Ask any semiconductor equipment engineer what keeps them awake, and the answer is rarely the motion system or the optics. It is the floor the machine stands on. A wafer stage that holds 2 nanometres of position on paper still needs a base that will not drift, ring, or warm up under it.
That base is usually black granite. Not because granite is fashionable, but because it does three things at once that no metal does: it stays put when the temperature moves, it swallows vibration instead of passing it on, and it does not rust or creep over a decade of 24/7 running. This is the part of the tool that ZHHIMG builds.
A large black granite plate being checked at the ZHHIMG plant — flatness is proven with instruments, not promises.
The Problem Is Stability, Not Strength
Semiconductor equipment is not heavy because it needs strength. It is heavy because it needs stability. The tool has to hold its geometry while motors move, while the room warms and cools, and while it runs for months without a pause.
Steel and cast iron move with temperature. They also ring. In a tool that measures features smaller than a virus, a base that rings is a base that fails. The goal is a surface that stays a reference surface all year, not just on the day of installation.
Why Black Granite Wins
Our black granite runs at a density of roughly 3,100 kg/m³. High density means low porosity. Low porosity means the stone does not absorb moisture, does not swell in humid cleanrooms, and does not shift as the seasons change.
Three more properties matter just as much. Granite has low thermal expansion, so a temperature swing moves it far less than metal. It has high internal damping, so vibration turns into heat instead of travelling to the wafer. And it is non-magnetic and non-rusting, so it will not disturb sensors or shed corrosion over time. For a tool that must hold nanometres, that is the whole game.
Where Granite Sits in a Semiconductor Tool
We supply granite for the parts of the tool where accuracy is decided. That includes wafer inspection and metrology stages, lithography and laser platforms, bonding and packaging equipment, CMP and planarisation frames, and the granite gantry systems that carry optics and probes across the workpiece.
The same material also underpins machine bases for PCB drilling, optical inspection, and precision assembly. Different tools, same requirement: a reference that does not argue with the measurement.
The Details That Decide a Wafer Stage
A block of granite is not a component. What makes it one is the work around it. We machine threaded inserts, vacuum channels, air-bearing pockets, cable routes and mounting planes into the stone, then hold the geometry between them to the drawing.
Holes and inserts are set so the stage, the optics and the travel rails align without shimming on site. That is the difference between a slab and a precision granite component — and it is why equipment builders send us the interface drawing, not just the outer dimensions.
The Hand That Reads a Micron
Flatness on a granite plate is still finished by hand. Our master hand-lappers have worked the bench for up to thirty years. They can feel a high spot at the micron level, long before the instrument is called in to confirm it.
We treat that skill as a starting point, not a certificate. The hand proposes; the instrument disposes. Every critical surface is then measured on our inspection line, which runs on equipment from Mahr (Germany), WYLER (Switzerland) and Renishaw (UK). Nothing ships until the numbers match the drawing.
Certified, Patented, and Built to Be Audited
ZHHIMG is the only company in the sector that holds ISO 9001, ISO 45001, ISO 14001 and CE certification at the same time, backed by more than 20 international patents. Semiconductor customers audit hard, and we would rather they check everything.
Our precision granite is used by companies such as GE, Samsung and Oracle, and researched with institutions including the National University of Singapore and national metrology institutes in the UK, Germany and the US. When a national metrology lab measures the material, the tolerance is a measured fact, not a marketing number. No cheating, no concealment, no misleading — that is how we work.
Why Builders Keep Coming Back
When a semiconductor tool ships, the base is the part nobody re-specifies. It works, or the whole machine is scrap. Builders come back to ZHHIMG because the numbers hold, the finish holds, and the geometry holds across the life of the platform.
If you are designing a stage, a gantry or a machine base, send us the accuracy budget, the load, and the environment. Our engineers will match the granite grade, thickness and insert layout to the job — and give you the measurement data to prove it. Explore our ultra-high-precision granite solutions to start.
Post time: Sep-17-2026