Subject of the invention is a method for recycling a glass fiber product waste to obtain recycled glass fibers. By using the waste glass mat recycling method of the invention a complete separation of the glass fibers from the binder or any other bonded precipitations is achieved. The glass fibers regained by the method are undamaged glass fibers having preserved their original geometry and mechanical performance. Surprisingly the recycled glass fibers have a surface that is very smooth, plain and wave less. A further subject of the invention is glass fiber product comprising glass fibers and at least one binder is provided, wherein the glass fibers contain at least 2% by weight of recycled glass fibers and up to 98% by weight of new glass fibers.

A method for manufacturing glass long fiber using recovered glass fiber, capable of manufacturing glass long fiber in which a recycle rate is increased, increase of a liquid phase temperature of molten glass and narrowing of an operating temperature range of the molten glass are suppressed, and a spinning temperature is low. The method includes a glass melting step of melting a glass raw material containing glass fiber recovered from a glass fiber-reinforced resin molded product, and a glass fiber mineral material to obtain molten glass; and a spinning step of spinning the molten glass to obtain glass long fiber, and a content of the recovered glass fiber in the glass raw material is in the range of 11 to 75% by mass, and differences in the contents of SiO.sub.2, Al.sub.2O.sub.3, B.sub.2O.sub.3, and CaO between the glass fiber mineral material and the recovered glass fiber satisfy a prescribed relationship.

A method for manufacturing glass long fiber using recovered glass fiber, capable of manufacturing glass long fiber in which a recycle rate is increased, increase of a liquid phase temperature of molten glass and narrowing of an operating temperature range of the molten glass are suppressed, and a spinning temperature is low. The method includes a glass melting step of melting a glass raw material containing glass fiber recovered from a glass fiber-reinforced resin molded product, and a glass fiber mineral material to obtain molten glass; and a spinning step of spinning the molten glass to obtain glass long fiber, and a content of the recovered glass fiber in the glass raw material is in the range of 11 to 75% by mass, and differences in the contents of SiO.sub.2, Al.sub.2O.sub.3, B.sub.2O.sub.3, and CaO between the glass fiber mineral material and the recovered glass fiber satisfy a prescribed relationship.

A glass composition with low thermal radiative conductivity at high temperature has the following components in weight percentage, expressed with respect to the total weight of the glass composition: SiO.sub.2 50-85%; Al.sub.2O.sub.3 0-30%, B.sub.2O.sub.3 0-20%; Na.sub.2O 0-25%; CaO 0-25%; MgO 0-15%; K.sub.2O 0-20%; BaO 0-20%; Fe.sub.2O.sub.3 total 0.002-0.1%. The glass also includes NiO at a level of 0.0001% to 0.0020% by weight of the total glass composition.

Polyphosphate glass microspheres (PGMs) are prepared using a polyphosphate coacervate. PGMs can be loaded with various therapeutic agents and can be used for various medical and dental procedures and treatments.

A useable particulate nepheline syenite having a grain size to provide an Einlehner Abrasive Value of less than about 100 is described. The particulate nepheline syenite is generally free from agglomeration and moisture free. At least 99% of the nepheline syenite particles have a size less than 10 microns.

A glass wafer having a first major surface, a second major surface that is parallel to and opposite of the first major surface, a thickness between the first major surface and the second major surface, and an annular edge portion that extends from an outermost diameter of the glass wafer toward the geometrical center of the glass wafer. The glass wafer has a diameter from greater than or equal to 175 mm to less than or equal to 325 mm and a thickness of less than 0.350 mm. A width of the edge portion is less than 10 mm.

Glass microbubbles include on an average weight basis: from 25.0 to 37.4 percent by weight of silicon; from 5.7 to 8.6 percent by weight of calcium; from 5.2 to 14.9 percent by weight, on a total combined weight basis, of at least one of sodium or potassium; from 0.3 to 0.9 percent of boron; and from 0.9 to 2.6 percent of phosphorus, wherein the weight ratio of phosphorus to boron is in the range of from 1.4 to 4.2, and wherein the glass microbubbles comprise less than 0.4 percent by weight of zinc. A raw product including the glass microbubbles, and methods of making the raw product are also disclosed.

A fining agent for reducing the concentration of seeds or bubbles in a silicate glass. The fining agent includes at least one inorganic compound, such as a hydrate or a hydroxide that acts as a source of water. In one embodiment, the fining agent further includes at least one multivalent metal oxide and, optionally, an oxidizer. A fusion formable and ion exchangeable silicate glass having a seed concentration of less than about 1 seed/cm.sup.3 is also provided. Methods of reducing the seed concentration of a silicate glass, and a method of making a silicate glass having a seed concentration of less than about 1 seed/cm.sup.3 are also described.

A method for producing a sulfide glass ceramic, including reacting a lithium compound, a phosphorus compound and a halogen compound in a solvent that contains a hydrocarbon and an ether compound to produce a sulfide glass that contains a Li element, a P element, a S element and one or more halogen elements, and heating the sulfide glass to produce a sulfide glass ceramic.