1. J. F. Watts and J. E. Castle, J. Mater. Sci. 19 (1984) 2259.
2. D. Gray, W. H. Lunn and O. McArdle, Maters. Perf. 22 (7) (1984) 4.
3. D. Gray, Private communication (1981).
4. Mobilox?, ?Fusion Bonded Pipe Coatings?, P.P.C. Application Guide, AG-5-1980C (1980) p. 6.
5. British Gas Corporation, Specification PS/CW6.