配粉桶使用，本司筛选最优质的粉来生产。    密度：0.935g/cm3                        弯曲韧度: ≤0.2mm/10Kg 50cm破裂强度:≥23.8kg/50cm  透气精密:20um透气量:72m3/h   流量阻力: 5.8kpa(20tmm)                                                                                 3.15kpa(15tmm)                                                                                              2.82Pa(10tmm)