国产一级 片内射视频播放,国产又黄又爽又猛视频日本,无码日韩高清,国产三级片中文

<cite id="aqcdz"></cite>
<b id="aqcdz"></b>

  • <b id="aqcdz"><small id="aqcdz"></small></b>
    <u id="aqcdz"></u>

    •  <b id="aqcdz"></b>
  • <b id="aqcdz"></b>

    • 首頁
    •  
    • 產(chǎn)品
    •  
    • 寶石材料
     
    寶石材料

     

    Sapphire is a single crystal aluminum oxide (Al2O3). Its Mohs hardness is 9, it is one of the hardest materials. Sapphire has good mechanical strength, and it is also transparent from visible to IR spectrum. So, it is always used as window material where scratch resistance is required.

    • Lattice Constant: a =4.75 A; c =12.97A
    • Transparent Range: 180nm ~ 4500nm
    • Density: 3.98g/cm3
    • Mohs Hardness: 9
    • Melting Point: 2030℃
    • Thermal Conductivity: 0.04W/m/K
    • Expansion Coefficient: 8.4x10-6/K
    • Refractive Index: 1.755@1um
     

     

     

    Sapphire Material


       PDF to download