SIST EN ISO 1042:2000

SLOVENSKI STANDARD
01-junij-2000
1DGRPHãþD
SIST ISO 1042:1995
SIST ISO 1042:1998
Laboratorijska steklovina - Volumetrijske steklenice z eno oznako (ISO 1042:1998)
Laboratory glassware - One-mark volumetric flasks (ISO 1042:1998)
Laborgeräte aus Glas - Meßkolben (ISO 1042:1998)
Verrerie de laboratoire - Fioles jaugées a un trait (ISO 1042:1998)
Ta slovenski standard je istoveten z: EN ISO 1042:1999
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 1042
Fourth edition
1998-07-01
Laboratory glassware — One-mark
volumetric flasks
Verrerie de laboratoire — Fioles jaugées à un trait
A
Reference number
ISO 1042:1998(E)
ISO 1042:1998(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.
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.
ISO 1042 was developed by Technical Committee ISO/TC 48, Laboratory
glassware and related apparatus, Subcommittee SC 1, Volumetric
instruments.
This fourth edition cancels and replaces the third edition (ISO 1042:1983)
by incorporating the following changes:
a) flasks with capacities of 1, 2, 20 and 5 000 ml have been added;
b) flasks with conical body shape have been added;
c) flasks with wider neck have been added;
d) material has been more precisely defined and a test method for
capacity introduced;
e) sizes of ground joints have been added in tables 1 and 2.
©  ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet central@iso.ch
X.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
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©
ISO ISO 1042:1998(E)
Introduction
Volumetric flasks together with analytical balances are the fundamental
tools for the preparation of volumetric standard solutions – the basis of
chemical analysis. The design of narrow-necked class A volumetric flasks
has been optimized to achieve the fewest possible acceptable errors.
With the increasing popularity of piston-operated pipettors, there is market
pressure for the manufacture of volumetric flasks with wider necks so that
pipettor tips may be inserted to remove solution directly. Wide-necked
flasks will of necessity be of lower accuracy than the corresponding
capacities of narrow-necked flasks and the insertion of any extraneous
device may introduce other errors.
It is therefore recommended that narrow-necked class A volumetric flasks
are used for the production of standard solutions and where necessary, a
suitable quantity should be poured into an intermediate vessel into which
the pipettor tip may be introduced.
In accordance with good laboratory practice, only narrow-necked class A
volumetric flasks conforming to this International Standard should be used
for precise analytical purposes.
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©
INTERNATIONAL STANDARD  ISO ISO 1042:1998(E)
Laboratory glassware — One-mark volumetric flasks
1  Scope
This International Standard specifies requirements for an internationally acceptable series of one-mark volumetric
flasks, suitable for general laboratory purposes.
The specifications in this International Standard are in conformity with ISO 384 and with OIML Recommendation
No. 4.
2  Normative references
The following standards contain provisions which, through references in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain
registers of currently valid International Standards.
ISO 383:1976, Laboratory glassware — Interchangeable conical ground joints.
ISO 719:1985, 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  Basis of adjustment
3.1  Unit of volume
The unit of volume shall be the millilitre (ml) which is equivalent to the cubic centimetre (cm ).
NOTE —  The term millilitre (ml) is commonly used as a special name for the cubic centimetre (cm ), in accordance with a
decision of the twelfth Conférence Générale des Poids et Mesures. The term millilitre is acceptable, in general, for references
in International Standards to capacities of volumetric glassware and it is used, in particular, in the present text.
3.2  Reference temperature
The standard reference temperature, i.e. the temperature at which the volumetric flask is intended to contain its
nominal volume (nominal capacity), shall be 20 °C.
When the flask is required for use in a country which has adopted a standard reference temperature of 27 °C,
however, this value shall be substituted for 20 °C.
©
ISO
ISO 1042:1998(E)
4  Classes of accuracy
Two classes of accuracy are specified:
 Class A for the higher grade,
 Class B for the lower grade.
5  Series of capacities
The series of nominal capacities of one-mark volumetric flasks is as follows (in millilitres):
1 - 2 - 5 - 10 - 20 - 25 - 50 - 100 - 200 - 250 - 500 - 1 000 - 2 000 - 5 000
All these flasks may be finished with a plain neck or may include a stopper.
NOTE —  If volumetric flasks of capacities other than those listed above are required, it is recommended that they conform, as
far as possible, to the essential requirements of this International Standard.
6  Definition of capacity
The capacity of a volumetric flask is defined as the volume of water at 20 °C, expressed in millilitres, contained by
the flask at 20 °C, when filled to the graduation line.
Where, exceptionally, the reference temperature is 27 °C, this value shall be substituted for 20 °C.
Setting the meniscus shall be performed according to ISO 4787:
The meniscus is set so that the plane of the top edge of the graduation line is horizontally tangential to the lowest
point of the meniscus, the line of sight being in the same plane.
7  Accuracy
The capacity of the flasks shall not differ from the nominal capacity by more than the maximum permitted errors
shown in tables 1 and 2.
8  Construction
8.1  Material
Volumetric flasks shall be made from glass of hydrolytic class not lower than HGB3 in accordance with ISO 719 with
-6 -1
a coefficient of thermal expansion not exceeding 3,3 x 10 °C .
NOTE —  Borosilicate glass 3.3 in accordance with ISO 3585 is included in this requirement.
The glass shall be as free as possible from visible defects and reasonably free from internal stress, which would
impair the performance of the flasks.
8.2  Wall thickness
Volumetric flasks shall be sufficiently robust in construction to with
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