[Translation] Ref.PDI.B.02.71/1998 24 July, 1998 To: President The Stock Exchange of Thailand Re: Temporary shutdown of calcine plant for annual maintenance We would like to inform the SET that our calcine plant at Padaeng Industrial Estate in Rayong province is scheduled to shut down temporarily for an annual maintenance during 26 July-6 August 1998. The 12-day operation closure will not affect PDI's initially planned production and sales in 1998. Yours truly, (Signed) Arsa Sarasin (Mr. Arsa Sarasin) Executive Chairman & CEO