ARKEMA INC.
ASAHI KASEI CHEMICALS CORP.
BASF
CHEVRON PHILLIPS CHEMICAL
CHI MEI CORP.
COVESTRO
DSM ENGINEERING PLASTICS
DUPONT INC.
EASTMAN CHEMICAL
EMS GRIVORY
EVONIK INDUSTRIES AG
IDEMITSU KOSAN
INEOS STYROLUTION AMERICAS LLC
LANXESS CORP.
LOTTE ADVANCED MATERIALS CO. LTD.
LUCITE INTERNATIONAL
LYONDELLBASELL INDUSTRIES
MITSUBISHI ENGINEERING PLASTICS
MITSUI CHEMICALS AMERICA INC.
PLASKOLITE INC.
PPG INDUSTRIES INC.
SABIC INNOVATIVE PLASTICS
SOLVAY SPECIALTY POLYMERS USA LLC
SPARTECH
TEIJIN KASEI AMERICA INC.
TOPAS ADVANCED POLYMERS GMBH
TORAY PLASTICS (AMERICA) INC.
TOTAL PETROCHEMICALS USA
TRINSEO LLC
ZEON Corp.