As we we know that there are three main types of fillers in electric heating tubes, quartz sand, alumina and magnesium oxide. Today we will give you a brief introduction to the quartz sand filled with electric heating tubes.
According to its chemical composition, quartz sand mainly contains 98% -99% SiO2 and 1-2% impurities (Fe2O3, Al2O3, MgO). Its specific gravity is 1.5-1.7g / cm3 in the free state, and the softening temperature is 1700 degree. Under compression, its specific gravity is about 2.3g / cm3, and its thermal conductivity is 0.01-0.011Kcal / cm * ℃ * h. The particles of quartz sand used in the heating tube are sieved through a sieve with 500-1000 holes per square centimeter.
Pure quartz sand is widely distributed in nature, so when the surface temperature of the electric heating tube is higher than 450 degrees, it is not suitable to use this material as a filler.
All of Jaye's electric heating tubes do not use quartz sand as a filler, so do not worry about when using at high temperatures.