ilton Keynes (UK) 100.00 Evonik UK Holdings Ltd. Milton Keynes (UK) 100.00 Evonik United Silica Industrial Ltd. Taoyuan Hsien (Taiwan) 100.00 Evonik United Silica (Siam) Ltd. Rayong (Thailand) 70.00 Evonik Vietnam Limited Liability Company Ho-Chi-Minh City (Vietnam) 100.00 Evonik Wellink Silica (Napping)