Precision metrology platforms and optical inspection stations in laboratories operate year-round under constant temperature & humidity or ventilated conditions. Many metal reference platforms gradually suffer corrosion and oxidation peeling after long service. Oxide particles form on the surface, damaging the reference plane. Flaking rust contaminants also pollute test workpieces and optical components, requiring regular rust removal and re-grinding maintenance, which brings substantial time costs. As natural mineral aggregates, granite does not oxidize or corrode. Thanks to this material property, ZHHIMG® granite bases can retain the original state of reference surfaces for a long time in laboratory environments and greatly reduce later maintenance workload.
Oxidation of metal substrates is essentially a chemical reaction between the material and oxygen, moisture in the air. Even with protective coatings, cast iron and steel bases will expose the substrate once the coating is scratched by hard impacts and gradually rust. As coatings age and peel off, rust continues to spread. Granite is densely crystallized from multiple stable silicate minerals. Its chemical properties are stable, so it will not oxidize like metals and has no risk of rusting. The fine-grained black granite selected by ZHHIMG® features inert mineral components. Under conventional laboratory temperature and humidity conditions, it does not chemically react with moisture or air, and no oxide layer forms on the reference surface.
Many buyers confuse oxidation with stone weathering. The two need to be distinguished clearly. Weathering refers to slow erosion caused by long-term outdoor exposure to strong ultraviolet rays, acid rain and drastic temperature fluctuations. In indoor laboratory environments without intense ultraviolet rays or corrosive acid and alkali, granite barely undergoes weathering. ZHHIMG® granite bases go through ore screening and internal defect inspection. The stone contains no loose interlayers or soluble minerals and will not surface-powder in common constant-temperature & humidity lab environments or ordinary chemical aerosol conditions. As long as it avoids heavy hard impacts and splashes of strong acid or alkali, the precision ground reference surface can stay stable for years.
Stable oxidation-free reference surfaces bring remarkable benefits to continuous laboratory metrology. Once an oxide layer forms on a reference platform, flatness and roughness keep deteriorating, introducing random errors in every measurement and requiring frequent re-testing and calibration. ZHHIMG® granite reference surfaces are free from oxidation and rust. Their micro surface structure stays stable over time, and measurement repeatability can remain at factory levels. They are ideal for university labs, metrology institutes, semiconductor inspection laboratories and other scenarios requiring year-round uninterrupted precision testing. Unlike metal platforms, they need no regular anti-rust maintenance or repainting, cutting downtime for equipment upkeep. 
That said, oxidation resistance does not mean immunity to all external contaminants. If laboratory chemical reagents, strong acids or alkalis spill directly onto the base surface, they can still erode mineral grain boundaries and cause surface damage. ZHHIMG® supplies operation and maintenance recommendations to customers upon product delivery, reminding users to avoid prolonged contact between reference surfaces and highly corrosive liquids. The accompanying factory inspection report records the original flatness and roughness of the reference surface, enabling customers to conduct comparison verification every few years and track long-term stability.
ZHHIMG® granite bases naturally feature oxidation and rust resistance. They will not develop metallic oxidation and corrosion under normal indoor laboratory conditions, and precision ground reference surfaces can remain intact for a long period. Compared with metal reference platforms such as cast iron, they eliminate anti-rust maintenance procedures and guarantee stable metrology and inspection results long-term. They serve as ideal reference bearing platforms for optical experiments, CMM measurement and precision positioning laboratories.
Post time: Sep-23-2026