A refractory product which is not impregnated with tar or pitch, wherein a sample of the refractory product, measured after heat-treating the sample in a non-oxidizing atmosphere at 1200°C, provides physical properties wherein an apparent porosity is 7% or less; a total void volume of pores having a pore diameter of 1 μm or less is 80% or more of an integrated void volume of pores of the entire sample of the refractory product; and a gas permeability is 50 × 10 -17 m 2 or less, wherein the apparent porosity is measured by JIS R 2205: 1992, the total void volume of pores having a pore diameter of 1 μm or less is measured by JIS R 1655: 2003, and the gas permeability is measured by JIS R 2115: 2008, using a refractory sample having a sample shape of 18 × 18 × 80 mm; wherein the refractory product is formed as a sliding nozzle plate, wherein a Weibull modulus (shape index) obtained from a three-point bending test of a sample cut out of a portion of the sliding nozzle plate other than a boss portion of the sliding nozzle plate is 15 or more, wherein the Weibull modulus is measured by JIS R 1625: 2010 using a refractory sample having a sample shape of 18 × 18 × 80 mm subjected to heat treatment in a non-oxidizing atmosphere at 1200°C; wherein in the refractory product, a mixture to be subjected to shaping contains, with respect to 100% by mass of the entire chemical components of the mixture: one selected from the chemical components consisting of Al 2 O 3, SiO 2, MgO and ZrO 2 in an amount of 84% by mass to 97% by mass, or two or more selected from the chemical components consisting of Al 2 O 3, SiO 2, MgO, ZrO 2, Cr 2 O 3 and CaO, or one or more compounds or solid solutions of the two or more chemical components, in a total amount of 84% by mass to 97% by mass; one or more carbide components selected from SiC and B 4 C in a total amount of less than 4% by mass; one or more selected from the group consisting of Al, Si and Mg as metals in a total amount of 1% by mass to less than 7% by mass; and a carbon component in an amount of 1% by mass to less than 4% by mass. an apparent porosity is 7% or less; a total void volume of pores having a pore diameter of 1 μm or less is 80% or more of an integrated void volume of pores of the entire sample of the refractory product; and a gas permeability is 50 × 10 -17 m 2 or less, wherein the apparent porosity is measured by JIS R 2205: 1992, the total void volume of pores having a pore diameter of 1 μm or less is measured by JIS R 1655: 2003, and the gas permeability is measured by JIS R 2115: 2008, using a refractory sample having a sample shape of 18 × 18 × 80 mm; wherein the refractory product is formed as a sliding nozzle plate, wherein a Weibull modulus (shape index) obtained from a three-point bending test of a sample cut out of a portion of the sliding nozzle plate other than a boss portion of the sliding nozzle plate is 15 or more, wherein the Weibull modulus is measured by JIS R 1625: 2010 using a refractory sample having a sample shape of 18 × 18 × 80 mm subjected to heat treatment in a non-oxidizing atmosphere at 1200°C; wherein in the refractory product, a mixture to be subjected to shaping contains, with respect to 100% by mass of the entire chemical components of the mixture: one selected from the chemical components consisting of Al 2 O 3, SiO 2, MgO and ZrO 2 in an amount of 84% by mass to 97% by mass, or two or more selected from the chemical components consisting of Al 2 O 3, SiO 2, MgO, ZrO 2, Cr 2 O 3 and CaO, or one or more compounds or solid solutions of the two or more chemical components, in a total amount of 84% by mass to 97% by mass; one or more carbide components selected from SiC and B 4 C in a total amount of less than 4% by mass; one or more selected from the group consisting of Al, Si and Mg as metals in a total amount of 1% by mass to less than 7% by mass; and a carbon component in an amount of 1% by mass to less than 4% by mass. one selected from the chemical components consisting of Al 2 O 3, SiO 2, MgO and ZrO 2 in an amount of 84% by mass to 97% by mass, or two or more selected from the chemical components consisting of Al 2 O 3, SiO 2, MgO, ZrO 2, Cr 2 O 3 and CaO, or one or more compounds or solid solutions of the two or more chemical components, in a total amount of 84% by mass to 97% by mass; one or more carbide components selected from SiC and B 4 C in a total amount of less than 4% by mass; one or more selected from the group consisting of Al, Si and Mg as metals in a total amount of 1% by mass to less than 7% by mass; and a carbon component in an amount of 1% by mass to less than 4% by mass.