The price of runner bricks in the market is always more expensive than that of standard refractory bricks of the same material, even 2-3 times more expensive, because of its difficulty in production and low yield rate during sintering.
The reason why runner fire bricks are expensive is first of all the mold fee, which is more than twice as expensive as standard refractories bricks, because its pressing and forming method is abnormal, which requires a certain technical content, and the brick making method is opposite to the common refractory brick unloading method, especially the funnel and center bricks, which are not as easy to unload as the direct current runner refractories bricks. The direct current is also more complicated than the standard refractory firebricks in production. In general, the center brick is hexagonal, with a large eye in the center, and the brick wall has holes at three angles. The number of times raw materials are added to the brick is two more times than the standard refractory fire bricks, and the hole molds at different angles must be removed before unloading. The unloading time is 4 times longer than that of the standard refractory firebricks.
The molds and hammers of runner bricks are different, and the usage of the manufacturer is not very large. Unlike standard bricks, which are used in large quantities and have few models, runner fire bricks have many models and are used in small quantities, which causes great trouble to the production process. The time for pressing and forming is also relatively long. This is another reason for the high price.
Another reason is that the yield rate of runner refractories brick is low. Because It have holes and thin brick walls, they are easy to cause cracks and burrs in the holes if you don't pay attention to the finished products; and runner bricksare porous bricks with many cores in the middle, resulting in low yield rate.
Finally, when runner bricks are sintered, the strange shape can only be installed in one layer on the upper layer of the kiln car, and cannot be stacked. It must be sintered with the lower layer of bricks, and the lower layer of bricks may not be at the same temperature as the runner fireclay bricks, which makes the lower layer of refractory fire bricks likely to be scrapped, so the cost of runner fire bricks is increased invisibly.
As mentioned above, the price of runner refractories bricks is much higher than that of standard refractory bricks of the same material.
