SIST EN ISO 75-2:2004

SLOVENSKI STANDARD
SIST EN ISO 75-2:2004
01-oktober-2004
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SIST EN ISO 75-2:2000
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Plastics - Determination of temperature of deflection under load - Part 2: Plastics, ebonite
and long-fibre-reinforced composites (ISO 75-2:2004)
Kunststoffe - Bestimmung der Wärmeformbeständigkeitstemperatur - Teil 2: Kunststoffe,
Hartgummi und langfaserverstärkte Kunststoffe (ISO 75-2:2004)
Plastiques - Détermination de la température de fléchissement sous charge - Plastiques,
ébonite et composites renforcés de fibres longues (ISO 75-2:2004)
Ta slovenski standard je istoveten z: EN ISO 75-2:2004
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
SIST EN ISO 75-2:2004 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 75-2:2004

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SIST EN ISO 75-2:2004

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SIST EN ISO 75-2:2004

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SIST EN ISO 75-2:2004


INTERNATIONAL ISO
STANDARD 75-2
Second edition
2004-05-15


Plastics — Determination of temperature of
deflection under load —
Part 2:
Plastics and ebonite
Plastiques — Détermination de la température de fléchissement sous
charge —
Partie 2: Plastiques et ébonite




Reference number
ISO 75-2:2004(E)
©
 ISO 2004

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SIST EN ISO 75-2:2004
ISO 75-2:2004(E)
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©  ISO 2004
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ii © ISO 2004 – All rights reserved

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SIST EN ISO 75-2:2004
ISO 75-2:2004(E)
Contents Page
Foreword . iv
Introduction. v
1 Scope. 1
2 Normative references. 1
3 Terms and definitions. 2
4 Principle . 2
5 Apparatus. 2
6 Test specimens . 2
7 Conditioning . 3
8 Procedure (flatwise testing) . 3
9 Expression of results. 4
10 Precision . 4
11 Test report. 5
Annex A (normative) Testing in the edgewise position. 6
Annex B (informative) Precision . 8
Bibliography. 10

© ISO 2004 – All rights reserved iii

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SIST EN ISO 75-2:2004
ISO 75-2:2004(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 75-2 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 2, Mechanical properties.
This second edition cancels and replaces the first edition (ISO 75-2:1993), which has been technically revised.
ISO 75 consists of the following parts, under the general title Plastics — Determination of temperature of deflection
under load:
 Part 1: General test method
 Part 2: Plastics and ebonite
 Part 3: High-strength thermosetting laminates and long-fibre-reinforced plastics
Annex A forms a normative part of this part of ISO 75. Annex B is for information only.
iv © ISO 2004 – All rights reserved

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SIST EN ISO 75-2:2004
ISO 75-2:2004(E)
Introduction
ISO 75-1:1993 and ISO 75-2:1993 described three methods (A, B and C) using different test loads and two
specimen positions, edgewise and flatwise. For testing in the flatwise position, test specimens with dimensions
80 mm × 10 mm × 4 mm were required. These can be moulded directly or machined from the central section of the
multipurpose test specimen (see ISO 3167). These “ISO bars” cannot be easily used in the edgewise position,
because this would require both a reduction in span and an increase in test load by the same factor, and this may
be impossible to achieve on existing instruments for edgewise testing. Specimens for testing in the edgewise
position are less closely specified. Using the 80 mm × 10 mm × 4 mm ISO bar has the following advantages:
 Thermal expansion of the test specimen has less influence on the test result.
 Draft angles do not influence the test result. The specimen does not stand “on edge”.
 The moulding parameters and the specimen dimensions are specified more closely.
This increases the comparability of the test results. Therefore, it was decided that the possibility of testing in the
edgewise position would be deleted from the standard. In order to provide a sufficient transition period, in this
edition the flatwise position is described as the preferred and recommended one, while testing in the edgewise
position is optional and has been moved to a normative annex (in this part of ISO 75). This annex and all other
references to edgewise testing will be deleted on occasion of the next revision of this document.
Earlier editions of this International Standard allowed methods other than using a heating bath for heating the test
specimen, namely forced-circulation ovens or fluidized beds. None of these alternative methods is widely used and
no proven instruments are commercially available. Furthermore, there is no general comparability between tests
using different heating methods due to the differences in the heat transfer characteristics and the temperature
control methods described in this standard.
Therefore only heating in heating baths is allowed in this edition.
In order to maintain consistency with ISO 10350-1:1998, T has been used as the symbol for temperature of
f
deflection under load.

© ISO 2004 – All rights reserved v

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SIST EN ISO 75-2:2004

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SIST EN ISO 75-2:2004
INTERNATIONAL STANDARD ISO 75-2:2004(E)

Plastics — Determination of temperature of deflection under
load —
Part 2:
Plastics and ebonite
1 Scope
This part of ISO 75 specifies three methods, using different values of constant flexural stress, that can be used for
the determination of the temperature of deflection under load of plastics (including filled plastics and fibre-
reinforced plastics in which the fibre length, prior to processing, is up to 7,5 mm) and ebonite:
 method A, using a flexural stress of 1,80 MPa;
 method B, using a flexural stress of 0,45 MPa;
 method C, using a flexural stress of 8,00 MPa.
The standard deflection ∆s used to determine the temperature of deflection under load corresponds to a flexural-
strain increase ∆ε defined in this part of ISO 75. The initial flexural strain due to the loading of the specimen at
f
room temperature is neither specified nor measured in this part of ISO 75. The ratio of this flexural-strain difference
to the initial flexural strain depends on the modulus of elasticity, at room temperature, of the material under test.
This method is therefore only suitable for comparing the temperatures of deflection of materials with similar room-
temperature elastic properties.
NOTE The methods give better reproducibility with amorphous plastics than with semi-crystalline ones. With some
materials, it may be necessary to anneal the test specimens to obtain reliable results. Annealing procedures, if used, generally
result in an increase in the temperature of deflection under load (see 6.6).
For additional information, see ISO 75-1:2004, clause 1.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references,
only
...