Silicon nitride is very strong, especially hot pressed silicon nitride, which is one of the hardest substances in the world. It is extremely resistant to high temperatures, its strength can be maintained to a high temperature of 1200 °C without falling, it will not melt into a melt after heating, it will decompose until 1900 °C, and it has amazing chemical resistance and can withstand almost all inorganic acids. And less than 30% caustic soda solution can also resist the corrosion of many organic acids; at the same time it is a high-performance electrical insulation material. Machinable Glass Ceramic Sleeve, White Zirconia Ceramic,Customized Machinable Glass,Alumina Ceramic Polishing Ring Dongguan Haikun New Material Co., Ltd. , https://www.hkceram.com
London, June 2 news: The London Metal Exchange (LME) has the following changes in inventory in the five trading days as follows: (in tons) Variety of relatively new stocks June 2 June 1 May 31 May 27 5 On the 26th of the month of copper 44,225 -1100 -900 +600 -1,775 -2,825 Aluminum 565,850 -5875 -750 +21,950 -3,125 -200 Tin 3,630 -25 -120 -80 +215 +100 Lead 32,050 +2350 -2,550 -1,050 -400 - 150 Zinc 522,200 -725 -1,900 -525 -750 -1,575 Nickel 8,052 -12 +186 +258 +276 +36 Aluminum alloy 42,480 -300 +180 -160 -140 -80 NASAAC 113,100 +1140 -160 -220 -620 -520 *NASAAC is a North American specialty aluminum alloy