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NBN EN ISO 20623 : 2004
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PETROLEUM AND RELATED PRODUCTS - DETERMINATION OF THE EXTREME-PRESSURE AND ANTI-WEAR PROPERTIES OF FLUIDS - FOUR BALL METHOD (EUROPEAN CONDITIONS)
12-01-2013
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
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