Semi-synthetic emulsion metalworking fluid


GREIBOCUT 4021 is a boron and formaldehyde free semi-synthetic, multi-purpose coolant. This amine containing emulsion is developed for light to medium machining operations on steel, cast iron and various aluminium alloys. Due to the good flushing performance and excellent low foam tendency, GREIBOCUT 4021 is also well suited for grinding operations in the bearing and other precision industries.

GREIBOCUT 4021 has a mineral oil content of approx. 20% The concentrate does not contain nitrite or secondary amines, therefore it meets the TRGS 611 regulations, also special inhibitors give effective prevention against nitrosamine formation Due to an efficient anti-corrosion additive system GREIBOCUT 4021 emulsions provide long-term pH-stability and excellent tank life.

We recommend to make-up the GREIBOCUT 4021-emulsion with a proportional coolant mixing system. Ideally fill using room temperature water with a hardness range from 100 to 370 ppm CaCO3. If manually filling, the concentrate should be added slowly to the water in an area where the fluid is moving rapidly. The maximum working temperature of the emulsion is approximately 40 QC, We recommend testing all sensitive materials for compatibility, particularly for staining and discolouration before using GREIBOCUT 4021.

The concentrate storage temperature is ideally between 5 to 35 °C and the container must be protected from frost. The shelf life of GREIBOCUT 4021 is 12 months.


Key Benefits:

  • free from boric acid
  • free from formaldehyde release biocide
  • optimised pH-stability due to modern amine composition
  • very good flushing capability
  • stable long life emulsion
  • suitable for machining and grinding
  • Low foam


Physical data

Appearance/20 °C


clear — slightly hazy, light brown liquid  
Density/20 °C DIN 51757 approx. 0.995 g/cm3
Viscosity/20 °C DIN 51562/1 approx. 143 mm2/s
pH-value, 5 %, DIN water, 20 °C
DIN 51369

approx. 10.3
pH-value after 24 — 72 hours of using
DIN 51369

approx. 9.4 — 9.6
Corrosion protection, 3 %
DIN 51360/2

note 0
Foam behavior, 5% conc using water with 350 ppm CaCO3

PLM 045

immediate foam collapse 


Factors for concentration determination

Refractometer 1.5
Acid split method 2.9
acidimetric titration up to pH 4 0.36
acidimetric titration up to pH 7 0.41


Concentrations recommended for use

machining operations: 5 — 10 %
grinding: 3 — 4 %


All information quoted above is based on our experience and actual kn"w-how but is given without guaranteeand obligation. Recommendations on the application and use of cur products, shoulrl be adapted the particular working conditions and materials employed.