Glass fiber for high temperature insulation

Abstract

A glass composition is provided for the production of high temperature glass fibers with oxides comprising 1% to 15% Fe 2 O 3 +FeO as a fluidizer to lower liquidus temperature and the fiberizing temperature of a mix of high temperature oxides. The glass composition has therein an appropriate content of high temperature oxides to produce glass fiber with high temperature limits and high burn-through properties.

1 . A glass composition for producing high temperature glass fiber wherein iron oxide comprises 1% to 15% Fe2O3+FeO as a fluidizer medium to lower the liquidus temperature and the fiberizing temperature of a mix of high temperature oxides. 
     
     
         2 . A glass composition according to  claim 1  wherein the glass composition produces a high temperature fiber mat with a burn-through temperature up to 2,400° F. 
     
     
         3 . A glass composition having an iron oxide range according to  claim 1 , and having the appropriate content of other high temperature oxides to be capable of producing glass fiber having high temperature use limits and high burn-through properties. 
     
     
         4 . A glass composition according to  claim 1 , and having an appropriate iron content, high temperature oxides and other oxides to be capable of producing glass fibers having good chemical resistance. 
     
     
         5 . A glass composition having an iron oxide range according to  claim 1 , and having the appropriate iron content and high temperature oxides and other oxides is adapted to produce glass fibers having good water resistance with minimum use of binder to protect fiber surfaces, said fibers yielding good results according to accelerated aging studies. 
     
     
         6 . A glass composition having a high iron content according to  claim 1 , and having the appropriate iron content and other high temperature oxides is adapted to produce glass fibers having good thermal conductivity, good acoustical, properties, high strength, and high burn through properties. 
     
     
         7 . A glass composition for producing glass fiber from a chemistry wherein iron oxide comprises 1% to 15% iron oxide of the oxide weight percent as a fluidizer medium to lower liquidus temperature and fiberizing temperature in order to prevent devitrification of a glass chemistry using other high temperature oxides. 
     
     
         8 . A glass composition having an iron oxide range according to  claim 7 , and having a content of high temperature-oxides capable of producing glass fiber having a temperature use limit greater than 2,400° F. 
     
     
         9 . A glass composition according to  claim 7  and having iron content, high temperature oxides and other oxides to be capable of producing glass fibers having chemical resistance to water created, as by condensation created by cycling an aircraft to high and low altitudes, the chemical resistant being a result of replacing alkali metal in the glass with iron oxide. 
     
     
         10 . A glass composition having an iron oxide range according to  claim 7  and such content of high temperature oxides an& other oxides as to produce glass fibers having chemical resistance with less than 4% of a binder coating to protect fiber surfaces, said fibers having tensile strengths greater than 5 pounds on virgin fibers and greater than 1 pound after 30 days of accelerated aging. 
     
     
         11 . A glass composition having iron content according to  claim 7  and having other high temperature oxides adapted to produce glass fiber having a density range of 0.4-0.6-1.5 pounds per cu. ft. and thermal conductivity with properties of 0.25 to 0.64 (ASTM C177) at temperatures ranging from 50° F. to 400° F., and providing temperature protection over a range of +70° F. to −30° F. 
     
     
         12 . A glass composition having iron content according to  claim 7  and having other high temperature oxides to produce glass fibers having acoustical properties in excess of those required by applicable regulations ASTM C-243 and ASTM C-90, over a range of 200-4000 db. 
     
     
         13 . A glass composition having iron content according to  claim 7  and having additional high temperature oxides to produce glass fibers having strength in excess of 300,000 psi on nascent monofilaments and bonded mat strength in excess of 5 pounds. 
     
     
         14 . A glass composition having iron content according to  claim 7  and having other high temperature oxides adapted to produce glass fibers containing no alumina that have a solubility dissolution rate of 10 to 30 days in human body fluids as determined by in vivo tests in animals. 
     
     
         15 . A bio-soluble glass composition with a liquidus temperature of approximately 2400° F. for producing high temperature glass fibers capable of being formed into an insulation blanket having burn through properties compliant with FAA Regulation FAR 25.856(b), said glass composition comprising:
 at least 74 wt % SiO 2 ; 
 at least 2.6 wt % Fe 2 O 3 +FeO ; 
 at least about 8% wt % CaO+MgO+TiO 2 ; 
 up to about 6 wt % Na 2 O+Li 2 O+K 2 O+B 2 O 3 , and essentially no other oxides. 
 
     
     
         16 . The glass composition of  claim 15 , wherein the Fe 2 O 3 +FeO have a combined wt % of not more than about 10. 
     
     
         17 . The glass composition of  claim 16 , wherein the Fe 2 O 3 +FeO have a combined wt % of about 3. 
     
     
         18 . The glass composition of  claim 16 , wherein the Fe 2 O 3 +FeO have a combined wt % of about 8. 
     
     
         19 . The glass composition of  claim 16 , wherein the i Fe 2 O 3 +FeO have a combined wt % of about 5. 
     
     
         20 . The glass composition of  claim 16 , wherein the Fe 2 O 3 +FeO have a combined wt % of about 10. 
     
     
         21 . The glass composition of  claim 16 , wherein the SiO 2  has a wt % of not less than about 75. 
     
     
         22 . The glass composition of  claim 17 , wherein the SiO 2  has a wt % of not less than about 77. 
     
     
         23 . The glass composition of  claim 15 , wherein the combined wt % of CaO and MgO is at least 10. 
     
     
         24 . The glass composition of  claim 15 , wherein the wt % of CaO is at least about 5 and of MgO is at least about 3. 
     
     
         25 . A glass fiber made from the glass composition of  claim 15 , wherein the wt % of Fe 2 O 3 +FeO is less than 11.95%. 
     
     
         26 . A glass fiber made from the glass composition of  claim 15 , wherein the wt % of CaO+MgO+TiO 2  is less than about 15%. 
     
     
         27 . A glass fiber made from the glass composition of  claim 15 , wherein the wt % of Fe 2 O 3 +FeO is less than about 11.95% and the wt % of CaO+MgO+TiO 2  is less than about 15%.