E-glass fibre

E-glass, so-called because it was originally developed for electrical insulators (the boron in its chemistry improves electrical properties), is most common type of glass fibre. It is an alumina‐borosilicate glass with low levels of alkali oxides.

Production of glass fibre has become very efficient and cost-effective, with prices starting at less than 1 usd/kg, partly due to the huge demand from wind turbine manufacture, and automotive application.