The delivery of an ultra-precision granite machine base from ZHONGHUI Group (ZHHIMG) is the final step in a meticulous, multi-stage manufacturing process. While the surface of a ZHHIMG® Black Granite base—hand-lapped by our masters to nanometer-level flatness—appears ready for immediate integration, our customers will notice a thin, deliberate application of oil coating the surface upon arrival. This is not incidental; it is a critical, professional measure rooted in materials science and our unwavering commitment to preserving the component’s certified dimensional accuracy through global logistics.
This practice addresses two primary factors that can compromise micro-precision surfaces during transit: environmental protection and micro-porosity sealing.
The Science Behind the Oil Layer
High-density granite, such as our proprietary ZHHIMG® Black Granite (density ≈ 3100 kg/m³), is prized for its extremely low porosity. However, even the most inert stone possesses microscopic surface pores. When these components traverse varied climates and endure fluctuations in temperature and humidity during international shipping, the following risks emerge:
Firstly, Moisture Absorption and Micro-Dimensional Change: Although minimal, humidity changes can cause trace amounts of moisture to be absorbed by the granite’s microscopic structure. For a component certified to sub-micron tolerances, this effect, even temporary, is unacceptable. The thin, specialized oil layer acts as an effective hydrophobic barrier, sealing the surface pores and preventing moisture ingress during transit, thereby ensuring the granite’s certified size and flatness are maintained from our cleanroom to your facility.
Secondly, Preventing Surface Abrasion and Impact Damage: During loading, unloading, and long-haul transportation, minute particulates—dust, salt residue from sea freight, or fine packaging debris—can inadvertently settle on the exposed, polished surface. If these particulates are inadvertently rubbed against the highly finished granite surface, there is a risk of generating minute, yet impactful, micro-scratches or surface imperfections. The oil creates a temporary, cushioning micro-film, holding airborne particles in suspension and preventing them from directly contacting the polished surface, safeguarding the integrity of our master lappers’ work.
ZHHIMG’s Commitment to Precision Delivery
This final oiling procedure reflects ZHHIMG’s holistic approach to quality, extending beyond manufacturing standards (ISO 9001) to encompass full logistics integrity. We are ensuring that the dimensional stability we engineer in our 10,000 ㎡ climate-controlled facility is precisely what your receiving inspection measures. The product is not just protected; its certified status is actively preserved.
Upon unpacking, customers can simply wipe the granite surface clean using a mild, professional granite cleaning solution or denatured alcohol. Once removed, the ZHHIMG® granite base is ready to be integrated into high-speed linear motor stages, CMMs, or semiconductor inspection platforms, providing the unshakeable foundation required by the world’s most demanding applications.
This diligent final step is a subtle, yet powerful, testament to the ZHHIMG commitment: the ultimate goal is not just high precision, but the guaranteed delivery of that precision, anywhere in the world.
Post time: Oct-29-2025