| http://www.w3.org/ns/prov#value | - In the syntactic foam composition, it is preferred to use an admixture of polysiloxanes of the formulae: ##EQU6## wherein R5 and R6 are alkyl, aryl, haloalkyl, haloaryl, alkaryl, aralkyl, alkenyl, haloalkenyl, cyanoalkyl, cycloalkyl or cycloalkenyl, and n is a number sufficiently high to provide a fluid viscosity of at least about 400 centipoises.
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