Zinc whiskers are microscopically thin, conductive zinc crystals that grow spontaneously on electroplated steel. That steel runs throughout a data centre, from the raised-floor substructure to the cable trays, mounting rails and cabinet frames fitted during construction and fit-out. Once dislodged, the crystals cause sudden, hard-to-diagnose failures.
What they are
They are hair-thin crystals of zinc, up to a few millimetres long, that grow spontaneously on electroplated zinc steel. Classic sources are the underside of raised-floor panels, cable trays, pedestals and the mounting hardware used when the hall was built and the cabinets were installed.
Why they are dangerous
Once disturbed, by moving tiles or by airflow, they break loose, become airborne and enter equipment through the cooling path. Because they are conductive, they cause short circuits and intermittent failures that are extremely hard to trace.
A slow-building problem
Whiskers grow over years; problems often surface only once a raised floor is five to ten years old or more. They form on electroplated (not hot-dip galvanised) steel under mechanical stress.
The wrong cleaning makes it worse
An ordinary vacuum without true HEPA filtration lifts whiskers and blows them back out, increasing the airborne load rather than reducing it. Correct handling requires HEPA 14 filtration, ESD-safe working, and flagging shedding tiles for replacement.
Key takeaways
- Conductive metal filaments from zinc-plated steel.
- They cause intermittent short circuits.
- Often surface only after 5–10 years.
- Mitigation: HEPA cleaning plus replacing the source.