WO1998040322A1 - Compositions de verre doubles - Google Patents

Compositions de verre doubles Download PDF

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Publication number
WO1998040322A1
WO1998040322A1 PCT/US1998/004191 US9804191W WO9840322A1 WO 1998040322 A1 WO1998040322 A1 WO 1998040322A1 US 9804191 W US9804191 W US 9804191W WO 9840322 A1 WO9840322 A1 WO 9840322A1
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WO
WIPO (PCT)
Prior art keywords
percent
glass
components
cao
mgo
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Application number
PCT/US1998/004191
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English (en)
Inventor
Russell Marsch Potter
Jay William Hinze
Original Assignee
Owens Corning
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Owens Corning filed Critical Owens Corning
Priority to AU66828/98A priority Critical patent/AU6682898A/en
Publication of WO1998040322A1 publication Critical patent/WO1998040322A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C13/00—Fibre or filament compositions
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2213/00—Glass fibres or filaments
    • C03C2213/04—Dual fibres

Definitions

  • the present invention relates to glass compositions. More particularly, the present invention relates to dual glass compositions for producing irregularly-shaped dual glass fibers. The invention is applicable to the industrial manufacturing of glass fiber insulation.
  • Glass fiber insulation is produced, in a conventional process, by the melting of various minerals in a furnace to form a melt, the pouring of the melt into an internal centrifuge or spinner revolving at relatively high speeds and having a relatively large number of orifices in a peripheral wall thereof, to force the melt through the orifices to form fibers, optionally the further attenuation of the fibers by blowers or burners, optionally application of a size or binder to the fibers, collection of the fibers in a pack on a conveyor, and optionally curing of the size or binder in an oven.
  • the conventional process generally has used a melt having a uniform composition to form fibers that are relatively straight.
  • the conventional process generally has used the blowers or burners to not only attenuate the fibers, but also to break them as they are formed such that the fibers are generally short fibers, i.e., less than about two inches in length on average, to prevent the ropiness that tends to occur in packs made of long straight fibers.
  • the cured size or binder generally has been used to bind the short fibers together, such that the integrity of the pack is maintained during subsequent handling, and to enhance recovery of the product after packaging compression and subsequent opening of the package.
  • One conventional single component glass composition has the following composition: about 62 percent SiO 2 , about 4 percent Al 2 O 3 , about 8 percent CaO, about 4 percent MgO, about 6 percent B 2 O 3 , about 14 percent Na O, and about 2 percent K 2 O.
  • a glass fiber insulation is known that involves the fiberizing of bi-glass fibers by fiberizing into single fibers two melts having two separate compositions.
  • U.S. Patent No. 2,998,620 to Stalego discloses the formation of bi-glass curly fibers from the combination of Composition A with one of Compositions B through D: Compositions "A" "B” "C” "D"
  • WO 95/12554 disclose a method and composition for producing irregularly shaped dual glass fibers which include first and second glass compositions, wherein the first glass composition includes by weight percent approximately 50-61% silica, 0-7% alumina, 9- 13% lime, 0-5% magnesia, 14-24%) borate, 0-10% soda, and 0-2% potassium oxide, and the second glass composition includes by weight percent approximately 52-69% silica, 0-8% alumina, 6-10% lime, 0-7% magnesia, 0-8%) borate, 14-25%) soda, and 0-2% potassium oxide.
  • each irregularly shaped fiber Due to a continuously changing attenuation environment in which such fibers are formed, each irregularly shaped fiber is twisted in a substantially unique way such that in general no two fibers are exactly alike.
  • a fiber's final shape is one with a baseline curvature due to the dual-glass nature, which is modified by a twisting, irregular rotation of the plane of curvature caused by the continuously changing or stochastic attenuation environment.
  • the long, irregularly shaped fibers do not require the conventional size or binder to maintain pack structure, nor to obtain recovery after release from packaging compression.
  • a small amount of lubricant is preferably added to the fibers to enable a pack of the long, irregularly shaped fibers to attain significantly improved recovery ratios as compared to conventionally-prepared packs.
  • WO 95/12554 do have one disadvantage, however, in that the boron-rich compositions thereof are significantly more corrosive of spinners made of standard alloys than conventional glasses or than the soda-rich compositions thereof. Because the faster orifice corrosion rate of the two glasses acts as the major limiting factor on spinner life, due to eventual fiber quality problems that occur once the orifices have corroded beyond a certain point, the significant corrosion rate of the boron-rich composition is a major economic consideration in the manufacture of irregularly shaped dual glass fiber insulation. Spinners for dual glass fiber manufacture are complex and are normally made with expensive alloys, thus constituting a major expense in such insulation production. In view of the above, it is an object of the present invention to provide an improved dual glass composition and glass fiber insulation.
  • a further object of the present invention is to provide a dual glass composition that may be formed into relatively long, irregularly shaped dual glass fibers that form a pack exhibiting good structural and recovery properties.
  • a further object of the present invention is to provide a dual glass composition that is relatively less corrosive on spinners made of standard alloys, and thus that is relatively more economical to manufacture.
  • a dual glass composition of the invention includes first and second glass compositions.
  • the first composition includes the following components, indicated in weight percents: about 40 to less than 50 percent SiO 2 , greater than 3 to about 10 percent Al 2 O 3 , about 6 to about 16 percent CaO, about 0 to about 4 percent MgO, about 12 to about 27 percent B 2 O 3 , about 2 to about 13 percent Na 2 O, and about 0 to about 3 percent K 2 O, wherein the total weight percent of all components, including trace elements, if any, is 100 percent.
  • the first and second compositions have nonidentical coefficients of thermal expansion having a difference greater than about 2.0 ppm/°C, log3 viscosity temperatures within the range of from about 5 1750°F to less than 1850°F (954°C to less than 1010°C), and Hquidus temperatures less than about 1750°F (954°C) and at least 50°F (28°C) below that of the log3 viscosity temperatures.
  • the second composition preferably includes the following components, indicated in weight percents: about 48 to about 62 percent SiO 2 , greater than 3 to about 9 percent Al 2 O 3 , about 4 to about 10 percent CaO, about 0 to about 6 percent MgO, about 2 0 to about 10 percent B 2 O 3 , about 15 to about 24 percent Na O, and about 0 to about 3 percent K 2 O, wherein the total weight percent of all components, including trace elements, if any, is 100 percent.
  • glass fiber insulation including irregularly shaped dual glass fibers which include first and second glass 5 compositions having the compositions and properties described in the foregoing paragraph.
  • the present invention relates to a dual glass composition for producing irregularly shaped dual glass fibers, and to glass fiber insulation made from such fibers.
  • glass should be read inclusively, and includes at least such inorganic materials as glass, rock, slag, and basalt.
  • a method of making irregularly shaped dual glass fibers and irregularly shaped dual glass fiber insulation is well known in the prior art, including U.S. Patent No. 5,431,992 to Houpt, et al., as well as a forehearth for use therein, including U.S. Patent Application No. 08/643,198, various spinners for 5 use therein, including U.S. Patent Nos.
  • compositional ranges and properties for producing irregularly shaped dual glass fibers is disclosed in PCT Publication No. WO 95/12445, and another set for producing irregularly shaped dual glass fibers having a German KI-40 value equal to or greater than 40 is disclosed in U.S. Patent Application No. 08/639,656, which publication and application are hereby incorporated herein by reference.
  • PCT Publication No. WO 95/12445 the number of glass compositions which are satisfactory for production of irregularly-shaped glass fiber by the methods of the above-incorporated documents is actually quite small.
  • the preferred glass compositions of PCT Publication No. WO 95/12445 and the present invention are uniquely suited to that purpose.
  • the compositions disclosed in Stalego are inoperable for making irregularly-shaped glass fibers.
  • the coefficients of thermal expansion of the glasses must differ by at least 2.0 parts per million per degree Celsius (ppm/°C). Preferably, the difference is greater than about 4.0 ppm/°C.
  • the glass compositions In order for satisfactory commercial production of irregularly-shaped glass fibers, the glass compositions must also satisfy several other constraints, the first of which is viscosity. It is customary in the art to describe the viscosity of a glass as that temperature at which the glass has a viscosity of 1000 poise. This measure is commonly referred to as the log3 viscosity temperature.
  • the log3 viscosity temperature is within the range of from about 1850°F (1010°C) to about 2050°F (1121°C), preferably within the range of about 1900°F (1037°C) to about 2000°F (1093°C) and most preferably about 1950°F (1065°C).
  • Both the flow rate of glass through the spinner orifices and the rate of attenuation of the fibers are dependent on glass viscosity. If the viscosity is too high the flow of glass to the spinner orifices is reduced. This requires enlargement of the spinner orifices which, in turn, reduces the number of orifices possible for a given spinner design. Alternatively, the spinner temperature can be raised, but this reduces spinner life and, at some point, requires costly new spinner metallurgy. Additionally, higher viscosity glass requires greater blower flows and/or higher temperatures in the environment of the spinner face where glass fibers are attenuated. This resulting higher temperature reduces overall spinner life and would require costly spinner metallurgy.
  • the log3 viscosity temperatures of both glasses in the dual-glass composition of the present invention are preferably within about 75°F (42°C) of each other.
  • a large mismatch in the log3 viscosity temperatures would lead to one of two unacceptable results.
  • spinner temperatures all the flow of the more fluid glass would be through orifices it encounters early in its pathway in the spinner. This could leave some orifices starved of the more fluid glass and cause them to make essentially single-component fibers.
  • the spinner temperature is lowered, the level of the less fluid glass would build up in the spinner until it overflowed the top flange. For a glass pair with a large mismatch in viscosity, both these results could occur simultaneously.
  • Hquidus An additional constraint the glasses of the present invention must satisfy is that of Hquidus.
  • the Hquidus of a glass is the highest temperature at which crystals are stable in the molten glass. With sufficient time, a glass at a temperature below its Hquidus will crystallize. Crystallization in the furnace and forehearth can lead to the formation of solid particles which, once passed to the fiberizer, become lodged in the orifices of the spinner, plugging them. Spinner orifices may also become blocked by crystals growing directly in the spinner if the temperature of the spinner face at some point remains below the Hquidus for several hours or more.
  • the Hquidus temperatures of the two glasses define the practical lower temperature limit at which a spinner can be used to produce glass fiber.
  • a further constraint on the glass composition of the present invention is glass chemical durability. Chemical durability relates to two glass wool pack properties. The first is the ability of the glass wool pack to recover when it is opened for installation. The second is the long term physical integrity of the glass wool pack. If the glass chemical durability is too low, upon installation the glass wool pack could fail to recover to its design thickness. Whether the wool pack fails to fully recover or disintegrates too quickly, the result is a failure of the wool pack to adequately insulate.
  • a useful measure of the chemical durability of a glass fiber for an insulation application is obtained by measuring the percent weight loss of 1 gram of 10 micrometer diameter fibers after 24 hours in 0.1 liters of distilled water at 205°F (96°C).
  • the durability so measured depends strongly on the composition of the glass fibers and, to a lesser, extent, on the thermal history of the fiber.
  • fibers made from each of the glass compositions should exhibit a weight loss in this test of less than about 5% and preferably less than about 4%.
  • the chemical durability of a glass fiber depends to a lesser extent on its thermal history. Thus, for example, heating a glass fiber for several minutes at 1000°F (538°C), will improve its chemical durability somewhat.
  • the dissolution rate constant for fibers of each of the dual glass compositions it depends strongly on the glass fiber composition and, to a lesser extent, on its thermal history. It is preferable to use glass compositions having a dissolution rate constant of at least 100 ng/cm hr for all insulation fibers. Therefore, it is preferable for the dissolution rate constant for fibers of each of the dual glass compositions to be at least 100 ng/cm 2 hr. As with the chemical durability, subsequent heat treatment of the fiber will reduce its dissolution rate.
  • the 100 ng/cm 2 hr limit refers to fibers formed into a wool insulation pack in the final product form.
  • a dual-glass composition for the production of irregularly-shaped glass fibers is extremely complex.
  • Each of the individual glass compositions must satisfy narrow log3 viscosity temperature, Hquidus, and durability constraints.
  • the differentials between the coefficients of thermal expansion and log3 viscosity temperatures of the two glasses must be within the required ranges.
  • the dissolution rates also fall within desired ranges.
  • the dual-glass compositions of PCT Publication No. WO 95/12554 and the present invention include one high-borate, low-soda lime-aluminosilicate composition and one high-soda, low-borate lime-aluminosilicate composition that satisfy all constraints necessary for a successful irregularly-shaped fiber.
  • the compositions of PCT Publication No. 95/12445 were disclosed as having log3 viscosity temperatures within the range of from about 1850°F (1010°C) to about 2050°F (1121 °C), preferably within the range of about 1900°F ( 1037°C) to about 2000°F
  • the log3 viscosity temperatures and the Hquidus temperatures of the compositions of the present invention are preferably lower to allow the spinner to form fiber in a lower temperature range.
  • the present invention includes a dual glass composition including first and second glass compositions, wherein the first composition includes the following components, indicated in weight percents: about 40 to less than 50 percent SiO 2 , greater than 3 to about 10 percent Al 2 O 3 , about 6 to about 16 percent CaO, about 0 to about 4 percent MgO, about 12 to about 27 percent B 2 O 3 , about 2 to about 13 percent Na 2 O, and about 0 to about 3 percent K 2 O, wherein the total weight percent of all components, including trace elements, if any, is 100 percent.
  • the first composition includes the following components, indicated in weight percents: about 40 to less than 50 percent SiO 2 , greater than 3 to about 10 percent Al 2 O 3 , about 6 to about 16 percent CaO, about 0 to about 4 percent MgO, about 12 to about 27 percent B 2 O 3 , about 2 to about 13 percent Na 2 O, and about 0 to about 3 percent K 2 O, wherein the total weight percent of all components, including trace elements, if any, is 100 percent.
  • the first and second compositions have nonidentical coefficients of thermal expansion having a difference greater than about 2.0 ppm C, log3 viscosity temperatures within the range of from about 1750 to less than 1850°F (954°C to less than 1010°C), and Hquidus temperatures less than about 1750°F (954°C) and at least 50°F (28°C) below that of the log3 viscosity temperatures.
  • the second composition preferably includes the following components, indicated in weight percents: about 48 to about 62 percent SiO 2 , greater than 3 to about 9 percent Al 2 O 3 , about 4 to about 10 percent CaO, about 0 to about 6 percent MgO, about 2 to about 10 percent B 2 O 3 , about 15 to about 24 percent Na 2 O, and about 0 to about 3 percent K O, wherein the total weight percent of all components, including trace elements, if any, is 100 percent.
  • the first composition of the dual glass composition of the present invention includes the following components, indicated in weight percents: about 42 to about 49 percent SiO 2 , about 4 to about 10 percent Al 2 O 3 , about 9 to about 16 percent CaO, about 0 to about 4 percent MgO, about 18 to about 26 percent B 2 O 3 , about 2 to about 9 percent Na 2 O, and about 0 to about 3 percent K 2 O, wherein the total weight percent of all components, including trace elements, if any, is 100 percent.
  • the second composition of the dual glass composition of the present invention includes the following components, indicated in weight percents: about 50 to about 60 percent SiO 2 , about 4 to about 9 percent Al O 3 , about 4 to about 10 percent CaO, about 0 to about 6 percent MgO, about 2 to about 8 percent B 2 O 3 , about 18 to about 24 percent Na 2 O, and about 0 to about 3 percent K 2 O, wherein the total weight percent of all components, including trace elements, if any, is 100 percent.
  • the first glass composition of the dual glass composition of the present invention includes the following components, indicated in weight percents: about 42 to about 48 percent SiO 2 , about 5 to about 9 percent Al 2 O 3 , about 12 to about 15 percent CaO, about 1 to about 3 percent MgO, about 20 to about 24 percent B 2 O 3 , about 4 to about 7 percent Na 2 O, and about 0 to about 3 percent K 2 O, wherein the total weight percent of all components, including trace elements, if any, is 100 percent, and wherein the first and second compositions have nonidentical coefficients of thermal expansion having a difference greater than about 4.0 ppm/°C, log3 viscosity temperatures within the range of from about 1780 to about 1840°F (971°C to about 1004°C), and Hquidus temperatures less than about 1700°F (927°C).
  • the second composition of the dual glass composition of the present invention includes the following components, indicated in weight percents: about 54 to about 58 percent SiO , about 5 to about 8 percent Al 2 O 3 , about 4 to about 8 percent CaO, about 2 to about 5 percent MgO, about 2 to about 6 percent B 2 O 3 , about 20 to about 22 percent Na 2 O, and about 0 to about 3 percent K 2 O, wherein the total weight percent of all components, including trace elements, if any, is 100 percent.
  • Example A is an example of a standard dual glass composition of a type contemplated by the disclosure of PCT Publication No. WO 95/12554, while Examples B and C are examples of dual glass compositions falling within the scope of the present invention.
  • the Hquidus temperatures of the compositions of Examples B and C are considerably lower than the Hquidus temperatures of the compositions of Example A. It should be understood that, while the corrosion rate reduction advantage of the present invention is due to the lower fiberizing temperature of the high boron composition of the present invention, the log3 viscosity temperatures of both compositions must be lowered to maintain the necessary log3 viscosity temperature matching described hereinabove. In part because of the predicted dissolution rates of the compositions of Example C, Example C is believed at this time to be the best mode of practicing the invention.
  • Example A Among the more notable differences between Example A and Examples B-C are the decreased level of silica and the increased levels of lime in the boron-rich compositions of Examples B and C as compared with Example A, which help to contribute to the lower log3 viscosity temperatures thereof. It has been found that the boron-rich compositions of PCT Publication No.
  • WO 95/12554 are significantly more corrosive to spinners made of standard alloys than conventional glasses or the high expansion, soda-rich compositions thereof.
  • the boron-rich composition of Example A was tested in a spinner made of a relatively standard chromium-containing alloy, and determined to have a mean orifice corrosion rate of 11.9 thousandths of an inch (30.2 ⁇ m) per 100 hours of spinner use (mils/100 hrs), with a standard deviation of 2.0 mils (60.5 ⁇ m)/100 hrs, while the soda-rich composition of Example A was similarly tested and determined to have a mean orifice corrosion rate of 3.7 mils (111.8 ⁇ m)/100 hrs, with a standard deviation of 0.7 mils (21.2 ⁇ m)/100 hrs.
  • Standard single component glasses such as the one described hereinabove, and the high soda glass of PCT Publication No. WO 95/12554 corrode a chromium- containing alloy spinner in a manner well understood by those skilled in the art.
  • a protective chromium oxide film forms on the inside of the spinner orifices, retarding the rate of corrosion.
  • the rate of corrosion is then controlled by the dissolution of chromium oxide into the glass.
  • the dissolution rate of chromium oxide in molten glass is controlled by the mass transfer coefficient and solubility of chromium oxide in the molten glass.
  • the mean orifice corrosion rate was 4.6 mils (139.0 ⁇ m)/100 hrs, with a standard deviation of 0.3 mils (9.1 ⁇ m)/100 hrs, as compared with 3.7 mils (111.8 ⁇ m)/100 hrs, with a standard deviation of 0.7 mils (21.2 ⁇ m)/100 hrs, for Example A. It has been surprisingly discovered, however, that a reduction in the log3 viscosity temperature of the boron-rich glass composition of PCT Publication No.
  • WO 95/12554 results in a significant reduction in the rate of orifice corrosion for spinners made of standard alloys.
  • the mean orifice corrosion rate was 7.5 mils (226.7 ⁇ m)/100 hrs, with a standard deviation of 1.3 mils (39.3 ⁇ m)/100 hrs, as compared with 11.9 mils (359.7 ⁇ m)/100 hrs, with a standard deviation of 2.0 mils (60.5 ⁇ m)/100 hrs, for Example A.
  • This reduction in corrosion rate was statistically significant, and was on the order of a one-third reduction in the rate.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)

Abstract

Cette invention se rapporte à une composition de verre double conçue pour la fabrication de fibres de verre doubles de forme irrégulière, ladite composition de verre comportant une première et une deuxième compositions de verre. Ladite première composition comporte les composants suivants, indiqués en pourcentages de poids: de 40 % environ à moins de 50 % environ de SiO2, plus de 3 % à 10 % environ de Al2O3, de 6 % environ à 16 % environ de CaO, de 0 % environ à 4 pour-cent environ de MgO, de 12 % environ à 27 % environ de B2O3, de 2 % environ à 13 % environ de Na2O, et de 0 % environ à 3 % environ de K2O, le pourcentage en poids total de tous les composants, y compris des éventuels éléments en traces, étant égal à 100 pour cent. Ces première et seconde compositions possèdent des coefficients non identiques de dilatation thermique, la différence entre lesdits coefficients étant supérieure à 2,0 ppm/°C environ, des log3 de températures de viscosité supérieurs ou égaux à 1750 °F environ et inférieurs à 1850 °F (de 954 °C à moins de 1010 °C), et des températures 'liquidus' inférieures à 1750 °F (954 °C) et inférieures de 50 °F (28 °C) au moins aux logarithmes en base 3 des températures de viscosité.
PCT/US1998/004191 1997-03-12 1998-03-03 Compositions de verre doubles WO1998040322A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU66828/98A AU6682898A (en) 1997-03-12 1998-03-03 Dual glass compositions

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US81578997A 1997-03-12 1997-03-12
US08/815,789 1997-03-12

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WO1998040322A1 true WO1998040322A1 (fr) 1998-09-17

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ZA (1) ZA982063B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100496458B1 (ko) * 2002-09-02 2005-06-23 재단법인서울대학교산학협력재단 생체 흡수형 생체 활성 결정화 유리 및 그 제조 방법

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5576252A (en) * 1995-05-04 1996-11-19 Owens-Corning Fiberglas Technology, Inc. Irregularly-shaped glass fibers and insulation therefrom
US5616525A (en) * 1995-05-04 1997-04-01 Owens-Corning Fiberglas Technology, Inc. Irregularly shaped glass fibers and insulation therefrom
US5622903A (en) * 1995-05-04 1997-04-22 Owens-Corning Fiberglas Technology, Inc. Irregularly shaped glass fibers and insulation therefrom
US5629089A (en) * 1993-11-05 1997-05-13 Owens-Corning Fiberglas Technology, Inc. Glass fiber insulation product

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5629089A (en) * 1993-11-05 1997-05-13 Owens-Corning Fiberglas Technology, Inc. Glass fiber insulation product
US5672429A (en) * 1993-11-05 1997-09-30 Owens-Corning Fiberglas Technology, Inc. Glass fiber insulation product
US5576252A (en) * 1995-05-04 1996-11-19 Owens-Corning Fiberglas Technology, Inc. Irregularly-shaped glass fibers and insulation therefrom
US5616525A (en) * 1995-05-04 1997-04-01 Owens-Corning Fiberglas Technology, Inc. Irregularly shaped glass fibers and insulation therefrom
US5622903A (en) * 1995-05-04 1997-04-22 Owens-Corning Fiberglas Technology, Inc. Irregularly shaped glass fibers and insulation therefrom

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100496458B1 (ko) * 2002-09-02 2005-06-23 재단법인서울대학교산학협력재단 생체 흡수형 생체 활성 결정화 유리 및 그 제조 방법

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AU6682898A (en) 1998-09-29
ZA982063B (en) 1998-09-16

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