(Owen etal. continued from p. 269)

J.H. Saunders and R.H. Hansen , Chapter 2 "Plastics Foams" edited by K. C. Frisch and J. H. Saunders , Marcel Dekker Inc. New York (1972 ), p. 24.

See for example

Reference 1 pps. 83-85.

B. Kanner and B. Prokai , Adv. Urethane Sci. Technol. Vol 2 ( 1973), pps. 221-240.

C.J. Benning . Chapter 2, "Plastics Foams" Wiley-Interscience, New York (1969 ).

E.G. Schwarz , Applied Polymer Symposia 14, 71 (1970).

B. Kanner and T.G. Decker , J. Cellular Plastics 5, 32 (1969).

M.J. Owen and T.C. Kendrick , J. Colloid Interface Sci. 27, 46 (1968).

M.J. Owen T.C. Kendrick , B.M. Kingston and N.C. Lloyd , J. Colloid Interface Sci. 24, 141 (1967).