the quartz tube can avoid corrosion,the quatz tube willnot be rotted except HF.so the quartz is better as the material of experiment apparatus. the quartz also willnot intenerate in the temperature 1000℃-1200℃ for four hours. we produce quartz for many year,if you need ,please conyact with me . also you can visit our websit,we will know us more thank you Tel:86-416-3200358 Fax:86-416-3200299