E glass, alkali-free glass: alkali metal oxide content is less than 0.8%,

Features: stable chemical properties, excellent electrical insulation properties, good mechanical strength

C glass: medium alkali glass: alkali metal oxide content is 11.6%-12.4%

Its characteristic is that its acid resistance is better than alkali-free glass, but its electrical properties are poor and its mechanical strength is 10%~20% lower than alkali-free glass fiber.

A glass: high-alkali glass, with an alkali metal oxide content of more than 16%, also known as clay fiberglass.

Its characteristics are that its mechanical properties are much lower than those of no-alkali and medium-alkali, and it is not resistant to water erosion. Under the erosion of moisture in the atmosphere, the product will quickly become brittle. It is an early product of my country's fiberglass industry and is now being phased out. The country has clearly canceled the high-alkali fiber products produced in clay crucibles, which cannot be used as reinforcing materials for fiberglass. However, high-alkali fibers produced by non-ceramic crucibles can also be used to make acid-resistant products. Alkali resistance, insulation, and mechanical properties: E > C > A, acid resistance: E < C < A.

Alkali metal oxide: generally refers to potassium and sodium metal oxides, namely Na2O and K2O. Alkali metal oxide is one of the main components of ordinary glass. Its main function is to reduce the melting point of glass. The higher the content of alkali metal oxide, the chemical properties of fiberglass The more stable the performance, the corresponding electrical insulation performance and strength will be reduced.