<Na2O+K2O<20 wt. %. The glass fibers are used advantageously in thermal and/or acoustic insulation.
Inventors
- 👤 Simone Le Moigne
- 👤 Marcel Boivent
- 👤 Guy Matzen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:21
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/087; C03C13/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
186 words
Glass fibers consisting essentially of the following proportions of constituents: SiO 2 , 57 to 70 wt.%, Al 2 O 3 , 2 to 7 wt.%, CaO, 5 to 10 wt.%, MgO, 0 to 4.0 wt.%, Na 2 O, 14 to 17 wt.%, K 2 O, 0.5 to 3.5 wt.%, B 2 O 3 , 0 to 4.5 wt.%, and F, 0.5 to 4 wt.%, wherein the alkaline oxides are in proportions: 16 wt.%<Na.sub.2 O+K.sub.2 O<20 wt.% and wherein wt.% B 2 O 3 and 1.5×wt. % fluorine content is in accordance with: 3≦B.sub.2 O+1.5F≦6.5, wherein said fibers have an upper devitrification temperature of below 980° C. and the temperature corresponding to the zero devitrification rate is less than 920° C. 2. The glass fibers according to claim 1, consisting essentially of the following proportions of constituents: SiO 2 , 60 to 67 wt.%, Al 2 O 3 , 3 to 5 wt.%, CaO, 6 to 9 wt.%, MgO, 0.5 to 3.5 wt.%, Na 2 O, 14 to 17 wt.%, K 2 O, 0.5 to 3.5 wt.%, B 2 O 3 , 0 to 4.5 wt.%,
Claim 2
Dependent Claim
64 words
and F, 0.5 to 4 wt.%. 3. The glass fibers according to claim 1, consisting essentially of the following proportions of constituents: SiO 2 , 62 to 67 wt.%, Al 2 O 3 , 3 to 4.5 wt.%, CaO, 7 to 8 wt.%, MgO, 2 to 3.5 wt.%, Na 2 O, 14 to 17 wt.%, K 2 O, 0.5 to 3.5 wt.%, B 2
Claim 3
Dependent Claim
105 words
O 3 , 0 to 4.5 wt.%, and F, 1 to 4 wt.%. 4. The glass fibers according to claim 1, wherein said fibers consist essentially of SiO 2 , in the range of 62-67 wt.%; Al 2 O 3 , in the range of 3-4.5 wt.%; CaO, in the range of 7-8 wt.%; MgO, in the range of 2-3.5 wt.%; Na 2 O, in the range of 15-16.5 wt.%; K 2 O, in the range of 1-2.5 wt.%; B 2 O 3 , in the range of 0-4.5 wt.%; and F, in the range of 1.5-4 wt.%; and wherein the following relationship is satisfied:
Claim 4
Dependent Claim
30 words
3≦B 2 O 3 +1.5F≦6.5. 5. The glass fibers according to claim 1, wherein said B 2 O 3 and F are present in an amount according to the relationship:
Claim 5
Dependent Claim
33 words
4≦B 2 O 3 +1.5F≦6. 6. The glass fibers according to claim 1, wherein said B 2 O 3 and F are present in an amount according to the relationship: B.sub.2 O.sub.3 +1.5F=4.5.
Claim 6
Dependent Claim
12 words
The glass fibers according to claim 1, wherein said glass fibers have
Claim 7
Dependent Claim
22 words
an upper devitrification temperature of below 960° C. 8. The glass fibers according to claim 1, wherein the temperature corresponding to the
Claim 8
Dependent Claim
23 words
zero devitrification rate is less than or equal to 900° C. 9. A material for thermal or acoustic insulation or a combination thereof
Claim 9
Dependent Claim
23 words
zero devitrification rate is less than or equal to 900° C. 9. A material for thermal or acoustic insulation or a combination thereof
Claim 10
Dependent Claim
153 words
comprising the glass fibers according to claim 1. 10. A composition capable of being fused stably and uniformly in an electric furnace to form a glass, and having excellent viscosity and devitrification properties, which consists essentially of SiO 2 , in the range of 57-70 wt.%; Al 2 O 3 , in the range of 2-7 wt.%; CaO, in the range of 5-10 wt.%; MgO, in the range of 0-4 wt.%; Na 2 O, in the range of 1-17 wt.%; K 2 O, in the range of 0.5-3.5 wt.%; B 2 O 3 , in the range of 0-4.5 wt.%; and F, in the range of 0.5-4 wt.%; and wherein wt.% of said B 2 O 3 and 1.5×wt.% F are present in an amount according to the following relationship: 3≦B.sub.2 O.sub.3 +1.5F≦6.5, and wherein said Na 2 O and K 2 O proportions satisfy the following relationship: 16 wt.%<Na.sub.2 O+K.sub.2 O<20 wt.%.
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