The glass fiber yarn is made of glass and processed in a molten state by various molding methods. Generally divided into continuous glass fiber and discontinuous glass fiber. There are more continuous fiberglass on the market.
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One is medium-alkali glass fiber yarn, code C.
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One is an alkali-free glass fiber yarn, code E.
The main difference between them is the content of alkali metal oxides. % alkali glass fiber (12-0.5%), non-alkali glass fiber <0.5%.
There are also glass fibers of non-standard products on the market. Commonly known as high alkali glass fiber. The alkali metal oxide content exceeds 14%. The raw materials are broken glass bottles or glass bottles. Such glass fibers have poor water resistance, low mechanical strength, and low electrical insulation. It is not allowed to produce products in accordance with national regulations.
The medium and non-alkali glass of a generally acceptable glass fiber yarn product must be tightly wound around the tube. Each bobbin is marked with quantity, stock quantity and product inspection certificate including product code and grade, standard quantity, grade, stamped special quality inspection stamp, net weight, and the factory name, product code and grade should be indicated on the package. Standard number, net weight, date of manufacture, and lot number.