Process applications / CMP
CMP Filtration: Removal and Retention
Identify both objectives
Slurry filtration involves controlling oversized particles while retaining useful abrasives. A single nominal rating cannot describe the relationship between these goals.
Compare process data
Review before-and-after particle-size distributions, solids content, pressure rise and throughput. Define sampling methods and comparison conditions.
Return to process validation
Evaluate filtration together with process results. Without comparative data under equivalent conditions, a pore rating cannot substantiate yield or service-life advantages.
Separate filtration from changes in the slurry
Holding, recirculation, pumping and mixing can change particle distributions. Keep batch, sampling time and sample preparation consistent when comparing filters, and include an unfiltered control with matched holding history. Otherwise sedimentation, aggregation or pump effects may be attributed incorrectly to the medium.
- Record slurry lot, circulation history and mixing before sampling.
- Define methods for large-particle counts, size distribution and solids content.
Constrain the choice with process outcomes
Reducing abnormal particles is only part of the assessment. Also observe useful abrasive populations, solids concentration and relevant process results. A lower large-particle count accompanied by a substantial composition change needs further evaluation. Without controlled process evidence, do not translate a finer rating into a fixed yield improvement.
- Compare filtrate quality, pressure-rise trend and throughput per area together.
- Document downstream validation methods and conditions not yet covered.
This general guide does not replace controlled technical documents or validation under actual process conditions.
Explore product series in our handbook →