Jour : 03/09/2026

I. Material and Long-term StabilityNatural aging, extremely low internal stress: High-quality granite (s Jinan Black) undergoes geological aging over hundreds of millions of years, releasing internal residual stress. After precision machining, there is almost no slow deformation, and the precision retention cyc is long (no major overhaul or calibration required for 5–8 years), far superior…

Flatness error inspection of granite platforms shall be conducted in accordance with GB/T 20428-2006 “Rock Slabs”* as a priority. Common methods include the electronic level method, laser interferometer method, optical flat interferometry method, and dial indiator method. Selection should be based on precision requirements and on-site conditions. I. Common Methods and Applicable ScenariosTable Method Equipment…