EXHIBIT 99.2 CERTIFICATION PURSUANT TO SECTION 1350, CHAPTER 63 OF TITLE 18, UNITED STATES CODE, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 Pursuant to Section 1350, Chapter 63 of Title 18, United States Code, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, the undersigned, as Vice President, Corporate Controller and Chief Accounting Officer of BTU International, Inc. (the "Company"), does hereby certify that to his knowledge: 3) the Company's Annual Report on Form 10-K for the period ended December 31, 2002 (the "Report") fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and 4) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. /s/ THOMAS P. KEALY --------------------------------------- Thomas P. Kealy Vice President, Corporate Controller And Chief Accounting Officer (principal Financial and accounting officer) Dated: March 31, 2003