EN ISO 295:1998
(Main)Plastics - Compression moulding of test specimens of thermosetting materials (ISO 295:1991)
Plastics - Compression moulding of test specimens of thermosetting materials (ISO 295:1991)
Kunststoffe - Pressen von Probekörpern aus duroplastischen Werkstoffen (ISO 295:1991)
In dieser Internationalen Norm werden die allgemeinen Grundsätze und Verfahren für die Herstellung von Probekörpern aus duroplastischen Formmassen durch Pressen und Wärme und Druck sowie für die Erstellung vergleichbarer Prüfberichte unterschiedlicher Prüflaboratorien beschrieben. Diese Norm gilt nur für duroplatische Formmassen auf der Basis von Phenol (ISO 800), Harnstoff und Melamin (ISO 2112), Melamin-Phenol (ISO 4896), Epoxiden und ungesättigten Polyestern.
Plastiques - Moulage par compression des éprouvettes en matières thermodurcissables (ISO 295:1991)
Polimerni materiali - Stiskanje duromernih preskušancev (ISO 295:1991)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 295:2000
01-maj-2000
Polimerni materiali - Stiskanje duromernih preskušancev (ISO 295:1991)
Plastics - Compression moulding of test specimens of thermosetting materials (ISO
295:1991)
Kunststoffe - Pressen von Probekörpern aus duroplastischen Werkstoffen (ISO
295:1991)
Plastiques - Moulage par compression des éprouvettes en matieres thermodurcissables
(ISO 295:1991)
Ta slovenski standard je istoveten z: EN ISO 295:1998
ICS:
83.080.10 Duromeri Thermosetting materials
SIST EN ISO 295:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 295:2000
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SIST EN ISO 295:2000
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SIST EN ISO 295:2000
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SIST EN ISO 295:2000
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SIST EN ISO 295:2000
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SIST EN ISO 295:2000
INTERNATIONAL
STANDARD
Second edition
1991-l l-01
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Plastics - Compression moulding of test
specimens of thermosetting materials.
Plastiques - Moulage pat- compression des &proweffes en mat&-es
thermodurcissables
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Reference number
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IS0 295:1991(E)
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SIST EN ISO 295:2000
IS0 295:1991(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
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, govern-
mental and non-governmental, in liaison with ISO, also take part in the
work. IS0 collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electratechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an lnter-
national Standard requires approval by at least 75 % of the member
bodies casting a vote.
International Standard IS0 295 was prepared by Technical Committee
ISO/TC 61, Plastics, Sub-Committee SC 12, Thermosetting materials.
This second edition cancels and replaces the first edition
(IS0 295:1974), of which it constitutes a technical revision.
0 IS0 1991
All rights reserved. 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 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii
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SIST EN ISO 295:2000
INTERNATIONAL STANDARD IS0 295:1991 (E)
Plastics - Compression moulding of test specimens of
thermosetting materials.
._
IS0 4683982. Surface roughness - Parameters, theil
1 Scope
values and ~ qeneral k rules for specifying
requirements.
This International Standard specifies the general
principles and the procedures to be followed for the
IS0 800: -2) Plastics --- Fhenolic morllding maierials
preparation of test specimens from thermosetting
- Specificaiion.
compounds moulded under heat and pressure and
for the establishment of comparable test reports
IS0 1183:1987, Plastics --- Methods for determining
from different testing organizations. It is applicable
the density and relative dwsity of non-cellular plas-
only to thermosetting materials based upon
tics.
phenolics (IS0 800), aminoplastics (IS0 2112),
melamine phenolics (IS0 4896), epoxides and un-
IS0 2112:1990, Plastics -- Aminoplastic moulding
saturated polyesters.
materials - Specification.
Because the properties of the specimens moulded
IS0 3167: 1983, Plastics - Preparation and use of
from thermosetting materials depend on the condi-
multipurpose test specimens.
tions of preparation of the specimens, this lnter-
national Standard also specifies the details of
IS0 4896: 1990, Plastics --- Melamir~elphenolic mould-
specimen preparation to be included with test re-
ing materials .--. Specification.
ports of the properties of such specimens.
It may often be necessary to prepare specimens by
special methods because of their composition, their
flow properties or other variable factors. In this
case, an agreement shall be made between the in-
terested parties. The tables giving the specimen 3 Definitions
properties shall refer to these specific methods.
For the purposes of this International Standard, the
following definitions apply.
3.1 deviations of temperature in position: Devi-
ations of temperature existing simultaneously be-
2 Normative references
tween various points inside the mould after the
temperature adjustment device has been set at a
The following standards contain provisions which,
given temperature and after a permanent thermal
through reference in this text, constitute provisions
equilibrium has been reached.
of this International Standard. At the time of publi-
cation, the editions indicated were valid. All stan-
dards are subject to revision, and parties to 3.2 deviations of temperature in time: Deviations of
agreements based on this International Standard temperature that may occur at a single given point
are encouraged to investigate the possibility of ap-
on the inside of the mould at various times after the
plying the most recent editions of the standards in-
temperature adjustment device has been set at a
dicated below. Members of IEC and IS0 maintain
given temperature and after a permanent thermal
registers of currently valid International Standards.
equilibrium has been reached.
1) To be published. (Revision of IS0 800: 1977)
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SIST EN ISO 295:2000
IS0 295:1991(E)
The edge taper angle shall not be greater than 3O
4 Apparatus
(see figure 1). Clearance between the vertical wall
of the cavity and the punch shall be not greater than
0,l mm (see figure 1).
4.1 Compression mould, made of steel, able to
withstand the specified temperatures and pressures.
The mould shall have a loading chamber (see
The mould shall be designed so that the com-
figure 1) large enough to allow the whole charge to
pression force is transmitted to the moulding mate-
be fed in one operation. Moulding material in bulk
rial with no appreciable loss. It may be of a
form is from 2 to 10 times as voluminous as the
single-cavity or a multi-cavity type. Figure 1 shows
moulded object.
an example of a single-cavity positive mould. The
cavity of the mould may have the shape of the
The mould may be fitted with an ejector. If ejector
multi-purpose test specimen described in IS0 3167. pins are used [see the example in figure 2a)], they
In some cases (aminoplastics for instance), a semi- shall not deform the specimen in any way. If the
positive mould is more suitable, even though the
parts are ejected by the movable bottom of the
pressure on the moulding material is not as well
mould [see the example in figure2b)J there shall
defined. In this case, the specimen thickness shall
be no significant leakage of material at the joint be-
be adjusted using spacers on the mould parting line.
tween the bottom and the cavity wall.
The mould surface shall be free from superficial Because the face of the moulded part facing the
damage or contamination and have a shiny surface lower die is heated for a longer time during the pe-
riod between filling and compression, it may be
finish of I?,, 0,4 p.m to 0,8 pm (see IS0 468). Chrome
plating is not always necessary, but it will prevent useful to distinguish between the two faces by
sticking. means of a fixed mark in the cavity.
Dimensions in millimetres
Holes for probes and thermometers
n
I-- Cavlty
NOTE - Dimension e’ shall be calculated so that there is no risk of the piston damaging the die if there is no material
present.
Figure 1 - Example of single-cavity positive mould
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SIST EN ISO 295:2000
IS0 295:1991(E)
a) With electors
Movable bottom
b) Wlth eJectIon by movable bottom
Figure 2 - Examples of moulds
3
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SIST EN ISO 295:2000
IS0 295:1991(E)
4.2 Heating device, capable of heating the mould 4.5 Stopwa tch, capable of b&q read to an accu-
,
so that the moulding temperature remains constant racy of 1 s.
and uniform over all parts of the mould within the
specified tolerances.
46 . Mould temperature 1 measurem lent device, such
as a eter or fusibl e salts.
The mould may be heated either through the platen PYrom
or by means of a built-in device (for example, circu-
lating fluid or electric heating elements). In the latter
4.7 Balance, having an accuracy of 0.1 gS
\
case, the mould shall be insulated from the press
platens .with a sheet of insulating material. For
practical reasons, it is generally preferable to heat
4.8 Metal plate, about 20 mm thick and havinq at
the mould elec
...
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