Its characteristics are high strength, high modulus, its single fiber tensile strength of 2800MPa, about 25% higher than the alkali-free glass fiber tensile strength, elastic modulus 86000MPa, higher than the E-glass fiber strength. The fiberglass products produced by them are used in military industry, space, bulletproof armor and sports equipment. However, because of its high price, it has not yet been promoted in terms of civilian use. The world production is also around a few thousand tons.