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German scientists have developed more environmentally friendly fireproof glass

although fireproof windows already exist, they contain a carcinogenic gel, and their production will produce a large amount of waste. However, a new technology that works in the same basic way is said to be safer and less wasteful. Usually, the window consists of two pieces of glass with a layer of transparent acrylamide based hydrogel sandwiched between them. Once the pane facing the flame is heated to the point of breaking, the gel is exposed to the flame. When the water in the gel continues to boil, the temperature of the bottom pane will be reduced through the expensive cooling effect of evaporation. In addition, the gel forms a thick layer of insulating salt on the second layer of glass to further protect it

at the meeting, scientists from Fraunhofer Institute of environment, security and energy technology in Germany conducted experiments with a variety of substances in order to find a more harmless alternative to the toxic acrylamide hydrogel. After about 60 failed attempts, they would need to adjust the control parameters of the experimental machine (i.e. conventional P, I, D parameters) at any time, and finally found that an undisclosed "basic component" met the requirements. It has no carcinogenicity and other dangers, but it can still keep the windows intact when exposed to a temperature of more than 1000 ℃. The metal air battery has the advantages of high specific energy density (the system can reach more than 400 wh/kg), long storage time (about 15 years), long standby time (3050 h) and wide temperature range (20 ℃ 60 ℃) for up to 2 hours. In addition, in a production line that is producing this kind of indoor fire doors made of glass, only 20 kg of waste is produced every day. In contrast, according to Fraunhofer, the production of traditional fire windows generates 150 to 160 kg of waste per day

at present, this kind of glass is used in the reconstruction of the world wide building in Frankfurt and the construction of the tower

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