Report the additional details of the issuance of debenture

-translation- 1000/ 140 /2006 May 16, 2006 Subject To report the details of the debenture To President of the Stock Exchange of Thailand Pursuant to the resolution of the Extraordinary General Meeting the Bangchak Petroleum Public Company Limited ("the Company") No. 1/2005 on October 11,2005, which approved the issuance of the convertible debenture, the terms of such convertible debenture as disclosed in Disclosure of Connected Transaction to SET on August 29, 2006. The company would like to provide detailed information of the convertible debenture as follows; 1. Type of Security Convertible and Subordinated Debenture of The Bangchak Petroleum Public Company Limited No. 1/2006 due 2016 or "the Debenture" 2. Type of the Debenture Subordinated, unsecured, and non-transferable Debenture, which can be converted to ordinary shares 3. Number of the Issued Debenture 58,560 Units 4. Par Value 10,000 Baht per Unit 5. Issued Price 10,000 Baht per Unit 6. Offered to PTT Public Co., Ltd. 7. Subscription and Payment Date May 16, 2006 8. Approval from the Regulators the Company has received approval from The Securities and Exchange Commission,Thailand ("SEC") on May 10,2006 9. Total Amount of Fund from the Issuance 585,600,000 Baht 10.Use of Fund from the Debenture Issuance For Product Quality Improvement Project or "PQI Project" 11. Debenture Details *Interest Rate 3% per annum *Interest Payment Date every January 31 and July 31 throughout the life of debenture with the initial interest payment on July 31, 2006 *Maturity 10 Years *Issuance Date May 16,2006 *Maturity Date May 15,2016 *Conversion Price Equivalent to 14 Baht per share except for subsequent adjustment of the conversion price according to the terms and conditions of the Debenture *Security - None - *Redemption The Debenture will be redeemed by converting into ordinary shares on May 15, 2016 or the next working business day if May 15, 2006 is not a regular working business day. *Call Option - None - *Credit Rating Result - None - *Credit Rating Agency - None - 12. Secondary Market - None - Please be informed accordingly, Yours sincerely, -Signed- (Anusorn Sangnimnuan) President Corporate Planning and Investor Relation Office Tel : 0-2335-4583