Mütek DFR-05

Drainage Freeness Retention

Applicable standards:

Product code: 


Lab simulation of drainage, freeness and retention processes onsite

The Mütek™ DFR-05 Drainage Freeness Retention simulates the  retention  and  drainage  conditions  prevailing  in  a  paper  machine immediately before  and  during  sheet  forming. Chemical addition is fully automatic via a dosing module. The optionally available RET-20 Lab Sensor directly measures the filtrate consistency, making a manual determination of stock and ash consistencies superfluous. The drainage behavior is characterized by gravimetry of the filtrate volume. 

  • Systematical assessment of chemical  influences in the papermaking process
  • Characterize and screen retention agents and drainage aids
  • Automatic consistency measurement
  • Detection of Schopper-Riegler and Canadian Standard Freeness (CSF)


  • Develop and characterize retention agents and drainage aids the market demands
  • Understand chemical reactions in the lab and onsite
  • Apply the correct additive in a process environment
  • Optimize chemical dosages for better operation and cost saving
  • Accurate automated consistency results for fiber stock and pigments (ash) replacing time-consuming manual determination
  • Transportable for onsite use


The Mütek™ DFR-05 is designed for use with a PC and application software. The RET-20 Lab sensor is optional. The instrument is intended for indoor use at temperatures in the range of 15 °C to 40 °C (59 °F – 104 °F). It is rated for voltages of 100 – 240 VAC at 50 Hz / 60 Hz.

The DFR is also available as a special freeness version, the Mütek DFR-05 Freeness.


  • Retention and drainage Stock samples in the consistency range of 0.2 % to 2 %. A sample volume of  1  liter  is  required  per  measurement.  Since  the sample  temperature  strongly  impacts  the  test  results,  the  temperature should  be  kept  constant.
  • Freeness Freeness measurement is performed in line with DIN EN ISO 5267-1 2000 which specifies that the sample is to be diluted to 0.2 % consistency using  distilled  water.  Temperature should be adjusted to 20 °C. A sample volume of  1  liter  is  required  per measurement.