Refractories and acid resistant quartz glass tubes

   Due to the thermal coefficient and the proportion of the quartz glass tube with the crystallization product of beta cristobalite is similar, so the continuous use at high temperature, although the crystallization area expands unceasingly, but the change in volume is not obvious, can still be satisfied at this time to continue to use, can reduce the plastic deformation of the glass tube, the degree of fire resistance. When the crystallization product is cooled to 800 C, the crack network appears. When cooling down to 200-275 degrees, the structural change of the quartz from high temperature to low temperature (i.e., beta square quartz to a- square quartz) occurs, and is accompanied by volume fusion. If the crystallization layer is deep, then the quartz glass tube will also burst. Because the crystallization is often in the place of impurities, it is very important to use the surface state and the surrounding refractory before the high temperature is used.

 
   Quartz glass tube is an acid material, except for heat, it is inert to any other acid, and it is a good acid resistant material. At room temperature, alkali and salt on the corrosion degree of the quartz glass tube is minimal, so do not rule out the use of quartz glass tube in these reagents. Quartz glass tubes have better chemical properties than non quartz glass tubes because the latter is caused by the presence of bubbles in the surface area of the corrosive liquid.
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