ISO 11009:2021 石油製品と潤滑剤—潤滑グリースの水洗い特性の決定 | ページ 2

Foreword

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The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, 1. In particular, the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, 2 (see www.iso.org/directives ).

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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.

This second edition cancels and replaces the first edition (ISO 11009:2000), which has been technically revised.

The main changes compared to the previous edition are as follows:

• addition of a rating of the appearance of the grease and of the water after test;
• addition of a note concerning the application of the test results to determine the symbol 3 “water contamination and rust protection“ of ISO 12924 grease specifications.

Introduction

ISO 6743-9 ^[1] classifies greases according to their conditions of use. The complete designation of a grease comprises of the ISO sign, the letter L (lubricant, industrial oils and related products), the letter X for the grease family, four symbols related to the conditions of use, and the NLGI consistency number. The third symbol is related to the ability of the grease to ensure satisfactory lubrication in presence of water and provide an adequate corrosion protection level.

The symbol 3 is a combination of the rust protection level evaluated using ISO 11007 ^[2] and the level of resistance to water contamination using this document.

Greases are specified in ISO 12924 ^[3].

A rolling bearing grease may be not suitable to lubricate plain bearings or gears.

1 Scope

This document specifies a method for evaluating the resistance of a lubricating grease to washout by water from a bearing, when tested at 38 °C or 79 °C under specified laboratory test conditions.

This test method estimates the resistance of greases to washout from ball bearings under specified conditions. No formal correlation with field service has been established so far.

This document is used for development and specification purposes.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 1998-1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

Bibliography