CFS 5 and CFS 8 Fine Classifier

When fine is not fine enough!

Efficient fine classification with effective results and sharp separation for coarse grain separation as well as product dedusting.

The CFS 5 and CFS 8 are effective laboratory classifiers for the dry separation of small amounts of powders that cannot be processed by conventional dispersing machines due to the desired final fineness. The user friendly design of the machine housing enables fast, complete cleaning of the machine when product or batches are changed.


The plant is designed to be modular, so that other modules can be added, such as our CGS Fluidized Bed Jet Mill, ConJet® High Density Bed Jet Mill, and High-efficiency Classifier Model CFS/HD-S to make a completely versatile laboratory platform.

NETZSCH Laboratory Plants

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NETZSCH CFS 5 & CFS 8 Fine Classifier Technique


  • Finenesses from d97 10 µm to d97 250 µm (based on limestone)
  • Laboratory classifier with vertical shaft
  • Vortex free fines outlet with expansion chamber to reduce circumferential speed and wear as well as build-up of residues
  • Classifier wheel with simultaneously rotating immersion tube to achieve highest finenesses, unlimited adjustment
  • Gap between classifier wheel and fines outlet rinsed by gas for highest possible prevention of oversize material in the fines fraction
  • Classifier shaft seal rinsed by compressed gas to protect the bearings
  • Bearing of the classifier shaft permanently grease lubricated
  • Exact, sharp separation through optimized classifier design
  • Even load on the classifier wheel through rotationally symmetric construction of the machine
  • Hinged classifier head provides good access for fast and easy cleaning and maintenance
  • Reproducible results
  • Shipped ready for immediate operation
  • Can be combined with other machine modules

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