Exhibit 13.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the annual report on Form 20-F of ASM International N.V. (the “Company”) for the period ended December 31, 2008 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), we, Charles D. del Prado, Chief Executive Officer of the Company, and Arnold J.M. van der Ven, Chief Financial Officer of the Company, each certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that to the best of our knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

By:	/s/ CHARLES D. DEL PRADO
	Charles D. del Prado
	Chief Executive Officer
	March 20, 2009
By:	/s/ ARNOLD J.M. VAN DER VEN
	Arnold J.M. van der Ven
	Chief Financial Officer
	March 20, 2009

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.