SIST EN ISO 385:2005

SLOVENSKI STANDARD
SIST EN ISO 385:2005
01-junij-2005
Laboratorijska steklovina – Birete (ISO 385:2005)
Laboratory glassware - Burettes (ISO 385:2005)
Laborgeräte aus Glas - Büretten (ISO 385:2005)
Verrerie de laboratoire - Burettes (ISO 385:2005)
Ta slovenski standard je istoveten z: EN ISO 385:2005
ICS:
17.060 Merjenje prostornine, mase, Measurement of volume,
gostote, viskoznosti mass, density, viscosity
71.040.20 Laboratorijska posoda in Laboratory ware and related
aparati apparatus
SIST EN ISO 385:2005 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 385:2005

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SIST EN ISO 385:2005
EUROPEAN STANDARD
EN ISO 385
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2005
ICS 17.060; 71.040.20
English version
Laboratory glassware - Burettes (ISO 385:2005)
Verrerie de laboratoire - Burettes (ISO 385:2005) Laborgeräte aus Glas - Büretten (ISO 385:2005)
This European Standard was approved by CEN on 14 April 2005.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 385:2005: E
worldwide for CEN national Members.

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SIST EN ISO 385:2005
EN ISO 385:2005 (E)



Foreword

This document (EN ISO 385:2005) has been prepared by Technical Committee ISO/TC 48 "Laboratory
glassware and related apparatus" in collaboration with Technical Committee CEN/TC 332 "Laboratory
equipment", the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by October 2005, and conflicting national standards shall
be withdrawn at the latest by October 2005.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia,
Spain, Sweden, Switzerland and United Kingdom.


Endorsement notice

The text of ISO 385:2005 has been approved by CEN as EN ISO 385:2005 without any modifications.


2

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SIST EN ISO 385:2005


INTERNATIONAL ISO
STANDARD 385
First edition
2005-04-15

Laboratory glassware — Burettes
Verrerie de laboratoire — Burettes




Reference number
ISO 385:2005(E)
©
ISO 2005

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SIST EN ISO 385:2005
ISO 385:2005(E)
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©  ISO 2005
The reproduction of the terms and definitions contained in this International Standard is permitted in teaching manuals, instruction
booklets, technical publications and journals for strictly educational or implementation purposes. The conditions for such reproduction are:
that no modifications are made to the terms and definitions; that such reproduction is not permitted for dictionaries or similar publications
offered for sale; and that this International Standard is referenced as the source document.
With the sole exceptions noted above, no other part of this publication may be reproduced or utilized in any form or by any means,
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ii © ISO 2005 – All rights reserved

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SIST EN ISO 385:2005
ISO 385:2005(E)
Contents Page
Foreword. iv
1 Scope. 1
2 Normative references . 1
3 Terms and definitions. 1
4 Basis of adjustment . 2
4.1 Unit of volume . 2
4.2 Delivery volume. 2
4.3 Reference temperature. 2
5 Types and classes of accuracy . 2
5.1 Classes of accuracy. 2
5.2 Types of burette . 2
6 Maximum permissible errors . 2
7 Material. 3
8 Construction. 3
8.1 Dimensions. 3
8.2 Top of burette . 4
8.3 Stopcocks and similar devices. 4
8.4 Stopcock leakage. 5
8.5 Delivery jet . 5
8.6 Delivery time. 5
8.7 Waiting time. 6
9 Graduation, figuring and patterns. 6
9.1 Graduating patterns. 6
9.2 Position of graduation lines. 6
9.3 Marking of graduation lines . 6
10 Setting of the meniscus. 6
11 Markings. 7
12 Visibility of graduation lines, numbers and inscriptions. 7
Annex A (normative) Burettes for which no waiting time is specified. 8
Annex B (normative) Burettes for which a 30 s waiting time is specified. 10
Bibliography . 12

© ISO 2005 – All rights reserved iii

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SIST EN ISO 385:2005
ISO 385:2005(E)
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, Part 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 385 was prepared by Technical Committee ISO/TC 48, Laboratory glassware and related apparatus,
Subcommittee SC 6, Laboratory and volumetric ware.
This first edition cancels and replaces ISO 385-1:1984, ISO 385-2:1984 and ISO 385-3:1984, which have
been technically revised and combined into one document.
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SIST EN ISO 385:2005
INTERNATIONAL STANDARD ISO 385:2005(E)

Laboratory glassware — Burettes
1 Scope
This International Standard provides metrological and construction requirements for an internationally
acceptable series of burettes, suitable for general laboratory purposes.
The details specified are in accordance with the principles of design and construction of volumetric glassware
given in ISO 384.
NOTE For piston burettes, see ISO 8655-3.
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.
ISO 384:1978, Laboratory glassware — Principles of design and construction of volumetric glassware
ISO 719, Glass — Hydrolytic resistance of glass grains at 98 °C — Method of test and classification
ISO 4787:1984, Laboratory glassware — Volumetric glassware — Methods for use and testing of capacity
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
delivery volume
volume of liquid discharged from a volumetric instrument, such as a burette
NOTE Due to retention of liquid on the inner surface of the volumetric instrument, the volume of liquid delivered is not
identical with the volume of liquid contained by the volumetric instrument.
3.2
delivery time
time required for the descent of the liquid meniscus from the zero line to the lowest graduation line of the
volumetric instrument
3.3
waiting time
time to be observed after apparent completion of the liquid delivery of the volumetric instrument and before
the final reading of the delivered volume is taken
NOTE A waiting time applies for burettes Class AS (see 5.2).
© ISO 2005 – All rights reserved 1

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SIST EN ISO 385:2005
ISO 385:2005(E)
4 Basis of adjustment
4.1 Unit of volume
3
The basic unit of volume shall be the millilitre (ml), which is equivalent to one cubic centimetre (cm ).
4.2 Delivery volume
Burettes shall be adjusted with water to deliver their volume (Ex), from the zero line to any graduation line, the
outflow being unrestricted until approaching the final position of the meniscus. For burettes with a waiting time
(Class AS), 30 s shall elapse before final setting of the meniscus.
4.3 Reference temperature
The standard reference temperature, i.e. the temperature at which the burette is intended to deliver its
nominal volume (nominal capacity), shall be 20 °C.
When the burette is required for use in a country which has adopted a standard reference temperature of
27 °C (the alternative recommended in ISO 384 for tropical use), this value shall be substituted for 20 °C.
5 Types and classes of accuracy
5.1 Classes of accuracy
Two classes of accuracy are specified:
 Class A (subdivided into Classes A and AS) for the higher grade;
 Class B for the lower grade.
5.2 Types of burette
The following two types of burette are specified:
 that for which no waiting time is specified (Classes A and B);
 that for which a waiting time of 30 s is specified (Class AS).
6 Maximum permissible errors
6.1 Errors in the delivered volume shall not exceed the limits given in Table 1. These limits represent the
maximum permitted error at any point on the scale, and also the maximum permissible difference between the
errors at any two points.
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SIST EN ISO 385:2005
ISO 385:2005(E)
Table 1 — Capacities, subdivisions and maximum permissible error
Maximum permissible error
Nominal capacity Subdivision
Classes A and AS Class B
ml ml ml ml
1 0,01 ± 0,006 ± 0,01
2 0,01 ± 0,01 ± 0,02
5 0,01 ± 0,01 ± 0,02
5 0,02 ± 0,01 ± 0,02
10 0,02 ± 0,02 ± 0,05
10 0,05 ± 0,03 ± 0,05
25 0,05 ± 0,03 ± 0,05
25 0,10 ± 0,05 ± 0,10
50 0,10 ± 0,05 ± 0,10
100 0,20 ± 0,10 ± 0,20
6.2 If burettes are required with nominal capacities and/or subdivisions other than those listed in Table 1,
they shall conform to the essential requirements of this International Standard.
The rela
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