PPG Industries Inc. Industrias Qu?micas del Ebro
SA
Evonik Industries AG
Tata Chemicals Ltd
AntenChem Co. Ltd
Solvay SA
PQ Corporation
W.R. Grace & Co.
Oriental Silica Corporation
Tosoh Silica Corporation
Huber Engineered Materials
Supersil Chemicals (I) Pvt. Ltd
Madhu Silica Pvt. Ltd
Gujarat Multi Gas Base Chemicals Pvt. Ltd
and Wacker Chemie AG