IRPC One Report 2022 EN

Product Company Capacity (Unit: Thousand Tons) % HDPE IRPC Plc 120 6 Thai Polyethylene Co., Ltd. 1,000 52 PTT Global Chemical Plc 800 42 Total 1,920 100 PP IRPC Plc 775 33 HMC Polymers Co., Ltd. 830 36 Thai Polypropylene Co., Ltd. 720 31 Total 2,325 100 ABS IRPC Plc 180 66 Ineos ABS (Thailand) Co., Ltd. 95 34 Total 275 100 EPS IRPC Plc 48 100 Total 48 100 PS IRPC Plc 120 33 Siam Polystyrene Co., Ltd. 150 42 GC Styrenics Co., Ltd. 90 25 Total 360 100 Domestic Polymer Producers and Capacities in 2022 Feedstock Procurement The main feedstock for IRPC’s production is crude oil. The company procures most of the crude oil from the Middle East through PTT and purchases some crude on the open market. In addition, the company also procures crude from domestic sources, which offer lower prices and transportation costs. Crude oil from abroad is transported by large crude oil tankers to the deep seaport located in the same area as IRPC’s refineries and production complex and fed into the company’s production process, making feedstock management more efficient. In 2022, IRPC’s purchase of crude oil as feedstock accounted for 81% of its total raw materials. Sources of its crude oil are as follows: Middle East (Saudi Arabia, UAE, etc.) 73%, the Far East 5%, domestic sources 4%, and from other regions 18%. 56-1 One Report 2022 70 IRPC PUBLIC COMPANY LIMITED

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