Fiberglass (Fibreglass) is an inorganic non-metallic material with excellent performance. There are many types. The advantages are good insulation, strong heat resistance, good corrosion resistance, and high mechanical strength, but the disadvantage is that it is brittle and has relatively high wear resistance. difference. It is made of pyrophyllite, quartz sand, limestone, dolomite, boronite, and boronite as raw materials through high-temperature melting, drawing, winding, weaving and other processes. The diameter of its monofilament is several A micrometer to more than twenty micrometers, equivalent to 1/20-1/5 of a hair strand, each fiber strand consists of hundreds or even thousands of monofilaments. Glass fiber is usually used as a reinforcing material in composite materials, electrical insulation materials and thermal insulation materials, circuit boards and other fields of the national economy.
On October 27, 2017, the World Health Organization’s International Agency for Research on Cancer published a preliminary list of carcinogens for reference. Special-purpose fibers, such as E glass and "475" glass fibers, are in the 2B category carcinogen list, and continuous glass fibers In the list of 3 carcinogens
Melting point Glass is a kind of amorphous. It has no fixed melting point. It is generally considered that its softening point is 500~750℃
Boiling point 1000 ℃
When glass fiber is used as a reinforcing material for reinforced plastics, the biggest feature is its high tensile strength. The tensile strength is 6.3～6.9 g/d in the standard state and 5.4～5.8 g/d in the wet state. The density is 2.54g/cm3. Good heat resistance, no effect on strength when the temperature reaches 300℃. It has excellent electrical insulation and is a high-level electrical insulation material. It is also used as a thermal insulation material and fire shielding material. Generally only corroded by concentrated alkali, hydrofluoric acid and concentrated phosphoric acid.
Its main components are silica, alumina, calcium oxide, boron oxide, magnesium oxide, sodium oxide, etc. According to the alkali content in the glass, it can be divided into alkali-free glass fiber (sodium oxide 0% to 2%, belonging to aluminum Borosilicate glass), medium alkali glass fiber (sodium oxide 8%-12%, which is boron-containing or boron-free soda-lime silicate glass) and high-alkali glass fiber (sodium oxide above 13%, which is soda-lime Silicate glass).