Dionex (DNEX) 10-Q 2003 Q3 Quarterly report

Exhibit 99.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL
OFFICER
PURSUANT TO
18 U.S.C. SECTION 1350
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

          I, Lukas Braunschweiler, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report of Dionex Corporation on Form 10-Q for the quarter ended March 31, 2003 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Quarter Report fairly presents in all material respects the financial condition and results of operations of Dionex Corporation.

By:	/s/ Lukas Braunschweiler
	Name:     Lukas Braunschweiler

Title: President, Chief Executive Officer and Director

          I, Craig A. McCollam, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report of Dionex Corporation on Form 10-Q for the quarter ended March 31, 2003 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Quarter Report fairly presents in all material respects the financial condition and results of operations of Dionex Corporation.

By:	/s/ Craig A. McCollam
Name:	Craig A. McCollam

Title: Vice President and
Chief Financial Officer