Acquisition Completed

COOKSON GROUP PLC 16 September 1999 COOKSON ACQUIRES PLASKON ELECTRONIC MATERIALS Cookson Group plc ('Cookson'), the international materials technology group, announces that it has now completed the acquisition of the Plaskon Electronic Materials business of BP Amoco for a cash consideration of US$121 million (£77 million), the terms of which were previously announced on 15 July 1999. For further information, please contact: Stephen Howard Dennis Millard Group Chief Executive Group Finance Director Cookson Group plc Cookson Group plc London WC2N 6HJ London WC2N 6HJ Tel: 0171 766 4500 Tel: 0171 766 4500 Fax: 0171 747 6600 Fax: 0171 747 6600

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