Glass composition with low thermal expansion coefficient and glass fiber made of the same

A glass composition, consisting of:

• a main material, comprising silicon dioxide having a percentage by weight of 59%-63% of the glass composition;
• a reinforcing material for improving structural strength of the glass composition, comprising aluminum oxide having a percentage by weight of 15%-16.5% of the glass composition;
• a fluxing material for lowering a thermal expansion coefficient and a viscosity temperature of the glass composition, comprising magnesium oxide, zinc oxide, and titanium dioxide, wherein a percentage by weight of magnesium oxide is 6%-8.5% of the glass composition, a percentage by weight of zinc oxide is 2.5%-3.5% of the glass composition, and a percentage by weight of titanium dioxide is 1.5%-3.5% of the glass composition;
• boron trioxide having a percentage by weight of 7.8%-10% of the glass composition;
• and
• at least one alkali metal oxide that includes at least one of sodium oxide and potassium oxide for lowering dielectric loss of the glass composition, wherein a sum of every single one of the at least one alkali metal oxide has a percentage by weight of, or below, 0.33% of the glass composition,
• wherein a percentage by weight of lithium oxide in the glass composition is 0;
• the percentage by weight of silicon dioxide, the percentage by weight of aluminum oxide, the percentage by weight of magnesium oxide, the percentage by weight of zinc oxide, the percentage by weight of titanium dioxide, the percentage by weight of boron trioxide, a percentage by weight of calcium oxide, the percentage by weight of at least one alkali metal oxide, and a percentage by weight of ferric oxide together constitute 100% of the glass composition;
• and the thermal expansion coefficient of the glass composition is equal to or higher than 2.37 ppm/° C., and lower than 2.5 ppm/° C.