ISO 20623:2017
Petroleum and related products — Determination of the extreme-pressure and anti-wear properties of lubricants — Four-ball method (European conditions)
ISO 20623:2017 specifies procedures for the measurement of the extreme pressure (EP) and anti-wear properties of liquid lubricants (categories C, D, F, G, H, M, P of ISO 6743‑99), lubricating greases (ISO 6743‑9, category X) and other consistent lubricants. The test conditions are not intended to simulate particular service conditions, but to provide information over a range of standard conditions for the purpose of research, development, quality control and fluid ranking. The output is used in lubricant specifications.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Cleaning solvents
6 Apparatus
7 Samples and sampling
8 Preparation of apparatus
9 General procedure
10 Test procedures
10.1 Test A — Load-Wear Index (LWI)
10.2 Test B — Wear-load curve, welding load, and initial seizure load
10.3 Test C — Wear test
11 Calculations
11.1 General
11.2 Test A — Load wear index
11.3 Test B — Wear-load curve, initial seizure load
11.4 Test C — Wear test
12 Expression of results
13 Precision
13.1 General
13.2 Repeatability
13.3 Reproducibility
14 Test report
Annex A (normative) Test ball specifications
Annex B (normative) Mean Hertz Load data sheet
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Cleaning solvents
6 Apparatus
7 Samples and sampling
8 Preparation of apparatus
9 General procedure
10 Test procedures
10.1 Test A — Load-Wear Index (LWI)
10.2 Test B — Wear-load curve, welding load, and initial seizure load
10.3 Test C — Wear test
11 Calculations
11.1 General
11.2 Test A — Load wear index
11.3 Test B — Wear-load curve, initial seizure load
11.4 Test C — Wear test
12 Expression of results
13 Precision
13.1 General
13.2 Repeatability
13.3 Reproducibility
14 Test report
Annex A (normative) Test ball specifications
Annex B (normative) Mean Hertz Load data sheet
Bibliography