Plastics -- Compression moulding test specimens of thermosetting materials

Matières plastiques -- Moulage par compression des éprouvettes en matières thermodurcissables

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ISO 295:1974 - Plastics -- Compression moulding test specimens of thermosetting materials
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Plastics - Compression moulding test specimens of
thermosetting materials

Matières plastiques - Moulage par Compression des éprouvettes en matières thermodurcissables

First edition - 1974-12-01
UDC 678.072 : 620.1 15 Ref. No. IS0 295-1974 (E)

Descriptors : plastics, thermosetting resins, test specimens, test specimen conditioning, moulding, compression moulding, aminoplasts,

Price based on 5 pages
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IS0 (the International Organization for Standardization) is a worldwide federation

of national standards institutes (IS0 Member Bodies). The work of developing
International Standards is carried out through IS0 Technical Committees. Every
Member Body interested in a subject for which a Technical Committee has been set

up has the right to be represented on that Committee. International organizations,

governmental and nongovernmental, in liaison with ISO, also take part in the work.

Draft International Standards adopted by the Technical Committees are circulated
to the Member Bodies for approval before their acceptance as International
Standards by the IS0 Council.
International Standard 295 was drawn up by Technical Committee ISO/TC 61,

Plastics. It was submitted directly to the IS0 Council, in accordance with clause

6.1 2.1 of the Directives for the technical work of KO.
This International Standard cancels and replaces IS0 Recommendation
R 295-1963, as well as the Annexes A, B and C.
ISO/R 295 had been approved by the Member Bodies of the following countries :
Australia India Romania
Austria Israel Spain
Belgium ltalv Sweden
Burma Japan Switzerland
Chile Mexico United Kingdom
Czechoslovakia Netherlands U.S.A.
Germany Poland U.S.S. R.
Hungary Port uga I
The Member Body of the following country had expressed disapproval of the
Recommendation :
Annex A to ISO/R 295 had been approved by the Member Bodies of the following
countries :
Hungary Poland
India Romania
Iran South Africa, Rep. of
Israel Spain
Bu I ga r ia
Italy Sweden
Japan Switzerland
Korea, Dem. P. Rep. of Turkey
Egypt, Arab Rep. of
Korea, Rep. of United Kingdom
Netherlands U.S.A.
Greece New Zealand Yugoslavia
No Member Body had expressed disapproval of the document.
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Annex B had been approved by the Member Bodies of the following countries :
Austria Iran South Africa, Rep. of
Belgium Israel Spain
Brazil Japan Sweden
Czechoslova kia Korea, Rep. of Switzerland
Netherlands Turkey
Egypt, Arab Rep, of
Poland United Kingdom
Hungary Portugal U.S.A.
India Romania U.S.S. R.
The Member Body of the following country had expressed disapproval of the
document :
Annex C had been approved by the Member Bodies of the following countries :
Belgium Israel Spain
Brazil Japan Sweden
Czechoslovakia Korea, Rep. of Switzerland
Egypt, Arab Rep. of Netherlands Turkey
Germany Poland United Kingdom
Hungary Portuga I U.S.A.
India Romania U.S.S. R.
Iran South Africa, Rep. of
The Member Bodies of the following countries had expressed disapproval of the
O International Organization for Standardization, 1974
Printed in Switzerland
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IS0 295-1974 (E)
Plastics - Compression moulding test specimens of
thermosetting materials
2.1.1 Ejectorpin
This International Standard is intended to serve as a basis
In order to ensure the preparation of plane or flat moulded

for ensuring the preparation of equivalent test specimens shapes without subsequent distortion, it is preferred that

from identical thermosetting compounds moulded under they be ejected from the mould with the entire mould

heat and pressure and the submission of equivalent and bottom. Ejector pins may be used, if equivalent results can

comparable statements in the reports issued by different be obtained.
't testing organizations. This recommended practice applies
only to thermosetting moulding materials such as
1 In order to facilitate the removal of the moulded shapes from the
phenoplasts, aminoplasts and polyesters and epoxy
mould, it is permissible to design the mould walls with a draft
moulding compounds.
(taper) of not more than
This International Standard, therefore, contains a general
2 Pronounced flashing is associated with a correspondingly strong
test Specimens

outline regarding the equipment and the normal methods of local flow of moulding compound, resulting in

exhibiting partly deformed shapes and deviating properties.
preparation of test specimens, as well as the particulars to
be included in the reports concerning the preparation of the
specimens. Complementary details concerning phenolic,
2.1.2 Temperature control device
aminoplastic, and polyester and epoxy resin moulding
materials are given in annexes.
Moulds shall be provided with efficient heat regulation so
that the optimum temperatures required can be maintained
In many cases, special procedures covering the preparation
constant within a range of
3 OC in all sections of the
of the test specimens may be necessary depending on
mould; i.e. the mould temperature shall not deviate from
composition, flow properties and other variables. Such
the nominal temperature in temporal and spatial respects' )
procedures should be made part of the procurement
by more than +_ 3 OC.
specifications, or agreed upon between seller and purchaser.
test specimens
Tables of the characteristic properties of
Bore-holes for the introduction of pyrometric or
should include reference to such special procedures.
thermometric heat-measuring devices shall be provided in
the three main parts of the moulds. The surface of the
mould walls shall be polished and may be chromium plated
if necessary. The compression face of the lower die shall
carry a mark indicating on the moulded shape the surface
2.1 Compression mould
which has been formed by the lower die. Care shall be
taken to ensure that such marks do not interfere with
This moulding tool shall be designed and constructed so
subsequent testing.
that the force of compression is transmitted to the plastics
without appreciable losses until the conclusion of the
compression cycle. A three-part mould consisting of a shell
1 The two main surfaces of test specimens are not exactly
and an upper and a lower die has been found satisfactory
equivalent with regard to all their properties, since, during the
for this purpose. Other moulds may be used, where it can
period between filling and compacting, the surface of the shape
be shown that equivalent results are obtained.
directed toward the lower die is heated longer and to a higher
It rnay therefore be advisable in
temperature than the other surface.
The dimensions of the mould cavity shall be such that the
preparing test methods, specifications, property tables, etc., to state

compound can be introduced in one single charge. It rnay the particular surface to which specifications or properties should be

be necessary however, especially for bulky materials, to
agree on a method of tabletting prior to introduction into
2 Standardization of moulding tools of specific design is in
the mould.

1 ) spatial temperature differences : Differences of temperature existing simultaneously at various points of the interior of the moulds after the

temperature control has been definitely fixed and a state of permanent thermal equilibrium attained.

temporal temperature deviations : Deviations of temperature which may occur at one and the same point of the interior of the mould at

different times after the temperature control has been definitely fixed and a state of permanent thermal equilibrium attained.

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IS0 295-1974 (E)

2.2 Compression moulding press 4.2 The period of time elapsing between the filling of the

mould and the application of pressure shall be as short as
Any press capable of exerting and maintaining the pressure
prescribed for the particular material being moulded for
the required time and within the prescribed tolerances is I
4.3 If, breathing of the mould is necessary, this shall be
suitable for this purpose.
2.3 Heating device
4.4 Burrs may be removed from the finished test
specimens, but care shall be taken to avoid damaging the
as to ensure
The moulds shall be heated in such manner
moulded skin in any other way. All work of this type shall
uniform and constant moulding temperatures within the
be carried out in the longitudinal direction of the test
range of tolerances stated in 2.1.2. They may be heated
specimens. As a rule, the specimens should be tested
from press platens and/or heaters inserted in the mould or
without further finishing treatments.
mould parts, or by heating fluids circulating in suitable
passageways in the mould, or by any other convenient
4.5 If, in special instances, finishing treatments are
required, these shall be subject to mutual agreement
between seller and purchaser. Unless otherwise specified in
materials specifications, the time from moulding to
conditioning shall not be less than 16 h.
3.1 Unless otherwise required by the material
specifications, moulding materials shall be pressed as
3.2 In the case of referee tests, unless otherwise agreed,
The report shall include the following particulars :
the moulding materials shall be conditioned for 72 h over a
desiccant, for example anhydrous calcium chloride,
immediately prior to moulding. Where moulding materials
a) date and location of test specimen preparation;
are SO bulky that conventional moulds have insufficient
loading capacity, the materials may be pre-compressed
b) moulding compound (type, designation, approx-
(tabletted). The tabletting conditions shall be determined
imate date of manufacture, conditioning treatment, if
by agreement between seller and purchaser.
4 PROCEDURE c) mould (construction, surface, type of heating);

4.1 Mould release agents, i.e. substances designed to facili- d) press (manufacturer's mark, type, capacity);

tate the opening of the moulds, may be employed only if

such substances have been proved to exert no influence on e) operating conditions (kind of preliminary treatment,

the properties of the test specimens produced. This temperature of mould, kinds of temperature-measuring

specification applies particularly if the specimens have to be instruments employed, pressure, time and any other

tested for electrical properties or freedom from taste and procedures of probable significance such as mould

odor. ventilation (breathing), etc.).
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IS0 295-1974 (E)
All parts of the inner surfaces of the mould shall
This annex describes the moulds and moulding conditions
preferably be maintained at a temperature of 160 f 3 OC.
for c

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