It is generally distinguished by different alkali metal oxide content.
E-glass fiber (E glass fiber) Alkali metal oxide content less than 0.05% Chemical stability, electrical insulation properties, good strength, good water resistance, mainly used as electrical insulation materials, glass fiber reinforced materials, etc.
Alkali glass fiber (C glass fiber) Alkali metal oxide content 11.5-12.5% high alkali content, can not be used as electrical insulation material, but its chemical stability and strength is still good. It is generally used for latex fabrics, woven fabric substrates, acidic filter fabrics, and window screening substrates. It can also be used as a glass reinforced plastic material that does not require strict electrical properties and strength. Lower cost and wider use
Why is alkali-free glass fiber water resistant?
The role of water and glass fiber is firstly to attack the alkali metal oxide on the surface of the glass fiber, and the water is alkaline. With the increase of time, the glass fiber and the lye continue to act until the silica skeleton is destroyed, so the alkali-free glass fiber The advantages emerged immediately.
Why alkali-resistant glass fiber has good acid resistance?
Acid and glass fiber surface metal oxides, metal oxides (Na2O, K2O) segregation, dissolved; acid and glass fiber in the role of silicate to generate silicic acid, silicic acid rapid polymerization and gel into a gel, a glass surface to form a A very thin layer of silicon oxide protective film, practice has shown that Na2O, K2O is conducive to the formation of this protective film.
What are the factors that affect the strength of FRP?
1.Effect of Fiber Diameter and Length on Tensile Strength The finer the diameter, the higher the tensile strength and the greater the length of the fiber, the lower the tensile strength.
2.Influence of Chemical Composition on Tensile Strength The higher the alkali content, the lower the strength. E-glass fibers have 20% higher tensile strength than alkali glass fibers. E-glass fiber molding temperature is high, the hardening speed is fast, the structure of the bond can be large sodium oxide, potassium oxide and other basic oxides to help the oxides, which mainly through the destruction of the glass framework, so that the structure is loose, so as to achieve the purpose of dissolution. The higher the content of sodium oxide and potassium oxide, the corresponding decrease in the strength of the glass fiber.
3.Effect of storage time on strength The strength of fiberglass after storage for a period of time will decrease – the aging of fibers. Reasons: Water and oxygen in the air eroded the fibers
4.The effect of the load time on the strength The strength of the glass fiber is especially noticeable when the ambient humidity is lowered with the increase of the applied load time. Reason: The moisture adsorbed in the micro-crack accelerates the micro crack propagation speed under the action of external forces.
Summary: E-glass fiber strength and water resistance and electrical insulation are better than the alkali glass fiber; but the alkali-resistant glass fiber has higher acid resistance and economic advantages than non-alkali glass fiber.
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