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Hard stone (EPUSTONE)
Industrially mined hard stone (commonly known as granite) has been used for several decades for measuring plates, straightness and angle standards, and machine bed components for measuring and high-precision production machinery. Hard stone is an isotropic, homogeneous material that follows Hooke’s law and can be analyzed using linear-elastic FEM modeling.
Product Description
- Plutonic rock with a very dense and homogeneous microstructure
- Most suitable materials: “Gabbro Impala” from South Africa and “Tarn” from France
Added value
- Surface supports the use of air bearings
- Outstanding thermal stability
- High level of precision
Areas of application
- Machine beds for all industries
- Machine components (e.g. traveling columns, gantries, traverses)
- Measuring machines
- Measuring equipment
- Suitable for individual pieces or special parts, and for small to medium quantities
Technical Specifications
Impala | Black Galaxy | Ji Nan Black | Tarn | |
Origin | Südafrika | Indien | hina | Frankreich |
Bild | Bild | Bild | Bild | |
Density kg/dm³ | 2,90 | 2,90 | 3,00 | 2,60 |
Compressive strength N/mm² | 300 | 190 | 250 | 180 |
Flexural strength N/mm² | 20 | 19 | 26 | 24 |
Modulus of elasticity kN/mm² | 90 | 44 | 70 | 46 |
Thermal expansion 10-6 K-1 | 6,5 | 6,0 | 5,0 | 6,0 |
Documents/Downloads