Heraeus HSQ 351 / 751
HSQ 351 and 751 are two varieties of flame fused quartz glass. HSQ 351 provides an exceptional material purity qualified for many semiconductor applications. For even more demanding applications, HSQ 751 offers significantly lower levels of aluminum, alkali and heavy metal impurities. Introduced by Heraeus in 1989, the flame fusion process is the oldest manufacturing process for quartz glass.
