ISO 4788:2005 実験用ガラス器具—メスシリンダー | 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.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, 2.

The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

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.

ISO 4788 was prepared by Technical Committee ISO/TC 48, Laboratory glassware and related apparatus, Subcommittee SC 6, Laboratory and volumetric ware.

This second edition cancels and replaces the first edition (ISO 4788:1980), which has been technically revised to incorporate the following changes:

• a) three types of graduated measuring cylinders have been specified;
• b) two classes of accuracy have been introduced;
• c) cylinders of squat form have been added;
• d) marking of cylinders has been changed;
• e) capacity at lowest graduation line for 5 ml and 10 ml cylinders has been increased.

Introduction

The first edition of this International Standard (ISO 4788:1980) was originally written when the use of measuring cylinders was largely limited to the approximate dispensing of reagents in wet chemical analytical procedures; only one grade of accuracy was specified.

More recently, with the increasing demand for accreditation and changing uses to which measuring cylinders are put, a significant demand has emerged worldwide for a more accurate class to complement the originally specified range.

Also, with more work being carried out in laminar-flow cabinets, glove boxes and fume extraction hoods, in which working heights are restricted, a need for short (squat) measuring cylinders has emerged.

This International Standard addresses these two needs, and has been prepared to meet the requirements of ISO 384. This International Standard includes

• a) spouted measuring cylinders of traditional (tall) form, accuracy classes A and B,
• b) stoppered measuring cylinders of traditional (tall) form, accuracy classes A and B, and
• c) spouted measuring cylinders of squat form, accuracy class B.

Class A has been considered for the third type (squat cylinders) but discounted because ISO 384 requirements would only be met by cylinders having manufacturing specifications which would be virtually impossible to satisfy.

1 Scope

This International Standard specifies dimensions, material and constructional and metrological requirements of graduated measuring cylinders of tall form (Type 1a and Type 1b) and of squat form (Type 2). All types are suitable for general laboratory use.

The specifications in this International Standard are in conformity with the principles of design and construction of volumetric glassware given in ISO 384.

2 Normative references

The following referenced documents are indispensable for the application 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.

Bibliography