Foreword

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This document was prepared by Technical Committee ISO/TC 28, Petroleum and related products, fuels and lubricants from natural or synthetic sources.

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Introduction

There are many ways to evaluate the behaviour of grease in the presence of water.

ISO 11009 describes a method to evaluate the resistance of grease to washout from a bearing in laboratory conditions.

ISO 11007-1 and ISO/TS 11007-2 evaluate the ability of grease to protect bearings against corrosion in dynamic conditions and in the presence of washout respectively.

ASTM D7342 ,^[ 4 ^] ISO 12921 and NF T60-626 ^[ 6 ^] describe methods to assess the working stability of grease in the presence of water.

The action of water on greases can be shown by a relatively significant absorption of water, by a relatively significant hardening or softening or by a loss of adhesiveness on metallic surfaces.

The purpose of this document is to prescribe a method to evaluate the behaviour of grease when it is rolled in the presence of water. This is done by evaluating the consistency change (see Reference [7]), and hence predicting its mechanical behaviour, the risk of leakages due to excessive softening and the risk of loss of the lubricating property by either excessive hardening or complete solubilisation of the grease.

1 Scope

This document specifies a method for evaluating the change of consistency, as measured by cone penetration, of lubricating grease when worked in the roll stability test apparatus, in the presence of water. The method described in this document only applies to greases with cone penetration in the range of 175 × 0,1 mm to 385 × 0,1 mm as measured using ISO 2137 .

2 Normative references

3 Terms and definitions

4 Principle

5 Significance of the test

6 Sampling

7 Apparatus

7.1

7.2

7.3

7.4

7.5

8 Reagents

8.1

9 Procedure

9.1 Determination of the penetration, p₁

9.2 Preparation of the apparatus

9.3 Running the test

10 Calculation

11 Expression of the result

12 Test report

13 Precision

13.1 General

13.2 Repeatability, r

13.3 Reproducibility, R

Bibliography