The classification of refractory materials products is generally divided into standard type, general type, special type and other types:
(1) Standard type. Normally, the straight fire bricks with the external dimensions of 230mmX114mmX65mm are called standard refractory bricks.
(2) General type. The ratio of external dimensions (the ratio of the minimum and maximum dimensions, the same below) is within the range of 1: 4, without recessed corners,holes or grooves, its unit weight is 2~8kg clay refractory material products, 2~6kg siliceous refractory material products, 2~10kg high-aluminum refractory material products,magnesium or magnesia-aluminum refractory material products of 4~10kg are called general products.
(3) Abnormal shape.
1) Clay and high-alumina special-shaped refractory material products. Where the ratio of external dimensions is within the range of 1; 6, and there are no more than 2concave angle (including arc-shaped concave angle), or with an acute angle of 50°~75*, or with no more than 4 grooves, and its weight clay bricks with a weight of 2-15kg and high-alumina products with a weight of 2-18kg are called special-shaped products.
2) Silicone special-shaped refractory material products. Where the ratio of external dimensions is within 1: 5, with not more than 1 concave angle, or with silica products with an acute angle of 50*~ -75°, or with no more than 2 grooves and a weight of 2~12kg, are called silicon special-shaped refractory products.
3) Special-shaped refractory products of magnesium or magnesium aluminum. All products that are not included in this series of general products are classified as special products.
(4) Special Type of Refractory Material Product.
1) Special products of clay and high alumina. Where the ratio of external dimensions is within the range of 1:8, with no more than 4 recesses angle (including arc-shaped concave angle) or an acute angle of 50°~30°, or no more than 8 grooves, or no more than 1 hole, clay products weighing 1.5~30kg and high alumina products 1.5~35kg are called special type taste.
2) Silicone special products. Where the external dimension ratio is within the range of 1:6, with no more than 4 concave corners (including round Arc-shaped concave angle inside), or with an acute angle of 50°~30° or with 4 grooves, or with no more than 1 perforation, which silicon products weighing 1.5~25kg are called special products.
3) Special magnesium products. Where the size ratio of the shape is within 1: 8 with no more than 4 concave angles (including arc-shaped concave angles), or with an acute angle of 30°~50°; or with no more than 3 perforations; or with no more than magnesium products with 4 grooves with a unit weight of 3~35kg are called special products.
