TECHNICAL DATA  Size gradation                                               75 - 1700μm  Refractive index                                           ≥1.5  Roundness                                                   >85%  Specific weight approx.                                2.5 g/cm3  Bulk weight approx.                                     1.6 kg / l  Anti-skid material                                          –  Coating                                                        silane  Packaging                                                    plastic bags  Storage                                                        dry and sheltered