'U' values ??are defined as: lowe glass hollow under ASHRAE standard conditions, since the glass thermal conductivity and the temperature difference between indoor and outdoor air is formed to transfer heat air. Its imperial units: British thermal units per hour per square foot per Fahrenheit metric units: watts per square meter per degrees Celsius, 'u' value is lower, the heat transfer through the glass the lower the thermal insulation performance glazing the better. Radiation rate is the ratio of heat per unit area of ??an object with radiation heat per unit area blackbody radiation at the same temperature, the same conditions. Emissivity of an object is defined as the ability to absorb or reflect heat. In theory totally blackbody for all wavelengths with 100% absorption. That reflection rate is zero. Thus, blackbody radiation was 1.0. These three types of fire-resistant glass according to fire resistance rating can be divided respectively i level (≥90min), ⅱ level (≥60min), ⅲ level (≥45min), ⅳ level (≥30min). China's building code requirements, all the characteristics of the product lowe glass mounted on the partition of fire safety requirements, it should be government of the province to the national fire brigade sampling of fireproof material designated test center to test lowe glass performance must meet regulatory requirements, and obtain inspection reports issued by the agency before they sell! So when we buy fire-resistant glass can look at these businesses have no inspection reports, purchase regular glass in order to protect our personal safety! lowe glass features, Taian lowe glass, Yiu Hui trusted by Jinan Glass Co., Ltd. Yaohui. Jinan Yaohui Glass Co., Ltd. (www.jyhhc.com/) strong, credible, in Jinan, Shandong architectural glass industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Jinan Yaohui into the brilliant glass and you work for a better future!