RPC/HO-SET/ELCID-021/05 November 30, 2005 Subject Resolutions of the exercise of warrant (ESOP) - Revised To President The Stock Exchange of Thailand We would like to revised the number of the exercised warrant as follow: According to Rayong Purifier Public Co., Ltd. or RPC issued and offered 8,490,000 units of RPC s warrants to directors, advisor, management and employee, exercise ratio one warrant per one ordinary share, 1.00 Baht pare value, on August 31, 2005. The Company had determined the 1/3 exercise, 2,830,108 units, on November 30, 2005 and please to inform the resolution as follows: Number of the exercised persons 309 Persons Number of the exercised warrant 2,822,686 Units Number of the ordinary shares from exercised 2,822,686 Shares Remaining of warrant 7,422 Units Remaining of the reserve ordinary shares 7,422 Shares Please be so informed. Sincerely Yours, Ms.Siraporn Krishnakan Assistant to Managing Director Investor Relations / Managing Director Office Tel 0 2515-8671 E-mail:ir@rpcthai.com