NBN EN ISO 20623 : 2004

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents and materials
   5.1 Cleaning solvents
6 Apparatus
   6.1 Four-ball extreme-pressure lubricant testing machine
   6.2 Friction recording device (optional)
   6.3 Loading discs
   6.4 Microscope
   6.5 Timer
   6.6 Test balls
   6.7 Assembly device
7 Samples and sampling
8 Preparation of apparatus
9 General procedure
10 Test procedures
   10.1 Mean Hertz load (MHL)
   10.2 Wear-load curve, welding load, flash temperature parameter
        and initial seizure load
   10.3 Wear test
11 Calculations
   11.1 General
   11.2 Mean Hertz load
   11.3 Wear-load curve, flash temperature parameter and initial
        seizure load
12 Expression of results
13 Precision
   13.1 General
   13.2 Repeatability
   13.3 Reproducibility
14 Test report
Annex A (normative) Mean Hertz load data sheet
Annex B (normative) Calibration of friction recorder springs
Bibliography
Annex ZA (normative) Normative references to international
         publications with their relevant European publications

Gives procedures for the measurement of the extreme-pressure (EP) and anti-wear properties of lubricating oils and fluids by means of the four ball machine.