Silica yarns show improved thermal resistance

摘要

In US Patent 6 841 242, Saint-Gobain Quartz SAS of Courbevoie, France, provides a recipe for a silica yarn with an improved resistance to high temperatures. According to the Patent, the yarn contains 30-1500 parts per million (ppm) by weight of aluminium, and 10-200 ppm of titanium in oxidized form, while at the same time the sum of the mass of the chemical elements other than silicon and oxygen is less than 5000 ppm. The elements boron, sodium, calcium, potassium and lithium being absent or present in only small quantities.