are in terms of oxide represented in mass percentage application_number US 98808506 A description hereinafter a glass fiber composition and a glass fiber of the present invention and composite material using the same will be described in detail based on the examples table 1 shows compositions of the glass fiber composition according to the example of the present invention and evaluation results thereof in the table glass composition is indicated in terms of mass first a glass batch row material formed by weighting out and mixing together a predetermined amount of glass raw materials that constitute each glass composition was introduced in platinum rhodium crucible and was heated and melt within an indirect hearing type electric furnace in atmosphere at 1500 u00b0 c fox five hours the molten glass was stirred using heat resistant stirring rod during the heating and melting in order to form homogeneous molten glass thereafter the homogeneous molten glass was introduced into a carbon mold to be cast into a predetermined shape the resultant was slowly cooled and the final glass molded body for measurement was obtained physical properties of each glass composition in the example shown in table 1 were measured by the following procedure the forming temperature tx corresponding to the viscosity of the molten glass of 10 3 dpa u00b7 s was calculated by interpolation of the viscosity curve which was obtained by measuring viscosity values at several timings according to a platinum sphere pulling method after each glass molded body was introduced into an alumna crucible was subjected to reheating and was heated until it melted regarding the liquidus temperature ty each glass molded body was cut into a predetermined form to be grinded to have a predetermined.