Claims
- 1. A glass composition exhibiting high radiation heat transfer resistance in the 4-40 .mu.m infrared range, said composition comprising, in weight percent relative to the total composition weight:
- 50-60% SiO.sub.2
- 4-6% Al.sub.2 O.sub.3
- 13-16% B.sub.2 O.sub.3
- 2-10% CaO
- 1-8% MgO
- 10-18% Na.sub.2 O
- 0-3 % K.sub.2 O
- 0-2% F.sub.2
- said glass composition having an HTV (10.sup.3 poise) suitable for rotary fiberization, a liquidus which is lower than the HTV by at least 80.degree. F., and a total radiation heat extinction efficiency greater than 0.1139 in the wavelength range of 4-40 .mu.m.
- 2. The glass composition of claim 1 wherein the weight percent of SiO.sub.2 is from about 54% to 60%, the weight percent of CaO is from about 3% -7%, the weight percent of MgO is from about 2% to 5%.
- 3. The composition of claim 1 wherein the HTV is in the range of about 1720.degree. F. to about 1840.degree. F.
- 4. The composition of claim 1 wherein the liquidus temperature is less than the HTV by greater than 150.degree. F.
- 5. The composition of claim 1 wherein the total radiation heat extinction efficiency is greater than 0.1150.
- 6. The composition of claim 1 wherein the biodissolution rate in simulated extracellular fluid is greater than 300 ng/cm.sup.2 hr.
- 7. The composition of claim 1 wherein the biodissolution rate in simulated extracellular fluid is greater than 500 ng/cm.sup.2 hr.
- 8. In a process for the preparation of fiberglass thermal insulation by the rotary process the improvement comprising employing the glass composition of claim 1.
- 9. In a process for the preparation of fiberglass thermal insulation by the rotary process the improvement comprising employing the glass composition of claim 2.
- 10. In a process for the preparation of fiberglass thermal insulation by the rotary process the improvement comprising employing the glass composition of claim 3.
- 11. In a process for the preparation of fiberglass thermal insulation by the rotary process the improvement comprising employing the glass composition of claim 4.
- 12. In a process for the preparation of fiberglass thermal insulation by the rotary process the improvement comprising employing the glass composition of claim 5.
- 13. In a process for the preparation of fiberglass thermal insulation by the rotary process the improvement comprising employing the glass composition of claim 6.
- 14. In a process for the preparation of fiberglass thermal insulation by the rotary process the improvement comprising employing the glass composition of claim 7.
- 15. A glass fiber insulation product exhibiting a high thermal insulation efficiency, said insulation comprising glass fibers formed from the glass composition of claim 1.
- 16. A glass fiber insulation product exhibiting a high thermal insulation efficiency, said insulation comprising glass fibers formed from the glass composition of claim 2.
- 17. A glass fiber insulation product exhibiting a high thermal insulation efficiency, said insulation comprising glass fibers formed from the glass composition of claim 3.
- 18. A glass fiber insulation product exhibiting a high thermal insulation efficiency, said insulation comprising glass fibers formed from the glass composition of claim 4.
- 19. A glass fiber insulation product exhibiting a high thermal insulation efficiency, said insulation comprising glass fibers formed from the glass composition of claim 5.
- 20. A glass fiber insulation product exhibiting a high thermal insulation efficiency, said insulation comprising glass fibers formed from the glass composition of claim 6.
- 21. A glass fiber insulation product exhibiting a high thermal insulation efficiency, said insulation comprising glass fibers formed from the glass composition of claim 7.
- 22. In a process for the preparation of single glass fiberglass insulation products wherein a single glass melt is fiberized by the rotary fiberizing process, the improvement comprising selecting as said single glass a glass having a high total radiation extinction efficiency, said single glass having a composition comprising, in weight percent relative to the total weight of the glass:
- 50-60% SiO.sub.2
- 4-6% Al.sub.2 O.sub.3
- 13-15% B.sub.2 O.sub.3
- 10-18% Na.sub.2 O
- 0-3% K.sub.2 O
- 2-10% CaO
- 1-8% MgO,
- said single glass having an HTV (10.sup.3 poise) suitable for rotary fiberization, and a liquidus which is lower than the HTV by minimally about 80.degree. F.
- 23. The process of claim 22 wherein said single glass has a total heat extinction efficiency greater than 0.1139.
- 24. The process of claim 22 wherein said liquidus is lower than said HTV by about 150.degree. F. or more.
- 25. A single glass fiberglass insulation product exhibiting a high total heat extinction efficiency, said product comprising glass fibers produced by the rotary fiberization process employing a single glass, said single glass comprising, in weight percent relative to the total weight of the glass:
- 54-60% SiO.sub.2
- 4-6% A1.sub.2 O.sub.3
- 13-15% B.sub.2 O.sub.3
- 10-18% Na.sub.2 O
- 0-3% K.sub.2 O
- 2-10% CaO
- 1-8% MgO,
- said single glass having a liquidus which is lower than the HTV (10.sup.3 poise) of the single glass by about 80.degree. F. or more.
- 26. The insulation product of claim 25 wherein the total heat extinction efficiency is greater than 0. 1139.
- 27. The insulation product of claim 25 wherein the liquidus of said single glass is lower than the HTV by about 150.degree. F. or more.
RELATED APPLICATIONS
This application is a continuation-in-part of U.S. Ser. No. 08/877,259, filed Jun. 17, 1997 now U.S. Pat. No. 5,932,499.
US Referenced Citations (4)
Foreign Referenced Citations (2)
Number |
Date |
Country |
954836 |
Apr 1964 |
GBX |
9532925 |
Dec 1995 |
WOX |
Non-Patent Literature Citations (2)
Entry |
English abstract of EP 0 738 692 Oct. 1996. |
English abstract of WO/97 39990 Oct. 1997. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
877259 |
Jun 1997 |
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