Disposal

Cookson Group PLC
02 February 2007



                 COMPLETION OF MONOFRAX SALE FOR US$45 MILLION



Further to its press release of 19 December 2006, Cookson Group plc ('Cookson'),
a leading materials science company, confirms that on 1 February 2007 it
completed the sale of the business and assets of Monofrax Inc. ('Monofrax').



Monofrax, a US-based fused cast refractories business which formed a separate
part of the Ceramics division, was sold to RHI AG ('RHI') for US$45m (£23
million*).  The purchase price was satisfied by an assumption by RHI of pension,
retirement medical and other liabilities of US$10 million (£5 million*) with the
balance satisfied by cash of US$35 million (£18 million*).





Notes:



* translated at an exchange rate of US$1.97/£1



For further information please contact:
Shareholder/analyst enquiries:
Nick Salmon, Chief Executive                            Cookson Group plc
Mike Butterworth, Group Finance Director                Tel: [phone]
Isabel Luetgendorf, Investor Relations Manager

Media enquiries:
John Olsen                                              Hogarth Partnership
                                                        Tel: [phone]



About Cookson Group plc

Cookson Group plc is a leading materials science company operating on a
worldwide basis in Ceramics, Electronics and Precious Metals markets.



The Ceramics division is the world leader in the supply of advanced flow control
refractory products and systems to the global steel industry and a leading
supplier of specialist ceramic products to the glass and foundry industries. It
is also the regional leader in the US, UK and Australia in the supply and
installation of monolithic refractory linings.



The Electronics division is a leading supplier of advanced surface treatment and
plating chemicals and assembly materials to the automotive, construction and
electronics markets.



The Precious Metals division is the leading supplier of fabricated precious
metals (gold, silver, platinum, etc.) to the jewellery industry in the US, the
UK, France and Spain. Products include alloy materials, semi-finished jewellery
components and finished jewellery.


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            The company news service from the London Stock Exchange