Conductivity

Several filters were randomly selected from different production batches, then rinsed with 100L/m² pure water for 10-20 minutes. The conductivity ranged from 5-8 μS/cm.

TOC

Several filters were randomly selected from different production batches, then rinsed with 100L/m² pure water for 10-20 minutes. The TOC was about 1 mg/L.

pH

Several filters were randomly selected from different production batches, then rinsed with 100L/m² pure water for 10-20 minutes. The pH ranged from 6.6-6.8.

Endotoxin

Several filters were randomly selected from different production batches, then rinsed with 100L/m² pure water for 10-20 minutes, followed by soaking in pure water for 24 hours. The endotoxin level was < 0.25 EU/mL as indicated by Tachypleus Amebocyte Lysate test.

Endurance to Sterilization

Several filters were randomly selected from different production batches, after 3 cycles of SIP at 126℃ for 30min, filters passed air tightness, diffusion flow, hydraulic stress. Flow rate and pressure dropafter SIP met the product quality standard.

Hydraulic Stress

Several filters were randomly selected from different production batches, respectively conduct hydraulic stress test at ambient temperature and after 3 cycles of SIP at 123℃ for 30 min. High-viscosity solutions was filtered to increase the pressure drop across the filters. Apply forward pulse pressure to the filter at ambient temperature, rinseand conduct diffusion flow. Depth stacked filter can withstand 2.0bar forward pressure at ambient temperature.