ISO 2137:2020 石油製品と潤滑剤—潤滑グリースとワセリンのコーン貫入試験 | ページ 2

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 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, Part 2 (see www.iso.org/directives ).

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents ).

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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 fourth edition cancels and replaces the third edition (ISO 2137:2007), which has been technically revised. The main changes compared to the previous edition are as follows:

• cleaning of cone and shaft assembly with solvent has been introduced to eliminate any drag forces;
• the precision table for repeatability and reproducibility for one-half-scale and one-quarter-scale has been revised to keep only an unconverted value.

Introduction

ISO 2137 was first published in 1972. A second edition was issued in 1985. The third revision was mainly on the dimensional tolerances of the various cones, to better fit with what is available from laboratory equipment suppliers. This revision was necessary because of all the quality plans and data integrity programmes established by numerous laboratories to conform with the various ISO quality standards. In the third edition of ISO 2137, the dimensional tolerances were enlarged to allow most of the cones to fulfil the requirements.

Before adopting changes in the third revision, an interlaboratory study was performed with cones conforming to new requirements and demonstrated that the precision of the method was not altered by changing the tolerances. Tolerances were retained only on the characteristics where it was established that they have a direct impact on the penetration determination, i.e. tip angle, tip height, tip top thickness, tip base diameter, cone angle, total mass of cone plus movable attachments.

1 Scope

This document specifies several methods for the empirical estimation of the consistency of lubricating greases and petrolatum by measuring the penetration of a standardized cone.

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 following terms and definitions apply.

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

Bibliography