UNPARALLELED LTD is one of the leading manufacturers and suppliers of master reference surface plat in China. With abundant experience, we warmly welcome you to buy advanced master reference surface plat made in China here from our factory. We also accept custom orders.
Product Narrative
The Foundation Where Sub-Micron Precision Begins
In modern optical, CMM, and semiconductor manufacturing, a fraction of a micron can separate a perfect production run from millions of dollars in scrapped silicon wafers or misaligned optics.
While motion control motors and high-resolution encoders drive speed, they are useless without a dimensionally stable foundation. Cast iron rings under vibration. Lower-density marble expands unevenly with humidity.
UNPARALLELED® Black Granite Surface Plates provide the ultimate zero-compromise reference plane. Quarried from our exclusive high-density black stone reserves (≈ 3,100 kg/m³), processed in our 10,000 m² constant-temperature cleanroom, and hand-lapped by master craftsmen with over 30 years of experience, these granite bases deliver the vibration damping, corrosion resistance, and thermal mass required for sub-micron repeatability.
quality control
Technical Specifications
The following technical metrics reflect our standard manufacturing capabilities. Custom CAD drawings, custom T-slots, and air bearing channels can be integrated upon request.
| Parameter / Feature | Technical Specification | Operational Benefit |
| Material Grade | UNPARALLELED® Natural Black Gabbro Granite | Natural vibration damping, anti-corrosive, non-magnetic |
| Density | Approx. 3,100 kg/m³ | ~20% higher density than ordinary gray stone or marble |
| Flatness Tolerance | DIN 876 Grade 000 / Grade 00 (Custom to Sub-Micron) | Certified flatness down to nanometer levels |
| Inserts Type | Stainless Steel Threaded Inserts (M4 - M16) | High pull-out strength, flush-potted epoxy bonding |
| Compressive Strength | > 300 MPa | Exceptional load-bearing capacity without deformation |
| Water Absorption Rate | < 0.02% | Zero micro-swelling or humidity warp |
| Thermal Expansion Coeff. | 4.5 - 5.5 x 10⁻⁶ / K | Superior thermal inertia against ambient spikes |
| Certifications | ISO 9001, ISO 14001, ISO 45001, CE Certified | Fully compliant with European & US global standards |
Core Advantages
- No Cheating, Real Black Granite (≈ 3,100 kg/m³): We strictly reject cheap marble or dyed gray stone. Our natural black granite contains no artificial waxes, dyes, or resins on the working plane.
- Precision-Potted Threaded Inserts: Embedded using proprietary anti-vibration epoxy resin. Inserts resist extreme pull-out torque and remain thermal-expansion matched to the surrounding stone.
- Hand-Lapped by 30+ Year Masters: Machine grinding reaches physical limits around 1.5 um. Our master technicians hand-lap final high-spots using electronic level grids to achieve DIN 876 Grade 000 tolerances.
- Built in Military-Grade Anti-Vibration Cleanrooms: Machined and calibrated inside a subterranean 10,000 m² climate-controlled cleanroom featuring 1,000 mm thick isolated concrete floors and 2,000 mm anti-vibration trenches.
- Full Metrology Traceability: Every plate ships with calibration reports using Renishaw Laser Interferometers and WYLER Electronic Levels, fully traceable to national metrology institutes.
factory display
Real-World Applications
This custom granite plate is purpose-built for high-tech OEM integration:
- Semiconductor & Wafer Inspection: Provides a rigid, vibration-damped stage for wafer probing, lithography aligners, and optical scanning systems.
- Coordinate Measuring Machines (CMM): Serves as the primary reference table where zero thermal warping ensures probe measurement repeatability.
- AOI & Laser Processing Beds: Absorbs dynamic forces generated by high-acceleration linear motors during femtosecond laser scribing or PCB drilling.
FAQ
Q1: Why should we specify high-density black granite instead of cast iron or marble?
A: Cast iron expands significantly with heat and rusts over time. Marble is soft, porous, and absorbs moisture, causing it to warp out of flatness. UNPARALLELED® Black Granite (≈ 3,100 kg/m³) is non-magnetic, rust-proof, has twice the vibration damping capacity of iron, and maintains dimensional flatness over decades.
Q2: How do you prevent the threaded inserts from pulling out under high torque?
A: Our threaded steel inserts feature custom exterior knurling and keyways. They are potted into blind granite holes using high-tensile structural epoxy resin under controlled thermal conditions. Every insert cluster undergoes pull-out testing to ensure dynamic reliability under linear drive acceleration.
Q3: Can you manufacture custom sizes with CAD drawings?
A: Yes. Our factory operates 4 ultra-large grinding centers and heavy-duty 100-ton silent cranes. We can produce monolithic granite bases up to 20 meters in length, 4 meters in width, and custom bolt/insert patterns strictly per your 2D/3D CAD specifications.
certificates
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