花岗石平板精度：000级=1×(1+d/1000)um00级=2×(1+d/1000)um 0级=4×(1+d/1000)um1级=8×(1+d/1000)um（d为对角线mm ）计算平面度公差依GB4987-85标准：物理性能比重：2970-3070kg/㎡抗压强度：245-254N/m㎡线膨胀系数：4.13% 肖氏硬度：Hs70以上 ，花岗石平板的特点主要是精度稳定、维护方便。是用天然的石质材料制成的精密基准测量工具，对仪器仪表、精密工具、机械的检验，都是理想的基准面。花岗石平板主要矿物成分为辉石，斜长石，少量橄榄石，黑云母以及微量磁铁矿，黑色光泽，结构精密，质地均匀，稳定性好、强度大、硬度高，能在重负荷下保持高精度。Reasons: ① granite slab structure dense, smooth surface wear, roughness values are small; ② granite by a long-term natural aging, the stress disappear, material stability, and will not be deformed; ③ alkali, acid resistance, corrosion, anti-magnetic; ④ moisture will not rust, easy to use and maintain; ⑤ linear expansion coefficient and the influence of temperature are smaller; ⑥ face scratched by the collision or after, only produce pits, does not produce convexity pattern burr, no effect on the measurement accuracy. Suitable for industrial production, laboratory measurements and measurement precision. 61 × 10-6 / ℃ water absorption: <0. Granite slab main drawback is that the impact can not be too much to bear, beat, will be deformation of high humidity, moisture absorption is 1%.

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