Frits are indispensable constituents of most industrial ceramic glazes which mature at temperatures below 1150 °C. Frits are typically intermediates in the production of raw glass, as opposed to pigments and shaped objects, but they can be used as laboratory equipment in a number of high-tech contexts. Frits made predominantly of silica, diboron trioxide (B2O3), and soda are used as enamels on steel pipes. Another type of frit can be used as a biomaterial, which is a material made to become a part of, or to come into intimate contact with, one or more living organisms. Molten soda-lime-silica glass can be "poured into water to obtain a frit", which is then ground to a powder. These powders can be used as "scaffolds for bone substitutions". Also, certain frits can be added to high-tech ceramics: such frits are made by milling zinc oxide (ZnO) and boric acid (H3BO3) with zirconium (Zr) beads, then heating this mixture to 1100 °C, quenching it, and grinding it. This frit is then added to a lithium titanate (Li2TiO3) ceramic powder, which enables the ceramic to sinter at a lower temperature while still keeping its “microwave dielectric properties." Sintering is the high temperature fusing together of powder to form a solid, usually porous, material. In laboratory and industrial chemical process equipment, the term "frit" denotes a filter made by the sintering-together of glass particles to produce a piece of known porosity referred to as fritted glass. The word is also used in a looser sense to denote a filter of "any" composition (for example, stainless steel, polyethylene) that is substituted where a frit of glass may otherwise have been used. Also frit is used as a main component in manufacturing of ceramic engobe by ceramic tile producers. And as a result of the broad using of frit in the ceramic tiles industry many frit factories were established recently in many countries such as Egypt.