Disposal of Poly-Flex Completed

Cookson Group PLC 7 March 2000 COOKSON SELLS POLY-FLEX BUSINESS Cookson Group plc ('Cookson'), the international materials technology group, announces that it has now completed the sale of its Poly-Flex business to Parlex Corporation (NASDAQ: PRLX) for a cash consideration of US$19.6 million (£12.5 million), terms of which were previously announced on 25 January. 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: 020 7766 4500 Tel: 020 7766 4500 Fax: 020 7747 6600 Fax: 020 7747 6600

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