ISO 5215:2022

INTERNATIONAL ISO
STANDARD 5215
First edition
2022-05
Laboratory plastic ware — Volumetric
flasks
Matériel en plastique de laboratoire — Fioles jaugées
Reference number
© ISO 2022
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Volume and reference temperature . 1
4.1 Unit of volume . 1
4.2 Reference temperature . 1
5 Classes of accuracy . 2
6 Series of capacities.2
7 Definition of capacity .2
8 Accuracy and testing of volume . 2
9 Construction . 2
9.1 Material . 2
9.2 Wall thickness . 3
9.3 Shape . 3
9.4 Neck . 3
9.5 Stoppers and threads . 3
9.6 Dimensions . 3
10 Graduation line . 4
11 Marking and designation . 4
11.1 General . 4
11.2 Identification number . 4
12 Visibility of graduation line, figures and marking . 4
Annex A (normative) Alternative shapes and closures of volumetric flasks .5
Annex B (informative) Closures — Knuckle threads (GL). 8
Bibliography .11
iii
Foreword
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iv
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 class A volumetric flasks
has been optimized to achieve the fewest possible acceptable errors.
Class A volumetric flasks are used for the production of standard solutions and where necessary, a
suitable quantity is poured into an intermediate vessel into which a pipette tip may be introduced.
In accordance with good laboratory practice, only class A volumetric flasks conforming to this document
should be used for precise analytical purposes.
v
INTERNATIONAL STANDARD ISO 5215:2022(E)
Laboratory plastic ware — Volumetric flasks
1 Scope
This document sets out requirements for the construction of general laboratory volumetric flasks made
of plastic material.
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.
ISO/IEC Guide 99, International vocabulary of metrology — Basic and general concepts and associated
terms (VIM)
ISO 383, Laboratory glassware — Interchangeable conical ground joints
ISO 384:2015, Laboratory glass and plastics ware — Principles of design and construction of volumetric
instruments
ISO 1043-1, Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special
characteristics
ISO 4787, Laboratory glass and plastic ware — Volumetric instruments — Methods for testing of capacity
and for use
DIN 168-1, Knuckle threads — Part 1: Especially for glass containers; thread sizes
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC Guide 99 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Volume and reference temperature
4.1 Unit of volume
The unit of volume shall be the millilitre (ml), which is equivalent to the cubic centimetre (cm ).
4.2 Reference temperature
The standard reference temperature, i.e. the temperature at which the volumetric flask is intended to
contain or deliver its volume (capacity), shall be 20 °C.
When the volumetric flask is required for use in a country which has adopted a standard reference
temperature of 27 °C, this value shall be substituted for 20 °C.
5 Classes of accuracy
Two classes of accuracy are specified:
— class A for the higher grade of accuracy;
— class B for the lower grade of accuracy.
6 Series of capacities
The series of nominal capacities of volumetric flasks is as follows (in millilitres):
10 – 25 – 50 – 100 – 250 – 500 – 1 000
All these flasks may be finished with a thread or may include a stopper.
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 document. A cross-check with
ISO 384 is recommended since, in particular, error li
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