Al2O3-containing, high-temperature resistant glass sliver with highly textile character, and products thereof

An Al2O3-containing, heat resistant glass staple fiber product produced from an Al2O3-containing, heat stable, silica based glass sliver, obtained by acid extraction of a glass sliver,

• wherein the glass sliver comprises glass staple fibers having different lengths,
• wherein each glass staple fiber has a length of 50 to 1000 mm;
• wherein the glass sliver before the acid extraction comprises the following composition:
• 70-75% (wt.) SiO2
• 15-25% (wt.) Na2O and/or K2O
• 1 to 5% (wt.) Al2O3 and up to a maximum of 5% (wt.) of further components,
• wherein the glass sliver after the acid extraction is heat stable at temperatures above 400° C.;
• and
• wherein the glass sliver after the acid extraction comprises:
• 95 to 99% (wt.) SiO2
• 1 to 5% (wt.) Al2O3.

An Al2O3-containing, heat stable, silica based glass sliver, obtained by acid extraction of glass slivers with an inorganic or organic acid, optionally in the presence of soluble silicones,

• wherein the sliver comprises glass staple fibers having different lengths;
• wherein each glass staple fiber has a length of 50 to 1000 mm;
• and
• wherein the glass sliver after the acid extraction contains the following components in the specified mass proportions:
• 85 to 99% (wt.) SiO2
• 1 to 5% (wt.) Al2O3
• 0 to 10% (wt.) Na2O and/or K2O
• 0 to 3% (wt.) CaO
• 0 to 2% (wt.) MgO
• 0 to 2% (wt.) B2O3
• 0 to 1% (wt.) TiO2
• 0 to 1% (wt.) Fe oxides,
• 0 to 1% (wt.) ZrO2
• 0 to 0.5% (wt.) BaO
• 0 to 0.5% (wt.) PbO
• 0 to 0.5% (wt.) ZnO
• 0 to 0.5% (wt.) Cr2O3 and
• 0 to 0.5% (wt.) F.

An Al2O3-containing, heat stable, voluminous glass staple fiber product produced from an Al2O3-containing, heat stable, voluminous silica based glass sliver obtained by extraction of glass slivers with an inorganic or organic acid, optionally in the presence of soluble silicones containing the following components in the specified mass proportions:

• 85 to 99% (wt.) SiO2 1 to 5% (wt.) Al2O3 0 to 10% (wt.) Na2O and/or K2O 0 to 3% (wt.) CaO 0 to 2% (wt.) MgO 0 to 2% (wt.) B2O3 0 to 1% (wt.) TiO2 0 to 1% (wt.) Fe oxides, 0 to 1% (wt.) ZrO2 0 to 0.5% (wt.) BaO 0 to 0.5% (wt.) PbO 0 to 0.5% (wt.) ZnO 0 to 0.5% (wt.) Cr2O3 and 0 to 0.5% (wt.) F
• wherein the sliver comprises fibers having different lengths;
• and
• wherein each glass staple fiber has a length of 50 to 1000 mm.

A method for thermal or acoustic insulation, comprising applying to an area to be insulated an Al2O3-containing, heat stable, glass sliver obtained by acid extraction of a glass sliver;

• wherein the sliver comprises glass staple fibers having different lengths;
• wherein each glass staple fiber has a length of 50 to 1000 mm;
• and
• wherein the glass sliver contains the following composition:
• 70-75% (wt.) SiO2
• 15-25% (wt.) Na2O and/or K2O
• 1 to 5% (wt.) Al2O3 and up to a maximum of 5% (wt.) of further components,
• wherein the glass sliver shows thermal strength at temperatures above 400° C.;
• wherein the glass sliver after the acid extraction comprises:
• 95 to 98% (wt.) SiO2
• 2 to 5% (wt.) Al2O3.

A method for thermal or acoustic insulation, comprising applying to an area to be insulated an Al2O3-containing, heat stable, silica based glass sliver comprising the following components in the specified mass proportions:

• 85 to 99% (wt.) SiO2
• 1 to 5% (wt.) Al2O3
• 0 to 10% (wt.) Na2O and/or K2O
• 0 to 3% (wt.) CaO
• 0 to 2% (wt.) MgO
• 0 to 2% (wt.) B2O3
• 0 to 1% (wt.) TiO2
• 0 to 1% (wt.) Fe oxides,
• 0 to 1% (wt.) ZrO2
• 0 to 0.5% (wt.) BaO
• 0 to 0.5% (wt.) PbO
• 0 to 0.5% (wt.) ZnO
• 0 to 0.5% (wt.) Cr2O3 and
• 0 to 0.5% (wt.) F.

A method for reinforcing a matrix material, comprising incorporating into said matrix an Al2O3-containing, heat stable, silica based glass sliver, obtained by acid extraction of a glass sliver;

• wherein the sliver comprises glass staple fibers having different lengths;
• wherein each glass staple fiber has a length of 50 to 1000 mm;
• and
• wherein the glass sliver contains the following composition:
• 70-75% (wt.) SiO2
• 15-25% (wt.) Na2O and/or K2O
• 1 to 5% (wt.) Al2O3 and up to a maximum of 5% (wt.) of further components
• wherein the glass sliver shows thermal strength at temperatures above 400° C.,
• wherein the glass sliver after the acid extraction comprises:
• 95 to 99% (wt.) SiO2
• 1 to 5% (wt.) Al2O3.

An Al2O3-containing, heat stable, glass sliver on silica basis, consisting of the following components in the specified mass proportions:

• 85 to 99% (wt.) SiO2
• 1 to 5% (wt.) Al2O3
• 0 to 10% (wt.) Na2O and/or K2O
• 0 to 3% (wt.) CaO
• 0 to 2% (wt.) MgO
• 0 to 2% (wt.) B2O3
• 0 to 1% (wt.) TiO2
• 0 to 1% (wt.) Fe oxides,
• 0 to 1% (wt.) ZrO2
• 0 to 0.5% (wt.) BaO
• 0 to 0.5% (wt.) PbO
• 0 to 0.5% (wt.) ZnO
• 0 to 0.5% (wt.) Cr2O3 and
• 0 to 0.5% (wt.) F.

An Al2O3-containing, heat stable, voluminous silica based glass sliver, obtained by acid extraction of a glass sliver having the following composition:

• 70-75% (wt.) SiO2
• 15-25% (wt.) Na2O and/or K2O
• 1 to 5% (wt.) Al2O3 and up to a maximum of 5% (wt.) of further components
• wherein the glass sliver after the acid extraction comprises:
• 95 to 99% (wt.) SiO2
• 1 to 5% (wt.) Al2O3
• wherein the glass sliver is heat stable at temperatures above 400° C.;
• and
• wherein the heat stable glass sliver has a pore volume between 10 and 25 mm3/g.