It is well known since ancient times is the fuel bricks baked bricks we call sintering process. The disadvantage is that the sintering process energy consumption, destroying farmland, pollute the environment and destroy the ecological balance, is a nature conservation unburned saving wall made ​​of materials suitable for high-temperature, coal resource-poor gap is large and wall materials the high price of regional development in order to achieve good economic returns. Unburned waste land use and industrial waste brick, fertile and able to protect the environment, simple process, improve labor conditions, and can be produced throughout the year, and its mechanical strength at 7.5 - between 15M Pa, frost resistance qualified , softening coefficient of 0.65 - 0.85, with a sintering surface smooth red brick that are not accurate size, beautiful appearance, etc., is 80s new wall materials development. Lack of fuel in southern China, and rich yellow soil, red soil resources, the development of new technologies unburned with good social and economic significance.
    At present, foreign developers unburned mainly in tropical and subtropical regions near the equator. Such as Brazil, Mexico, Algeria, Ghana, Syria, Kenya, Tanzania, Morocco, Thailand, Singapore, and Taiwan Province of China. China is currently mainly in the development and application of the southern region, Zhejiang, Hainan, Guangdong, Guangxi, Fujian and other provinces as the focus, followed by parts of Yunnan, Sichuan, Jiangxi, Hunan and Guizhou provinces. In recent years, the main raw material for the development and application of unburned industrial waste, such as the application of fly ash, cinder and carbide slag and other waste. In the northern part of the development and application of unburned areas also, such as Shandong, Liaoning and Heilongjiang.
    Unburned due to the molding pressure is high, dense, and thus its density is greater than the red brick, the surface is too smooth. Secondly, if the production process control is not good, it will cause poor water and the stability of the brick on the atmosphere stable performance. These are the main disadvantages of unburned. However, if production can be noted in the quality of these shortcomings can be overcome. Construction of low-rise buildings in the countryside, much bigger impact on the weight of the brick. So, currently the product in many rural and urban housing applications. With improvements in the future development of new materials and production processes brick, the unburned more broad application prospects.