The glass used to produce glass fiber is different from the glass of other glass products. The glass components currently used in commercial fibers in the world are as follows:
1.E-glass, also known as alkali-free glass, is a borosilicate glass. At present, it is widely used as a glass component for glass fiber. It has good electrical insulation and mechanical properties. It is widely used in the production of glass fiber for electrical insulation, and is also widely used in the production of fiberglass for glass reinforced plastic. Its disadvantage is that it is easy to be Inorganic acid is eroded and therefore not suitable for use in an acidic environment.
2.C-glass is also known as medium-alkali glass, which is characterized by chemical resistance, especially acid resistance, superior to alkali-free glass, but poor electrical properties, mechanical strength is lower than that of alkali-free glass fiber by 10% to 20%, usually foreign alkali-based glass The fiber contains a certain amount of boron trioxide, while China's medium alkali glass fiber is completely free of boron. In foreign countries, medium-alkali glass fiber is only used to produce corrosion-resistant glass fiber products, such as glass fiber surface felts, and also used to strengthen asphalt roofing materials. However, in China, alkali glass fiber occupies more than half of glass fiber production. (60%), widely used in the reinforcement of FRP and the production of filter fabrics, dressing fabrics, etc., because of its stronger personality than the alkali-free glass fiber.
3.High-strength glass fiber is characterized by high strength and high modulus. Its single fiber tensile strength is 2800 MPa, which is about 25% higher than that of alkali-free glass fiber. The elastic modulus is 8600 MPa, which is higher than that of E-glass fiber. The FRP products produced by them are mostly used in military, space, bulletproof armor and sports equipment. However, due to the high price, it is still not popularized in civilian use, and the world's output is about several thousand tons.
4.AR glass fiber, also known as alkali-resistant glass fiber, was mainly developed for the purpose of reinforcing cement.
5.A glass, also known as high alkali glass, is a typical sodium silicate glass, which is rarely used for the production of glass fiber because of its poor water resistance.
6.E-CR glass is an improved boron-free alkali-free glass for the production of glass fiber with good acid and water resistance. Its water resistance is 7-8 times better than that of alkali-free glass fiber, and its acid resistance is superior to that of alkali glass fiber. Less, it is a new variety developed for underground pipelines, storage tanks, etc.
7.D glass, also known as low dielectric glass, is used to produce low dielectric glass fibers with good dielectric strength.
In addition to the above glass fiber components, a new alkali-free glass fiber has appeared in recent years, which is completely free of boron, thereby reducing environmental pollution, but its electrical insulation properties and mechanical properties are similar to those of conventional E glass. There is also a glass fiber with a double glass composition which has been used in the production of glass wool and is said to have potential in the field of FRP reinforcement. In addition, there is fluorine-free glass fiber, which is an improved alkali-free glass fiber developed for environmental protection.
