Quarterly report pursuant to Section 13 or 15(d)

Ownership Percentage (Details)

v3.20.2
Ownership Percentage (Details)
Jun. 30, 2020
Mar. 31, 2020
PQ Silicates Ltd.    
Schedule of Equity Method Investments    
Ownership percentage 50.00%  
Zeolyst International    
Schedule of Equity Method Investments    
Ownership percentage 50.00%  
Zeolyst C.V.    
Schedule of Equity Method Investments    
Ownership percentage 50.00%  
Asociacion para el Estudio de las Tecnologias de Equipamiento de Carreteras, S.A. (“Aetec”)    
Schedule of Equity Method Investments    
Ownership percentage 20.00%  
Quaker Holdings    
Schedule of Equity Method Investments    
Ownership percentage   49.00%