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            玻璃珠 Glass beads
             產品貨號: SG8772
             產品名稱: 玻璃珠 Glass beads
             產品價格/規格: 10g 160元/100g1500元
             產品說明書: 點擊查看
             更新時間: 2022-06-07
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            • Glass beads, acid-washed

              Cat No:SG8772

              Store at Room Temperature

              直徑:425-600 μm (30-40 U.S. sieve)

              Product Description

              Density:  2.5 g/ml
              Refractive index:  1.51-1.52
              Compressive strength (psi average):  36,000
              Poisson’s Ratio (psi):  0.21
              Rigidity Modulus (psi):  4.3 x 106
              Young’s Modulus (psi):  10 x 106
              Hardness (Knoop 100 g load):  515 kg/mm2
              Coefficient of friction (static):  0.9-1.0
              Chemical composition:  soda-lime silica glass
              Softening point (dilatometer):  589 °C
              Expansion Coefficient (25-300 °C):  85 x 107  per °C
              Strain point:  505 °C
              Annealing point:  548 °C
              Dielectric Constant:  1 Kc 7.6 D.C.
              Volume Resistivity (Ohm-cm):  25 °C 6.5 x 1012

              Lost tangent:   1 Kc 2.0% 100 Kc 1.0%.

                  A bead size of 0.5 mm is recommended for use in breaking open yeast cells.  A protocol for the use of 0.45 to 0.55 mm acid-washed glass beads from Sigma for cell disruption of yeast cells has been published.


              10g 160元

              100g 1500元

              1. Ausbel, F. M., et al., Short Protocols in Molecular Biology, Greene Pub. Associates and Wiley-Interscience (N. Y. 1995), 3rd ed., 13-51.
              2. Jazwinski, S. M., Preparation of Extracts from Yeast.  Methods in Enzymology, 182, 163 (1990).


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