Thermal Ceramics K-Series Insulating Fire Brick (IFB) are the premier brick to handle high temperatures and act as insulation. They are commonly used to line foundry furnaces, forges and ceramic kilns. These soft bricks can easily be cut to size with a hacksaw, drilled to create burner openings or routed to create channels. With very low thermal shock characteristics, very low densities and good resistance to Alkali attack, K23’s and K26’s are the superior product on the market. If you’re looking for other sizes than what is listed, please call or email to get lead times and pricing on all other IFB products.