CERTIFICATE

ISO 9001:2015

1) IRPC Pulic Company Limited

IRI Safety Contractor Meeting 2019

2) PTT Asahi Chemical Company Limited

PTTAC Turnaround 2019

3) CTCI (Thailand) Co., Ltd.

CUP4 PHASE 1 Project

4) IRPC Public Company Limited

PW PLANT

5) IRPC Public Company Limited

BDE PLANT

6) IRPC Public Company Limited

EBSM PLANT

7) IRPC Public Company Limited

RDCC PLANT

8) IRPC Public Company Limited

IRPC Turnaround 2017

9) RAYONG Olefins Co.,Ltd.

ROC ECO Turnaround 2016