Report of Operating Performance

THIP-SET 031/2005 May 13th, 2005 Subject :Filing of Verified Financial Statements for the 1st Quarter of 2005 and 2004 and Report on Comparative Operating Performance between the 1st Quarter Attention :Director and Manager, SET Enclosures :Verified Financial Statements and the Report of C.P.A.for the 1st Quarter of 2005 and 2004, 2 copies (1 Thai and 1 English versions) Referring to SET regulations concerning Criteria,Conditions and Methods of Preparation,Filing,and Reporting on Financial Status and Business Performance of Listed Companies dated May 19,1993 requiring the company's clarification on causes contributing to changes over 20 percent of business performances from the previous operating period accordingly,Thantawan Industry Public Co.,Ltd.(THIP) would like to indicate the major causes for significant changes of business performances in the 1st Quarter of 2005 as compared with the same Quarter in 2004 as following : The company's net profit had increased 12.32 million baht from 4.77 million baht net loss in 1st Quarter of 2004 by following causes: 1.1 Sales revenue had increased 56.78 million baht or changes over 37.46% from 151.58 million baht sales revenue in 1st Quarter of 2004 to 208.36 million baht sales revenue in the same period in 2005. 1.2 Other revenues had increased 2.45 million baht or changes over 39.90% from 6.14 million baht other revenues in 1st Quarter of 2004 to 8.59 million baht other revenues in the same period in 2005. Please be informed accordingly. Very truly yours, (Mrs.Pojanard Phanaskhao)(Mr.Phietoon Trivijitkasem) Authorized Director