Abstract: Provided is an anti-reflection glass substrate comprising an anti-reflection layer having a predetermined thickness from the surface, the anti-reflection glass substrate being characterized in that the anti-reflection layer has at least two layers of a first layer and a second layer successively provided in the depth direction from the surface, each of the first layer and the second layer has a plurality of pores, and the porosity of the first layer is smaller than the porosity of the second layer. In addition, provided is a method for manufacturing an anti-reflection glass substrate, the method successively comprising a step of etching a glass substrate using a first etching liquid and a step of etching the glass substrate using a second etching liquid, the method being characterized in that the molarity of multivalent metal ions of the first etching liquid is larger than the molarity of multivalent metal ions of the second etching liquid.

Abstract: Provided is an anti-reflection glass substrate comprising an anti-reflection layer having a predetermined thickness from the surface, the anti-reflection glass substrate being characterized in that the anti-reflection layer has at least two layers of a first layer and a second layer successively provided in the depth direction from the surface, each of the first layer and the second layer has a plurality of pores, and the porosity of the first layer is smaller than the porosity of the second layer. In addition, provided is a method for manufacturing an anti-reflection glass substrate, the method successively comprising a step of etching a glass substrate using a first etching liquid and a step of etching the glass substrate using a second etching liquid, the method being characterized in that the molarity of multivalent metal ions of the first etching liquid is larger than the molarity of multivalent metal ions of the second etching liquid.

Abstract: Disclosed is a polyester resin composition for a covering material of a cable. The present invention provides the polyester resin composition for a covering material of a cable including a polyester resin as a base resin, including 0.1 to 4 parts by weight of amide-based wax as an internal lubricant, based on 100 parts by weight of the polyester resin as the base resin. The polyester resin composition according to the present invention has advantages that the resin may be uniformly and completely melted using only the general equipments such as an extruder with an L/D ratio of less than 30 and a single-stranded screw without an additional investment for equipments, and also has such an improved processability that protrusions are minimized upon forming a covering layer of a cable, as well as an excellent mechanical properties such as tensile strength, elongation, etc.