Date : 06/06/2003 08:40 PDI : PDI AWARDED ISO/IEC 17025 CERTIFICATE [Translation] Ref. PDI/BK-BS-040/2003 5 June 2003 To : President The Stock Exchange of Thailand Re. : Press release on Padaeng awarded ISO/IEC 17025 Certificate for zinc metal quality testing Padaeng Industry Public Company Limited was awarded ISO/IEC 17025 Certificate for zinc metal quality testing as appeared in a press release for media on 5 June 2003 is attached herewith for the SET's information Please be notified accordingly. Yours truly, - Signature - (Pinit Vongmasa) Chief Executive Officer Board Secretary Division Tel. 02 661 9900 Ext. 1501, 1402 Fax 02 661 9946 Press Release For further information Padaeng Industry Public Company Limited Chitchai Thaveepanich June 5, 2003 Tel. 0-2661-9900 ext. 2002 Padaeng awarded ISO/IEC 17025 Certificate for zinc metal quality testing Padaeng Industry Public Company Limited was awarded certification for excellence in operations at the Tak Smelter, for zinc metal and zinc alloy quality testing, in accordance to standards of ISO/IEC 17025 : 1999, by the Thai Industrial Standards Institute. Ongoing efforts have been made to improve and develop the operations room procedures to meet international quality standards in order for our customers to have confidence in the quality testing of our products. It is the specific standard of ISO/IEC 17025 : 1999 that certifies the testing process by examining the accuracy of various aparatus which must meet standardized requirements and procedures even more stringent than those of ISO 9001 : 2000. Having received this distinction will give our customers added reliance in the accuracy of quality analysis of our products and is another testiment to our success in the area of quality, in addition to strict adherence to specification standards of ISO 9001 : 2000, which the company previously received certification. Padaeng Industry Public Company Limited is the sole zinc mining and smelting company in Southeast Asia, with an annual production capacity of 105,000 metric tons. ------------------------------------------------------------------------ Page 1 of 2