Semiconductor manufacturing represents an ongoing pursuit of “ultimate stability”. Processes including wafer processing, inspection, lithography and thin-film measurement often demand positioning accuracy at sub-micron or even nanometer levels. Any minor dimensional drift, vibration disturbance or magnetic interference may lead to reduced wafer yield. In the past, cast iron, aluminum alloy and other metallic materials were widely preferred for equipment frames and reference bases. However, as chip processes keep shrinking, inherent drawbacks of metallic substrates have gradually emerged. For this reason, granite mechanical parts have gained expanding adoption in semiconductor equipment.
Semiconductor production lines operate in complex environments with frequent minor temperature fluctuations. Metallic materials have relatively high thermal expansion coefficients. Heat generated during equipment operation and ambient temperature variations will cause slight expansion and contraction, directly altering the relative positions of motion axes. Premium industrial granite delivers excellent thermal stability, with minimal dimensional change caused by temperature shifts, enabling long-term retention of the benchmark geometry. For core load-bearing components such as wafer inspection platforms and XY linear motor stages, a stable and unchanging benchmark serves as the foundation for consistent repeat positioning accuracy. This is the primary consideration for semiconductor manufacturers choosing granite.
Wafer processing and inspection stations are extremely sensitive to micro-vibrations. High-speed reciprocation of internal linear motors and start-stop cycles of transmission assemblies in semiconductor equipment continuously generate high-frequency micro-vibrations. Metal frames readily conduct and amplify vibrations and may even trigger resonance, distorting signals captured by optical lenses and detection sensors. Thanks to the natural high-damping property of its crystalline structure, granite rapidly dissipates vibration energy and restricts vibration transmission. When applied as equipment bases, gantry beams and substrates for air-bearing platforms, granite directly reduces jitter transferred to the wafer working surface and ensures reliable optical imaging and precision positioning.
Non-magnetic performance and contamination resistance are also essential requirements for semiconductor cleanrooms. Metallic components can create magnetic fields that interfere with optical scales, magnetic rulers and various precision sensors and disrupt signal reading. Steel also carries the risk of rusting; tiny rust particles entering clean chambers become fatal contaminants and induce defects on wafer surfaces. Granite is inherently non-magnetic and produces no electromagnetic interference. Featuring chemically stable properties, it resists oxidation and rust and will not generate metallic dust in cleanrooms, complying with strict particle control standards of semiconductor production lines. 
Many large semiconductor inspection devices require integrated, large-size benchmark structures. Large traditional metal parts are cast in segments and then assembled. Joint seams introduce sectional errors, and connection points tend to deform as stress releases over long-term service. High-grade raw granite blocks can be machined into monolithic oversized components to eliminate splicing structures and reduce cumulative errors introduced during assembly. With large-scale machining capacity, ZHHIMG manufactures large-span integrated granite bases, gantries and air-bearing substrates to satisfy the overall structural design of large wafer inspection, AOI and X-ray inspection equipment.
Material selection still requires case-by-case evaluation. Granite has brittleness limitations, so support points must be rationally designed to avoid single-point impact loads. In addition, raw materials vary greatly in quality. Low-cost stone or marble cannot meet the requirements of long-term high-precision operation for semiconductor equipment. Only high-density black granite that undergoes strict screening and sufficient aging treatment can satisfy stringent standards for non-stop production in cleanrooms.
As chip processes continue to advance, equipment requirements for benchmark stability, vibration control and cleanliness will grow more stringent. It is difficult for metallic materials to simultaneously achieve low thermal deformation, vibration suppression, non-magnetic performance and low particle emission. Granite mechanical parts combine all these advantages, which explains why a growing number of semiconductor equipment manufacturers select granite components for core benchmark positions.
Post time: Sep-14-2026