This test measures the cold flow (creep) behavior of wire insulation material under sustained compressive load as specified in BSS7324. The specimen is subjected to a constant force at a specified temperature for a defined duration, and the resulting deformation is measured.
Cold flow is the tendency of insulation materials to permanently deform under sustained pressure, which can lead to reduced wall thickness and compromised dielectric performance. This property is particularly important for wire and cable installed in tightly bundled configurations.