1. Ace Heat Tech
2. Anderman Ceramics Inc.
3. Donghai Yukang Quartz Material Co. Ltd.
4. Fudong Lighting LLC
5. Heraeus Quarzglas GmbH & Co. KG
6. inzhou new century Quartz Glass Co. Ltd.
7. Jinzhou Meihua Quartz Glass Co. Ltd.
8. Lianyungang Lanno Quartz Co. Ltd.
9. Pegasus Industrial Specialties Inc.
10. QSIL SE
11. Quartz Scientific Inc.
12. RAESCH Quarz (Germany) GmbH
13. SHANGHAI WECHANCE INDUSTRIAL CO. LTD.
14. Technical Glass Products Inc.