Firebrick, also known as furnace lining, is the insulation material of wood burning furnace, protecting the furnace body from high temperature damage. Since refractory bricks endure some of the highest temperatures in a furnace, they do need to be replaced after a while. This is why they are classified as consumables on stoves and are rarely covered under warranty. The speed at which you replace a firebrick depends on how often you use the fire. (Like a tire on a car)
If the firebrick is still in place and can properly support the throat plate, it does not need to be replaced immediately. Cracked refractory bricks do not affect the performance of the furnace. A broken hairline is normal and can occur when you use fire. However, once the firebrick begins to break or fall off, its insulation performance will be reduced, which may cause irreversible damage to the furnace body, so it is necessary to replace the firebrick.
The cracking of the inner furnace brick is caused by a variety of factors, including:
Overburning: When the furnace burns too much, the temperature inside the furnace rises to a level that the lining bricks cannot withstand, causing them to crack.
Thermal stress: Rapid changes in temperature, such as when a fire starts or too much fuel is added too quickly, can cause the lining brick to expand and contract rapidly, leading to cracks.
Poor installation: If the lining brick is not installed correctly, it may appear uneven or not supported in place, resulting in cracking over time.
Age and wear: Over time, lining bricks may become worn and brittle, making them more prone to cracking.
Impact damage: An accidental impact, such as a heavy object falling on the stove or hitting the stove with a sharp tool, can cause cracking of the lining brick.
Moisture: Moisture can cause lining bricks to deteriorate over time, leading to cracking. - Cooked logs or kiln-dried logs. In the summer, moisture can also affect the furnace, and it is recommended to open and close the furnace door to allow the chimney to breathe.
It is very important to repair the cracks of the lining bricks in time to prevent further damage and ensure the safe operation of the stove.
