TIA ANSI/TIA-455-39-B

This procedure is generally not intended for use on cables containing water swellable tapes, powders, or yarns. Swellable materials must absorb water in order to swell and build a block to further penetration of water. This test method may be used to look at the water wicking characteristics of such cables, however it must be understood that a certain amount of water absorption is necessary for such cables to pass water penetration requirements.