초록 ▼

The glass compositions of the present invention contain at least 2.0 wt % Al.sub.2 O.sub.3 to give resulting glass fiber an acceptable chemical durability for product performance, but no more than 3.0 wt % to ensure the fiber maintains a relatively high biosolubility. The compositions further includ

The glass compositions of the present invention contain at least 2.0 wt % Al.sub.2 O.sub.3 to give resulting glass fiber an acceptable chemical durability for product performance, but no more than 3.0 wt % to ensure the fiber maintains a relatively high biosolubility. The compositions further include relatively high amount of Na.sub.2 O+K.sub.2 O+MgO+CaO, which tends to increase fiber biosolubility and allows for the use of reduced amounts of B.sub.2 O.sub.3 in the composition. The glass compositions have KI values that generally equal or exceed a KI value of 40 and are suitable for rotary processing. The compositions have liquidus temperatures below about 1800.degree. F. and viscosities above 300 Poise at the liquidus temperature. For higher B.sub.2 O.sub.3 compositions the liquidus temperatures are below 1650.degree. F., and the viscosities are above 1,000 Poises at the liquidus temperatures.

대표청구항 ▼

[ What is claimed is:] [1.] A glass fiber composition comprising the following ingredients in weight percent:SiO.sub.2 49-54;Al.sub.2 O.sub.3 2-3;B.sub.2 O.sub.3 5.5-15;Na.sub.2 O 16-22;K.sub.2 O 0-2;MgO greater than 0-8;CaO 7-14; andCaO+MgO>14wherein said composition has a liquidus temperature 300

[ What is claimed is:] [1.] A glass fiber composition comprising the following ingredients in weight percent:SiO.sub.2 49-54;Al.sub.2 O.sub.3 2-3;B.sub.2 O.sub.3 5.5-15;Na.sub.2 O 16-22;K.sub.2 O 0-2;MgO greater than 0-8;CaO 7-14; andCaO+MgO>14wherein said composition has a liquidus temperature 300 Poise, exhibits a viscosity of 1000 Poise at a temperature of .ltoreq.1671.degree. F. and satisfies the equation:EQU (B.sub.2 O.sub.3 +Na.sub.2 O+K.sub.2 O+MgO+CaO)-2*Al.sub.2 O.sub.3 .gtoreq.40