Migration is the movement of non-resinous plasticizers within vinyl at elevated or lowered temperatures, which can contaminate adjacent materials and change electrical characteristics.
Migration occurs when the non-resinous plasticizers that keep a vinyl compound flexible move out of it under elevated or lowered temperatures. As these plasticizers migrate, they can travel into adjacent materials within a cable. For example, plasticizer migrating from a vinyl jacket can contaminate the polyethylene core of a coaxial cable, altering its electrical characteristics over time.
Because the electrical performance of a cable depends on the stability of its materials, plasticizer migration is an important consideration in construction. When a jacket and an insulation are in contact, the compounds are chosen for compatibility so that migration does not degrade the dielectric or change the cable's impedance and loss characteristics during service.
In commercial and industrial applications, controlling migration helps preserve the long-term performance of cable, particularly in signal and communication products where electrical stability is critical. Non-contaminating compounds and compatible material pairings are used specifically to prevent the kind of contamination that migration can cause.
Because the stability of a cable's materials underpins its electrical performance, preventing migration through compatible compounds is a deliberate design choice, particularly in signal cable where a shift in characteristics would degrade the result.
At Windy City Wire, an understanding of material behavior such as plasticizer migration supports the selection of low-voltage cable engineered for lasting performance. Recognizing how compatible materials prevent contamination helps customers appreciate the construction details that keep signal and communication cable stable over time.