SUSTAINABILITY REPORT ASSURANCE STATEMENT

Members of Senior Management and other stakeholders of Oxiteno

Introduction

Green Domus Desenvolvimento Sustentável (Green Domus) was hired by Oxiteno to assure its Sustainability Report for 2017. Oxiteno was responsible for preparing and presenting the information on its sustainability performance in its 2017 Sustainability Report, as well as presenting the evidence necessary for the assurance procedures; while Green Domus proceeded with the independent assurance in a systematic and documented manner, based on the required evidence produced by Oxiteno.

Assurance Standards

The assurance process was conducted based on the AA1000 Assurance Standard 2008; AA1000 Accountability Principles Standard 2008 and on the Guidelines for Sustainability Report, version G4, 2013, of the Global Reporting Initiative (GRI).

Assurance Level and Type

The assurance conducted by Green Domus was moderate and of type 1, according to the concepts defined by AA1000 Assurance Standard 2008; thus, it was verified the adhesion to the Principles of Inclusion, Materiality and Capacity of Response, and how the organization communicates this performance on the sustainability report; the presentation of the information requested in the essential “agreed” option defined by GRI and following the criteria to define the content and quality assurance of the report.

Assurance Limits

The assurance was limited to the evaluation of the preliminary information in the 2017 Sustainability Report of Oxiteno and the other evidence that based its content.

Methodology

The assurance began with the preliminary evaluation of the information in the 2017 Sustainability Report of Oxiteno and in the documents that based its preparation. A visit was made to the centralizing unit of the information used in the sustainability report, aiming at interviewing the stakeholders involved and gathering evidence of the reported information.

Through the Assurance Protocol, adjustments to the information presented in the report were requested, and improvements were suggested for adequacy to the assurance standards used. The assurance procedures were finalized only after the completion of the indications made.

Independence and Impartiality

For the assurance purposes, Green Domus states that it has no relationship with Oxiteno that might prevent it from issuing this Assurance Statement in an independent and impartial manner. It should also be noted that all professionals involved in this assurance process are aware of and trained in Green Domus's Corporate Management System, whose content includes policies and procedures that set a neutral operation pattern for and mitigate possible technical risks in the development of the company's activities.

Comments and Recommendations

Without interfering in the positive conclusion of this assurance, Green Domus recommends some improvements and the adoption of good practices for Oxiteno's report:

• Redo and/or update the company's materiality to ensure its adhesion to the reality of the sector and a closer relationship with its stakeholders.
• Adapt, in the next report cycles, the development process of the sustainability report to observe the version of GRI Standards.
• Expand the description of the management of the reported relevant topics to implement the recommendations of the GRI Guidelines and move towards the compliance with the requirements of GRI Standards.
• Deepen the management of quantitative data of the reported indicators, in order to increase the capacity to respond to the relevant issues of the organization.

Conclusions

In the opinion of Green Domus Desenvolvimento Sustentável, the 2017 Sustainability Report of Oxiteno is an adequate representation of the company, which relates its strategies, policies, and actions to its sustainability performance. Based on the procedures performed, it can be affirmed that nothing came to Green Domus's knowledge that would lead it to believe that the information contained in the 2017 Sustainability Report of Oxiteno was not compiled, in all material respects, in accordance with the Guidelines for GRI Sustainability Report, version G4, related to the Essential “agreed" option, with the 2008 AA1000 AccountAbility Principles Standard, and with the organizational guidelines that based its preparation.

São Paulo, November 1, 2018

Nino Sergio Bottini
Independent Reviewer

Marina Dall’Anese
Lead Auditor