Alkali-resistant glass fiber has a high degree of corrosion resistance in the environment of cement and other alkaline medium. It can be used to reinforce cement gypsum and other inorganic materials. Light in weight and high in strength, GRC is suitable for skyscrapers, civil engineering, gardens, etc. There are 2 different ZrO2 content: 14.5% and 16.5% www.fiberglass-cn.com