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Up to 1 mm flatness- High inertial mass
- Chemical resistant
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Product Detail
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Granite is natural rock that is commonly used for equipment platforms, bridges and gantries. While granite does not offer the lightweight rigidity of honeycomb structures, it is highly useful for applications requiring large inertial masses or an excellent polished finish. Granite is also three times lighter than cast iron, non-magnetic, non-conductive, non-corrosive and not susceptible to acids (except hydrofluoric). Since granite is easily ground and has been naturally stress relieved over millions of years, flatness better than 1mm can be achieve for highly critical applications. |
Advantages |
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High inertial mass - Excellent flatness
- Excellent chemical resistance
- Aesthetic finish
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Disadvantages |
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Much heavier than Honeycomb - Poor damping properties
- Poor compliance at high frequencies
- Expensive to machine or add tapped holes
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Newport’s DynamYX™ high throughput airbearing wafer positioner uses granites' high inertial mass and excellent flatness.
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Superflat granite structures enable a variety of technologies.
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Types of Granite |
Blue Granite (France)—Excellent wear resistance due to presence of high grade quartz. Blue granite is used for very large structures.
Black Granite (South Africa)—Low thermal expansion and low water absorption. Black granite is used for most standard applications such as metrology surface plates.
Fine Black Granite—Excellent elastic modulus due to absence of quartz and good adhesion of grains. Fine black granite is used for small structures requiring high mechanical resistance.
Contact the Newport Custom Products Group for assistance with granite structure design. |
Polymer Granite Composites |
Granite composites offer a unique solution for more complex structural systems. Granite composites are made of over 90% crushed granite with an epoxy binder. These materials offer many of positive attributes of granite such as large mass, a polished finish and high chemical resistance but with much better damping performance.
The primary benefit of Granite/Epoxy composites is the ability to cast these materials into complex shapes. For OEMs producing reasonable quantities of machines, granite composites can be far more cost effective than pure granite. With proper tooling cut outs, holes and angled shapes can be cast into the material without the difficult slicing, bonding and boring required by traditional granite. |
Complex shapes are designed in our Custom Products Group.
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Granite can be assembled into complex platforms and bridges.
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