NV Umicore SA/Fi – Underwriting Agreements Watch

from SC 13D/A 1 page Joint Filing Agreement the Undersigned Hereby Agree as Follows: (I) Each of Them Agrees That the Amendment No. 3 to Schedule 13d to Which This Agreement Is Attached as an Exhibit Is Filed on Behalf of Each of Them. (II) Each of Them Is Responsible for the Timely Filing of Such Amendment No. 3 to Schedule 13d and Any Amendments Thereto, and for the Completeness and Accuracy of the Information Concerning Such Person Contained Therein; but Neither of Them Is Responsible for the Completeness or Accuracy of the Information Concerning the Other Persons Making the Filing, Unless Such Person Knows or Has Reason to Believe That Such Information Is Inaccurate. Dated: June 20, 2000 N.V. Union Miniere S.A. /S/ Thomas Leysen Thomas Leysen Chief Executive Officer Dated: June 20, 2000 Union Miniere USA Inc. /S/ Richard C. Laird Richard C. Laird Executive Vice President

from SC 13D/A 1 page Exhibit 1 Joint Filing Agreement the Undersigned Hereby Agree as Follows: (I) Each of Them Agrees That the Amendment No. 2 to Schedule 13d to Which This Agreement Is Attached as an Exhibit Is Filed on Behalf of Each of Them. (II) Each of Them Is Responsible for the Timely Filing of Such Amendment No. 2 to Schedule 13d and Any Amendments Thereto, and for the Completeness and Accuracy of the Information Concerning Such Person Contained Therein; but Neither of Them Is Responsible for the Completeness or Accuracy of the Information Concerning the Other Persons Making the Filing, Unless Such Person Knows or Has Reason to Believe That Such Information Is Inaccurate. Dated: June 1, 2000 N.V. Union Miniere S.A. /S/ Thomas Leysen Thomas Leysen Chief Executive Officer Dated: June 1, 2000 Union Miniere USA Inc. /S/ Richard C. Laird Richard C. Laird Executive Vice President

from SC 13D/A 1 page Page 14 of 14 Pages Exhibit 1 Joint Filing Agreement the Undersigned Hereby Agree as Follows: (I) Each of Them Agrees That the Amendment No. 1 to Schedule 13d to Which This Agreement Is Attached as an Exhibit Is Filed on Behalf of Each of Them. (II) Each of Them Is Responsible for the Timely Filing of Such Amendment No. 1 to Schedule 13d and Any Amendments Thereto, and for the Completeness and Accuracy of the Information Concerning Such Person Contained Therein; but Neither of Them Is Responsible for the Completeness or Accuracy of the Information Concerning the Other Persons Making the Filing, Unless Such Person Knows or Has Reason to Believe That Such Information Is Inaccurate. Dated: April 7, 2000 N.V. Union Miniere S.A. /S/ Thomas Leysen Name: Thomas Leysen Title: Executive Vice President Dated: April 7, 2000 Union Miniere USA Inc. /S/ Richard C. Laird Richard C. Laird Executive Vice President

from SC 13D 1 page Exhibit 1 Joint Filing Agreement the Undersigned Hereby Agree as Follows: (I) Each of Them Agrees That the Schedule 13d to Which This Agreement Is Attached as an Exhibit Is Filed on Behalf of Each of Them. (II) Each of Them Is Responsible for the Timely Filing of Such Schedule 13d and Any Amendments Thereto, and for the Completeness and Accuracy of the Information Concerning Such Person Contained Therein; but Neither of Them Is Responsible for the Completeness or Accuracy of the Information Concerning the Other Persons Making the Filing, Unless Such Person Knows or Has Reason to Believe That Such Information Is Inaccurate. Dated: October 6, 1999 N.V. Union Miniere S.A. /S/ Thomas Leysen Name: Thomas Leysen Title: Executive Vice President Dated: October 5, 1999 Union Miniere Inc. /S/ Richard C. Laird Richard C. Laird Executive Vice President