Refractory and insulating bricks has low thermal mass which means that it does not retain heat, low thermal conductivity and is an extremely effective insulation material. Dita refractory and insulating â product family is a group of lightweight, thermally efficient ceramic fiber insulating materials that combine the advantages of dimensional stability at high temperatures with complete resistance to thermal shock. Featuring a broad range of thermal capabilities and physical characteristics, this product family provides proven and effective solutions to a variety of heat processing applications.