Physical Tests

Standard/                  applicable to

 Title                             Keyword/  
Meas. Unit
 Conditions    Description                                
DIN 50 981
DIN 50 984
Layer thickness  µm  DIN 50 982-2   Determination of layer thickness.

DIN 51 412-1
(DIN IEC 247)


Testing of petroleum products; Determination of the electrical conductivity
Part 1: Laboratory method
Part 2: Field method
Electrical conductivity/
pS/m (Ohm x cm)
 at 23 °C Procedure for measurement of the electrical conductivity of liquids. Cannot be used with insulating oils. The test makes use of a conductive receptacle containing approx. 100ml of the liquid under test, to which a direct current voltage of 100V is applied. The electrical conductivity can be calculated from the measured voltage drop.

DIN 51 562-1


Viscosimetry; Measurement of kinematic viscosity using the Ubbelohde viscometer; Part 1: Geometrical design and performance of measurements Viscosity/
at 40 °C, at 100 °C
Silicone oil
at 25 °C
Method for the determination of the kinematic viscosity of transparent, Newtonian liquids in the range 0.35mm²/s to 100,000mm²/s at temperatures between 10C and 100C. The test measures the time taken for a certain volume (measured by two ring marks) of the liquid under test to flow through a capillary tube under the influence of gravity.

DIN 51 581


Determination of evaporation loss

Evaporation loss/
% in mass

T = 250 °C, 60 min Determination of evaporation loss of an oil over a specified time period t at a specific temperature T.

DIN 51 755

Oils, solvents

Determination of flash point using the Abel-Pensky closed cup method Flash point/
Temperature range from 5 °C to 65 °C Determination of flash point of mineral oils and other combustible liquids. Other tests are used for higher flash points.

DIN 51 757


Determination of density of mineral oils and related substances Density/
kg/l of g/ml
at 15 °C To convert mass to and from volume. 
DIN 51 805
Oils, Greases
Determination of flow pressure of lubricating greases, Kesternich method Flow pressure/
mbar, °C
Lower operating temperature for lubricating greases according to DIN: flow pressure < 1.400 mbar A test nozzle filled with lubricating grease is connected to a pressurized gas source and a pressure gauge. At a specific, constant temperature, the pressure is continually increased until the lubricating grease rope snaps and the pressurized gas escapes through the nozzle. The lower operating temperature for lubricating greases according to DIN 51 825 is defined by the flow pressure as maximally 1400 mbar.

DIN 51 813



Determination of the amount of solid substances in lubrication greases, particle sizes > 25 µm Solids content/
mg/kg or ppm
Only for soap-based lubrication greases without added solid lubricants  Determination of the amount of solids, impurities in lubricant greases that can cause lubrication problems, noise and wear. 500 g of the grease is pressed through a sieve. Then, the residue in the sieve is mixed with a solvent and impurities are washed out.

DIN 51 817

Greases (Pastes)

Determination of oil separation from lubricating grease under static conditions Oil separation/
% in mass
t/T Determination of the bleed properties over a specified time period t and temperature T

DIN 51 832


Particle size  µm d 50, d 99, max. Determination of average (d50) and maximum (d99) particle size.

DIN 52 612

Thermally conductive pastes

Thermal conductivity W/mK   Testing of thermal conductivity of a substance.

DIN 53 481
DIN IEC 234-2

Insulating pastes,

Thermally conductive pastes

Dielectric strength kV/mm at 20 °C,  0,05 inch separation Electrical testing.

DIN 53 482

Insulating pastes,

Thermally conductive pastes

Electrical greases

Specific resistance Ohm x cm at 25 °C,
Electrode separation 1 cm,
Electrode area 1 cm²
Testing of electrical resistance of a substance.

DIN 58 397-1


Evaporation loss Weight percent t/T Determination of the evaporation loss of a lubricant over a defined period of time, t, at a defined temperature, T.

DIN EN 22719
DIN ISO 2592


  °C > 79 °C
< 65 °C
< 5 °C
Lowest temperature at which the evaporating oil can be ignited by an external ignition source.


All substances

Density g/ml at 20 °C  

DIN ISO 2176

Greases, pastes

Drop point °C   Temperature at which the structure of the grease breaks down.

DIN ISO 3016


Pourpoint °C 3°C steps Temperature at which the oil first becomes capable of flow.
Insulating pastes Dielectric constants 1 kHz - 10 MHz Electrical testing.
Insulating pastes Arc stability s   Electrical testing.
Insulating pastes Dielectric loss factor tan 1 kHz - 10 MHz Measurement of dielectric loss factor.