UNOFFICIAL TRANSLATION Certification and Consensus of Audit Firm Date ........ Month ....................... Year ............... Dear Secretary-General of the Office of the Securities and Exchange

(UNOFFICIAL TRANSLATION) (Updated 2015) 4. Certification of Leader of Audit Firm Date ........ Month ............ Year.......... To: Secretary-General Office of the Securities and Exchange Commission

แบบแสดงราการข้อมูลประจำปี UNOFFICIAL TRANSLATION Notification of the Change of Audit Firm Date ....... Month ............ Year ....…. Dear Secretary-General of the Office of the Securities and

2016, mainly due to higher selling price of all products, especially on PVC and Caustic Soda according to higher production cost of Chinese PVC suppliers and limited PVC and Caustic Soda export volume

แบบแสดงราการข้อมูลประจำปี (UNOFFICIAL TRANSLATION) (Revision 2015) 8. Audit Firm Profile and Details Name of Audit Firm................................. For the year ending

, particularly PVC, Caustic Soda and ECH, according to the market price trends caused by limited supply from China. The sales volumes also increased for all products, mainly as a consequence of higher Caustic Soda

แบบแสดงราการข้อมูลประจำปี (UNOFFICIAL TRANSLATION) (Updated 2015) 5. Submission Letter of Evidentiary Documentation of Audit Firm Date ........ Month ............. Year.......... To: Secretary

……................ working for ……..(NAME OF AUDIT FIRM)......, wish to apply for an approval of the SEC Office to be an auditor of businesses under the Securities and Exchange Act B.E. 2535 (1992) and the Trust for

which 19,946 MTHB earned from sales revenue. The sales revenue increased by 665 MTHB or 3% comparing to the year 2017. The increment mostly derived from improved Epichlorohydrin (“ECH”) and Caustic Soda

overall selling price decrease, especially for Caustic Soda due to the fall of its market price trend, plus impact from appreciation of Thai Baht against US Dollar. However, those negative impacts were