Requirements for the specification of high expansion foam liquid are
outlined. These include certain physical properties of the liquid itself,
and the properties of the foam which the liquid is capable of making. It
is important in devising tests for these properties and specifying
acceptance criteria that more information is obtained on the performance
of high expansion foam against fire, and certain fire performance tests
are suggested for this purpose. Certain properties of the foam can only
be conveniently measured when the foam liquid is used in conjunction with
the foam making apparatus in which it is to be employed.
An indication is given on the extent to which a specification can be
made at the present time to cover the stated requirements.
