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ESD Requirements on Machined Semiconductor Hardware

September 21, 2026

Static is one of the few requirements on semiconductor hardware that leaves no visible evidence when it goes wrong. The part looks perfect, the devices fail later and the root cause analysis takes weeks.

When it matters

  • Anything that touches a device or a wafer directly
  • Handling hardware such as nests, pockets, trays and shuttles
  • Fixtures and carriers used on assembly and test floors
  • Tools and surfaces in a static controlled area, where the plant has its own standard

It matters less on structural parts, chamber hardware and anything bolted to a grounded frame with a metal to metal path.

The material and coating options

Option Where it fits Limits
Static dissipative PEI and PEEK grades Nests, guides, device contact parts More expensive, some grades are harder on tools
Carbon filled polymers Structural dissipative parts Can be a particle source if the surface is rough
Conductive coatings on aluminum Large parts where bulk material cannot change Coating wears, needs a defined contact area
Masked anodize with grounded contact Plates and brackets Requires the ground path to be designed, not assumed
Bare or passivated stainless Frames, rails and structure Heavier and still needs a grounding path

Writing a requirement a shop can meet

“ESD safe” is not a specification. A usable one has four parts:

  1. The surface resistance range you require, stated with units
  2. The test method and voltage, referenced to the standard your plant uses
  3. Where on the part the requirement applies, since a masked area behaves differently from a coated one
  4. The grounding path, if the part must be grounded through its mounting

Add when the test is repeated: first article only, per lot, or after any process change.

Practical failures worth designing out

  • An anodized plate assumed to be grounded through its screws, with anodize under every screw head
  • A dissipative nest mounted on an insulating standoff, so charge has nowhere to go
  • A coating specified without a contact area, then worn through at the only point that mattered
  • A material substitution by the shop, from a dissipative grade to a standard one that looks identical

The last one is the most common and the easiest to prevent: require the material certificate with the trade name and grade and check it against the qualification.

Handling hardware brings both ESD and particle requirements at once, which is covered in wafer handling parts and the material behaviour side is in PEEK, Vespel and Torlon.

If you have hardware with an ESD requirement, send the RFQ with the resistance range and the test method in it and we will match shops that can source the qualified grade rather than a lookalike.

Frequently asked questions

Is anodized aluminum ESD safe?

No. Anodize is an insulating oxide layer, which is exactly the opposite of what an ESD control needs. Where an aluminum part must dissipate charge, the contact areas are masked, or a conductive coating or a grounded path is designed in.

What is the difference between conductive, dissipative and insulative?

They are ranges of surface resistance. Conductive is the lowest, dissipative is the middle band that lets charge bleed away in a controlled time and insulative is the highest. Dissipative is what most handling hardware wants, because fully conductive can create its own problems.

Can a supplier test the finished part?

A surface resistance measurement with a standard probe and a stated test voltage is straightforward. Ask for it on the first article and periodically after that, and state the range you accept.

Need a quote for this part?

Send the drawing. We match you with up to 3 shops in Vietnam and reply within 24 business hours.

Get matched with a supplier

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