| COOPER, Stephen Richard ACTIVE | Director | 12 Jun 2014 | | England | December 1966 | Anglia House 6, Central Avenue, St Andrews Business Park, Norwich, NR7 0HR |
| DE TURRIS, Atillia Gabriella RESIGNED | Secretary | 29 Mar 1996 | 06 Feb 1998 | | | 8 Vineyard Mews, Preston Place, Richmond Upon Thames, Surrey, TW10 6DD |
| DONALD, Keith Malcolm Hamilton RESIGNED | Secretary | 10 Mar 1995 | 30 Nov 1995 | | | 251 Upper Richmond Road, London, SW15 6SW |
| GOULDING, Graham Thomas RESIGNED | Secretary | 12 Jun 1998 | 25 Apr 2003 | | | 126 Auckland Road, London, SE19 2RP |
| MCMILLAN, Kenneth Hutchison RESIGNED | Secretary | | 10 Mar 1995 | | | 12 Androvan Court, Cyncoed, Cardiff, South Glamorgan, CF2 6TF |
| OAKES, Paul Harry RESIGNED | Secretary | 06 Jun 2003 | 30 Jun 2018 | | | Harsco House, Regent Park, 299 Kingston Road Leatherhead, Surrey, KT22 7SG |
| PRICHARD, Teresa Joan RESIGNED | Secretary | 06 Feb 1998 | 12 Jun 1998 | | | 4 Bracken Gardens, Barnes, London, SW13 9HW |
| AYARS, Raymond Donald RESIGNED | Director | | 10 Mar 1995 | | September 1938 | 349 North Mckean Street, Butler, Pa 16001, FOREIGN, Usa |
| BRICK, Leroy William RESIGNED | Director | | 30 Jun 1993 | | October 1927 | 802 Mandy Lane, Camp Hill, Pa 17001, FOREIGN, Usa |
| BUTLER, Geoffrey Doy Hopson RESIGNED | Director | 30 Apr 1997 | 31 Dec 2010 | England | October 1946 | Home Green Heath House Road, Worplesdon Hill, Woking, Surrey, GU22 0QU |
| CAMPANARO, Leonard Anthony RESIGNED | Director | 30 Jun 1993 | 30 Mar 1995 | | May 1948 | 1704 Olmstead Way East, Camp Hill, Pennsylvania, 17011845, Usa |
| CHAPLA, Richard Eugene RESIGNED | Director | | 10 Mar 1995 | | August 1936 | 116 Iroquois Drive, Timberley Heights, Butler, Pa 16001, FOREIGN, Usa |
| CONLEY, Thomas Kevin RESIGNED | Director | | 10 Mar 1995 | | January 1954 | 817 Ledge View Drive, Pittsburgh, Oa 15101, FOREIGN, Usa |
| FAZZOLARI, Salvatore Domenico RESIGNED | Director | 30 Jun 1993 | 30 Mar 1995 | | August 1952 | 83 Fairway Drive, Camp Hill Pennsylvania, 17011 Usa |
| HOAD, Martin Roger Gregory RESIGNED | Director | 10 Dec 2010 | 01 Nov 2011 | United Kingdom | November 1965 | Harsco House, Regent Park, 299 Kingston Road Leatherhead, Surrey, KT22 7SG |
| IMHOF, Robert Albert RESIGNED | Director | | 10 Mar 1995 | | September 1940 | 3929 North Monet Court, Allison Park, Pennsylvania 15101, FOREIGN, Usa |
| JACOBY, Paul Theodore RESIGNED | Director | | 10 Mar 1995 | | July 1942 | 327 Lakewood Drive, Butler, Pennsylvania 16001, FOREIGN, Usa |
| JARVIS, Malcolm RESIGNED | Director | | 30 Apr 1994 | | November 1937 | 83 Castle Lea, Caldicot, Gwent, NP6 4PJ |
| KIRKWOOD, Clyde RESIGNED | Director | 04 Sep 2009 | 10 Dec 2010 | United Kingdom | September 1964 | High Pines, 14 Douglas Grove, Farnham, Surrey, GU10 3HP |
| LECLERCQ, Herve Michal RESIGNED | Director | 03 Oct 2011 | 16 Dec 2013 | United Kingdom | June 1962 | Harsco House, Regent Park, 299 Kingston Road Leatherhead, Surrey, KT22 7SG |
| MELLODEY, Martin John RESIGNED | Director | 10 Mar 1995 | 11 Apr 1997 | | March 1946 | 2 Home Farm, Aldcliffe, Lancaster, Lancashire, LA1 5AX |
| OAKES, Paul Harry RESIGNED | Director | 03 Oct 2011 | 01 Jul 2014 | United Kingdom | November 1957 | Harsco House, Regent Park, 299 Kingston Road Leatherhead, Surrey, KT22 7SG |
| PESCI, Donald Charles RESIGNED | Director | | 10 Mar 1995 | | August 1932 | 112 Shanahan Road, Butler, Pa 16001, FOREIGN, Usa |
| REITEMEIER, Christophe Nicolas RESIGNED | Director | 06 Nov 2020 | 21 Jul 2022 | England | December 1965 | Carlton House, Regent Park, 299 Kingston Road, Leatherhead, Surrey, KT22 7SG, England |
| REZICH, George Francis RESIGNED | Director | | 30 Jun 1993 | | June 1927 | 807 Riverview Road, Lemoyne, Pa 17043, FOREIGN, Usa |
| STUBBS, Graham Martin RESIGNED | Director | 10 Dec 2010 | 01 Jul 2014 | United Kingdom | February 1954 | Harsco House, Regent Park, 299 Kingston Road Leatherhead, Surrey, KT22 7SG |
| UNDERWOOD, Eric RESIGNED | Director | 30 Apr 1997 | 24 Aug 2009 | | April 1945 | 11 Beech Avenue, Rotherham, South Yorkshire, S65 3HN |
| WARD, Thomas Rowland RESIGNED | Director | 12 May 1995 | 28 Mar 2002 | | March 1950 | 5 Silver Birch Close, Caerleon, Newport, Gwent, NP6 1RX |
| WHISTLER, Christopher Claude Lashmer RESIGNED | Director | 10 Dec 2010 | 31 Dec 2020 | England | June 1958 | Harsco House, Regent Park, 299 Kingston Road Leatherhead, Surrey, KT22 7SG |