<b>Feature:</b><br> quartz crystal:Quartz is made of natural crystal and silica<br> High temperature resistance：Quartz glass can be used at 1100 ° C for a long time.<br> Good thermal stability. Quartz glass has a very small coefficient of thermal expansion<br> can withstand severe temperature changes, and is stable at high temperatures.<br>In addition to hydrofluoric acid, quartz glass hardly reacts with other acids.<br><br> <b>quality after-sales service：</b><br> For the same goods, we have better quality assurance<br> Premium quality, Price Match Guarantee, please rest assured to buy<br> Please feel free to contact our customer support team when you have any question,and you will receive a satisfactory reply