Particle generation and ball material

Particle count rises with ball material and lubrication. Stainless steel balls in stainless housings with a thin, compatible lubricant film give the lowest measurable shed in most Class 1000–10000 areas. Nylon balls reduce metal-to-metal contact and noise but wear faster; check the wear rate against your cleaning cycle before specifying them.

ESD-safe and non-marking movement

Where static-sensitive devices are handled, confirm the ball path is grounded through the housing and frame. Conductive or dissipative ball options exist; specify the surface resistance your process requires. Non-marking balls protect glass, wafers and coated panels from scuffing at transfer corners, where sliding contact is highest.

Mounting, load and maintenance

Four-hole flange mounting gives a flat, gasket-friendly seat on cleanroom benches and mini-environments. Load per ball is usually modest, 20–100 kg, so ball size is driven by gap and surface, not strength. Replace worn transfer balls on a scheduled interval rather than waiting for noise, because a dry ball sheds particles before it seizes.

Our ball roller units & conveyor ball mats

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FAQ

Which ball size suits wafer carriers?

48 mm balls are usual for wafer carriers and small cassettes. Use 60 mm where carriers are wider or heavier.

Do I need sealed housings in a cleanroom?

Sealed housings reduce lubricant escape but trap wear debris. Choose drainable, cleanable units if you wipe down regularly.

Can ball rollers be grounded for ESD?

Yes, with a conductive ball and housing path to the frame. Specify the target resistance for your process.