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HSQ 400 / HSQ 800

HSQ 400
HSQ 400 combines the excellent properties of HSQ 300 – high purity, low thermal expansion, good optical transmittance and low bubble content – with the advantage of long process lifetime at high temperatures. This property derives from a special surface treatment that introduces a stabilization layer during running in of the product.

Characteristics / Special features:

Temperature resistance by specific recrystallization

Products and applications:

Long-term high-temperature processes over 1160 °C

HSQ 800
HSQ800 combines highest purity requirements with increased process stability at high temperatures. This property is similarly achieved by surface stabilization of HSQ700. Please contact our customer service for further questions.

Characteristics / Special features:

Low alkali content and temperature resistance by specific recrystallization

Products and applications:

Long-term high-temperature processes over 1160 °C with maximum purity requirements

Chemical purity – Typical trace elements and OH content in the bulk in quartz glass (ppm by weight oxide)
Elements Al Ca Cl Cr Cu Fe K Li Mg Mn Na Ti Zr OH Content
HSQ 400* 15 0.5 n. s. <0.05 <0.05 0.1 0.4 0.6 0.05 <0.05. 0.3 1.1 0.7 <30
HSQ 800* 15 0.5 n. s. <0.05 <0.05 0.1 0.1 0.05 0.05 <0.05 0.05 1.1 0.7 <30
* Tubes of this material grade have an approx. 20µm thick outer layer that contains a chemical precursor to trigger cristobalite-formation.