IRPC Annual Report 2023

• Supplier, Competitor and Creditor IRPC strictly adheres to the principles of procurement with transparency and fairness. The company’s business relationships with its suppliers are based on mutual concern for potential impacts on human rights, communities and the environment, in accordance with good corporate governance principles. The company maintains close communication with its suppliers and collaborates with them to establish corporate culture and good practices, including campaign against offering or accepting gifts, and encouraging suppliers to join Collective Action Against Corruption (CAC) for SMEs, advocating human rights policy and persuading key suppliers to participate in activities to promote corporate governance, like PTT Group CG Day, IRPC CG Day, and IRPC Cubic Academy Season 9, etc. Supplier: IRPC underscores equal treatment of suppliers, ethical conduct in doing business with them for mutual benefits in strict compliance with the law and agreed-upon rules to move toward building a lasting partnership. The company has established a policy for managing its relationship with partners, starting with selecting suppliers with great potential, providing them with supervisory oversight to encourage them to take on social and environmental responsibility, in compliance with relevant laws and regulations as well as quality management system standards. Suppliers are also subjected to assessment to ensure they live up to the IRPC Supplier Sustainable Code Of Conduct and meet the Green Procurement standard as well as to maintain good working relationships. Since 2022, IRPC has applied digital technology systems for the management of Green Procurement to meet the requirements for greater efficiency and more streamlined workload of users within the company and those external users on the suppliers’ side. In 2023, the company has developed E-Forms as follows: Digital transformation of documents to electronic forms by digitizing various forms used in procurement with a view to make it possible to input data and seek approval through the Procurement Digital System (PDS) instead of using paper documents or other types of soft files. In addition, the company also invited suppliers to join Collective Action Against Corruption (CAC) as part of the campaign to build a transparent and corruption-free business network. For this, IRPC received CAC Change Agent Award 2023. Competitor: IRPC’s treatment of its competitors aligns with the international framework of free competition and in compliance with laws governing trade competition. The company treats competitors fairly and never seeks a competitor’s trade secrets through dishonest or improper means. It also never attempts to destroy a competitor’s reputation through malicious accusations or verbal attacks. Moreover, IRPC never agrees with a competitor or any person to circumvent or limit free competition. Creditor: IRPC strictly honors all obligations it has with trade creditors and financial institutions. The company never attempts to conceal facts or information that ought to be in public disclosed in any manner that could cause damage to its creditors. IRPC has implemented many policies and guidelines on the way it interacts with creditors – especially the terms of guarantee, capital management, and in the event of a default – to prevent payment failures or breaches of contract. Nonetheless, in the event that the company becomes aware of its inability to fulfill any obligation, it will always notify its creditor without delay, and work with the creditor to find a suitable solution based on reasonableness. The company is committed to maintaining lasting relationships with all creditors. Public Sector IRPC Group regards the public sector as one of its key stakeholders, and therefore refrains from any business activity that may lead to impropriety or action that is incompatible with the good corporate governance principles in its interaction with government officials or public sector agencies. The company has made clear its anti-corruption stance and will never offer bribes to government officials for convenience or undue benefits. IRPC’s policy on its interaction with the public sector is disclosed in the company’s Good Corporate Governance and Business Ethics Handbook. In addition, the company also carries out various activities in collaboration with the public sector, such as: - Established an Emergency Communication Center (ECC) in Rayong Province to prevent unforeseen events and assigned personnel to maintain effective communication with public sector agencies to ensure accurate information can be delivered in crisis situation to those agencies and communities in the area surrounding the company’s production plants. - Participated in activities with relevant government agencies, such as anti-corruption campaigns to promote understanding and reaffirm commitment to maintain transparent and corruption-free working relationship. - Followed up on various measures introduced by the public sector with a view to maintain open lines of communication, high level of preparedness and full compliance. 205 Corporate Governance Policy 56-1 ONE REPORT 2023

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