Keywords: Granite surface plate, material properties, metrological precision, dimensional stability
Granite surface plates are renowned in metrology for their exceptional physical and mechanical properties. Key characteristics include:
- High Hardness & Uniform Structure: With Shore hardness exceeding 70Hs and uniform mineral distribution, granite plates resist surface deformation under heavy loads.
- Thermal Stability: A linear expansion coefficient of 4.61×10⁻⁶/°C ensures minimal thermal distortion during use, critical for temperature-controlled environments.
- Chemical Inertness: Resistant to acids, alkalis, and organic solvents, making them suitable for harsh industrial applications.
- Precision Manufacturing: Modern plates achieve flatness deviations within ±3μm over large areas (e.g., 1000×1000mm), adhering to ISO 8512-2 and AS 1004.2 standards.
Comparative analysis with cast iron plates reveals granite’s superiority in long-term dimensional stability and corrosion resistance. Recent innovations, such as nano-particle-reinforced composites, further enhance wear resistance without compromising homogeneity.
