SIST ISO 9853:1995

Injection-moulded unplasticized poly(vinyl chloride) (PVC-U) fittings for pressure pipe systems -- Crushing test

Raccords moulés en poly(chlorure de vinyle) non plastifié (PVC-U) pour canalisations avec pression -- Essai à l'écrasement

Brizgani fitingi iz nemehčanega polivinilklorida (PVC - U) za tlačne cevne sisteme - Preskus s stiskanjem

General Information

• Status: Published
• Publication Date: 31-Oct-1995
• ICS: 23.040.45 - Plastics fittings
• Technical Committee: PCV - Plastic pipes, fittings and valves
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Nov-1995
• Due Date: 01-Nov-1995
• Completion Date: 01-Nov-1995
• Ref Project: ISO 9853:1991 - Injection-moulded unplasticized poly(vinyl chloride) (PVC-U) fittings for pressure pipe systems - Crushing test

Overview

SIST ISO 9853:1995 specifies a standardized crushing test for injection-moulded unplasticized poly(vinyl chloride) (PVC-U) fittings used in pressure pipe systems. The standard aims to assess the resistance and deformation behavior of PVC-U pipe fittings under compressive loads to ensure quality and safety in fluid transport applications.

Developed by ISO Technical Committee ISO/TC 138, which focuses on plastic pipes, fittings, and valves for fluid transport, this standard defines the test method to evaluate the percentage deformation of PVC-U fittings without cracks or rupture, thereby verifying the absence of critical residual stresses from the molding process.

Key benefits of compliance with ISO 9853 include improved reliability of pressure pipe systems and assurance that fittings will withstand mechanical crushing forces during installation and operation.

---

Key Topics

• Scope
  Applies to PVC-U injection-moulded fittings for pressure pipe systems with solvent weld or rubber ring joints, conforming to related ISO standards such as ISO 264 (pressure pipes), ISO 727 (PVC-C / ABS fittings), and ISO 2048 (fittings with elastomeric seals).

• Crushing Test Principle
  The method consists of placing the fitting between two press platens and applying a force at a constant speed (50 mm/min) to achieve a specific percentage deformation (X). The distance between press platens is measured before and during deformation to calculate X.

• Deformation Calculation
  Percentage deformation X = ((h₀ - h₁) / h₀) × 100
  where h₀ = initial distance between press plates and h₁ = distance at deformation X.

• Test Equipment
  Mechanical or hydraulic press capable of controlled force application and platen movement at prescribed speeds. Supports may be used for fittings with rubber ring joints to ensure uniform force distribution.

• Specimen Preparation

  • Use injection-molded, untreated fittings without bonding or transformation.
  • Test specimens conditioned at 23°C ± 2°C for at least 2 hours.
  • Remove rubber seals if present prior to testing.

• Test Procedure

  • Position specimens with axis parallel to press platens.
  • Apply compressive force until deformation percentage X is reached or fitting fails.
  • Record force applied, deformation distance, and note any cracking, splitting, or rupture details.

• Acceptance Criteria
  The base specification recommends no breakage or cracking at a deformation level of 20%. More stringent requirements may be applied for special applications.

---

Applications

SIST ISO 9853:1995 is essential for manufacturers, quality control laboratories, and regulatory bodies involved with:

• Production and quality assurance of PVC-U pressure pipe fittings used in water distribution, sewage systems, and industrial fluid transport.
• Evaluation of injection molding quality to detect internal residual stresses that can weaken fittings under crushing loads.
• Ensuring compliance with safety standards to prevent leaks or catastrophic failure in pressure piping networks.
• Supporting product certification processes requiring mechanical integrity testing of plastic fittings.

This standard helps engineers and installers select fittings that maintain structural integrity during handling, installation, and operation under pressure conditions.

---

Related Standards

ISO 9853 references and complements several key international standards for plastic pipes and fittings, including:

• ISO 264: Unplasticized PVC pressure pipes - dimensions and fitting connections.
• ISO 727: Molded fittings of PVC-C and ABS for pressure pipelines.
• ISO 2048: PVC-U fittings with elastomeric seals - minimum socket depths for joints.

These related standards define material characteristics, dimensional requirements, and joint types that align with the test method and acceptance criteria in ISO 9853.

---

By adhering to SIST ISO 9853:1995, stakeholders ensure that injection-moulded PVC-U fittings in pressure pipe systems meet internationally recognized mechanical resilience standards, thereby enhancing the safety, durability, and performance of critical fluid transport infrastructure.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-1995
%UL]JDQLILWLQJLL]QHPHKþDQHJDSROLYLQLONORULGD39&8]DWODþQHFHYQHVLVWHPH
3UHVNXVVVWLVNDQMHP
Injection-moulded unplasticized poly(vinyl chloride) (PVC-U) fittings for pressure pipe
systems -- Crushing test
Raccords moulés en poly(chlorure de vinyle) non plastifié (PVC-U) pour canalisations
avec pression -- Essai à l'écrasement
Ta slovenski standard je istoveten z: ISO 9853:1991
ICS:
23.040.45 Fitingi iz polimernih Plastics fittings
materialov
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

IS0
INTERNATIONAL
STANDARD 9853
First edition
199 1-07-o 1
Injection-moulded unplasticized poly(vinyl
chloride) (PVC-U) fittings for pressure pipe
systems - Crushing test
Raccords mod& en poly(chlorure de viny/e) non plasMi (PVC-U) pour
canalisations avec pression - Essai ;i I’&rasement
-- ----_ _ -
_____ ____-____________ --------.-___----~----------.---_____I
L--.-d--
-- -~-
--
Reference number
IS0 9853:1991(E)
IS0 9853:1991(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 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, 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 electrotechnical 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 9853 was prepared by Technical Committee
ISO/TC 138, Plastics pipes, fittings and valves for the transport of f7uids.
Annexes A and B of this International Standard are for information only.
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 Genkve 20 l Switzerland
Printed in Switzerland
ii
IS0 9853:1991(E)
Introduction
Injection-moulded unplasticized poly(vinyl chloride) fittings can be
crushed without their failing if they contain no residual stresses as a
result of the moulding process. However, if these residual stresses are
too great, the fitting will fail when a crushing force is applied.
The percentage deformation of a fitting, in relation to its initial diameter,
constitutes a simple criterion for the selection of fittings having an ac-
ceptable level of internal stresses.
. . .
III
This page intentionally left blank

-~-~. -
INTERNATIONAL STANDARD IS0 9853:1991(E)
Injection-moulded unplasticized poly(vinyl chloride) (PVC-U)
fittings for pressure pipe systems - Crushing test
NOTE 1 For a given percentage deformation X, the dis-
1 Scope
tance h, is calculated as follows:
Ml - Jo
This International Standard specifies a crushing test
j+--
. . .
(2)
the percentage deformation of 100
to determine
injection-moulded unplasticized poly(vinyl chloride)
(PVC-U) fittings and recommends a basic specifi-
cation (see annex A).
3 Principle
It applies to injection-moulded PVC-U fittings
The fitting to be tested is inserted between the two
plates of an appropriate press. The force necessary
I_ for pressure pipelines, in accordance with
to give a percentage deformation X is applied at a
IS0 264;
constant speed of 50 mm/min. The fitting is exam-
- ined to determine whether it has fractured and, if so,
with solvent sockets, in accordance with IS0 727;
the type of fracture.
-
with sockets with elastomeric sealing rings, in
accordance with IS0 2048.
4 Apparatus
The apparatus consists essentially of the following
elements.
2 Definition
4.1 Press, operated mechanically or hydraulically,
capable of applying a sufficient force to carry out the
For the purposes of this International Standard, the
test, with a closing speed of the plates that can be
following definition applies.
controlled to 50 mm/min + 5 mm/min. See figure 1
for an example.
percentage deformation X The change in diameter
of a fitting, in relation to its initial diameter, deter-
4.2 Appropriate supports, to permit the application
mined by using the crushing test
...

IS0
INTERNATIONAL
STANDARD 9853
First edition
199 1-07-o 1
Injection-moulded unplasticized poly(vinyl
chloride) (PVC-U) fittings for pressure pipe
systems - Crushing test
Raccords mod& en poly(chlorure de viny/e) non plasMi (PVC-U) pour
canalisations avec pression - Essai ;i I’&rasement
-- ----_ _ -
_____ ____-____________ --------.-___----~----------.---_____I
L--.-d--
-- -~-
--
Reference number
IS0 9853:1991(E)
IS0 9853:1991(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 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, 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 electrotechnical 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 9853 was prepared by Technical Committee
ISO/TC 138, Plastics pipes, fittings and valves for the transport of f7uids.
Annexes A and B of this International Standard are for information only.
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 Genkve 20 l Switzerland
Printed in Switzerland
ii
IS0 9853:1991(E)
Introduction
Injection-moulded unplasticized poly(vinyl chloride) fittings can be
crushed without their failing if they contain no residual stresses as a
result of the moulding process. However, if these residual stresses are
too great, the fitting will fail when a crushing force is applied.
The percentage deformation of a fitting, in relation to its initial diameter,
constitutes a simple criterion for the selection of fittings having an ac-
ceptable level of internal stresses.
. . .
III
This page intentionally left blank

-~-~. -
INTERNATIONAL STANDARD IS0 9853:1991(E)
Injection-moulded unplasticized poly(vinyl chloride) (PVC-U)
fittings for pressure pipe systems - Crushing test
NOTE 1 For a given percentage deformation X, the dis-
1 Scope
tance h, is calculated as follows:
Ml - Jo
This International Standard specifies a crushing test
j+--
. . .
(2)
the percentage deformation of 100
to determine
injection-moulded unplasticized poly(vinyl chloride)
(PVC-U) fittings and recommends a basic specifi-
cation (see annex A).
3 Principle
It applies to injection-moulded PVC-U fittings
The fitting to be tested is inserted between the two
plates of an appropriate press. The force necessary
I_ for pressure pipelines, in accordance with
to give a percentage deformation X is applied at a
IS0 264;
constant speed of 50 mm/min. The fitting is exam-
- ined to determine whether it has fractured and, if so,
with solvent sockets, in accordance with IS0 727;
the type of fracture.
-
with sockets with elastomeric sealing rings, in
accordance with IS0 2048.
4 Apparatus
The apparatus consists essentially of the following
elements.
2 Definition
4.1 Press, operated mechanically or hydraulically,
capable of applying a sufficient force to carry out the
For the purposes of this International Standard, the
test, with a closing speed of the plates that can be
following definition applies.
controlled to 50 mm/min + 5 mm/min. See figure 1
for an example.
percentage deformation X The change in diameter
of a fitting, in relation to its initial diameter, deter-
4.2 Appropriate supports, to permit the application
mined by using the crushing test specified in this
of the force between the grooves of fittings contain-
International Standard and given by the following
ing rubber joints.
formula:
NOTE 2 Special apparatus may be required for particu-
rb - 4
,J( z - . . .
x 100 lar components such as reducing tees.
(1)
4l
where
5 Test pieces
is the distance, in millimetres, between
The test pieces shall be as-manufactured fittings, i.e.
h*
the plates of the press when they are in
fittings which have not been subjected to any trans-
contact, without the application of a
formation or solvent jointing.
force, with the test piece;
In the case of fittings containing rubber sealing
is the distance, in millimetres, between
h
rings, the
...

ISO
NORME
INTERNATIONALE 9853
Première édition
199 1-07-o 1
Raccords moulés en poly(chlorure de vinyle) non
plastifié (PVC-U) pour canalisations avec
pression - Essai à l’écrasement
Injection-moulded unplasticized poly(vinyl chloride} (WC-U} fittings for
pressure pipe systems - Crushing test
Numéro de référence
ISO 9853: 1991 (F)
Avant-propos
L’ISO (Organisation internationale de normalisation) est une fédération
mondiale d’organismes nationaux de normalisation (comités membres
de I’ISO). L’élaboration des Normes internationales est en général
confiée aux comités techniques de I’ISO. Chaque comité membre inté-
ressé par une étude a le droit de faire partie du comité technique créé
à cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec I’ISO participent également aux tra-
vaux. L’ISO collabore étroitement avec la Commission électrotechnique
internationale (CEI) en ce qui concerne la normalisation électrotech-
nique.
Les projets de Normes internationales adoptés par les comités techni-
ques sont soumis aux comités membres pour vote. Leur publication
comme Normes internationales requiert l’approbation de 75 % au moins
des comités membres votants.
La Norme internationale ISO 9853 a été élaborée par le comité techni-
que ISO/TC 138, Tubes, raccords et robinetterie en matières plastiques
pour le transport des fhides.
Les annexes A et B de la présente Norme internationale sont données
uniquement à titre d’information.
0 ISO 1991
Droits de reproduction réservés. Aucune partie de cette publication ne peut être repro-
duite ni utilisée SOUS quelque forme que ce soit et par aucun procédé, électronique ou
mécanique, y compris la photocopie et les microfilms, sans l’accord écrit de l’éditeur.
Organisation internationale de normalisation
Case Postale 56 l CH-121 1 Genéve 20 l Suisse
Imprimé en Suisse
ii
Introduction
Les raccords moulés par injection en poly(chlorure de vinyle) non plas-
tifié peuvent être écrasés sans se rompre, s’ils ne renferment pas de
contraintes résiduelles dues au moulage. Toutefois, si ces contraintes
résiduelles sont trop importantes, le raccord casse dès qu’une force
d’écrasement est appliquée.
Le pourcentage de déformation du raccord, par rapport à son diamètre
initial, constitue donc un critère simple pour sélectionner les raccords
dont le niveau des contraintes internes est acceptable.
. . .
III
Page blanche
NORME INTERNATIONALE ISO 9853:1991(F)
Raccords moulés en poly(chlorure de vinyle) non plastifié
(PVC-U) pour canalisations avec pression - Essai à
l’écrasement
h est la distance, en millimètres, entre les
1 Domaine d’application
plateaux de la presse lorsque le pour-
centage de déformation X est atteint.
La présente Norme internationale prescrit un essai
à l’écrasement pour déterminer le pourcentage de
Pour un pourcentage donné de déformation X,
NOTE 1
déformation des raccords moulés par injection en
la distance h, est. calculée comme suit:
poly(chlorure de vinyle) non plastifié (WC-U) et re-
commande en annexe A la spécification de base. Ml - x)
12, = . . .
(2)
Elle est applicable aux raccords moulés par injec-
tion en PVC-U
- pour les canalisations avec pression, conformé-
3 Principe
ment à I’ISO 264;
-
avec emboitures à coller, conformément à Insertion du raccord soumis à l’essai entre les deux
I’ISO 727; plateaux d’une presse appropriée. Application, à
une vitesse constante de 50 mm/min, de la force
--
avec emboîtures à joints de caoutchouc, confor- nécessaire pour obtenir un pourcentage de défor-
mément à ISO 2048. mation X. Détermination de la cassure éventuelle
du raccord. Examen, si nécessaire, de la nature de
la rupture.
4 Appareillage
2 Définition
L’appareillage comprend essentiellement les élé-
Pour les besoins de la présente Norme internatio-
ments suivants.
nale, la définition suivante s’applique.
pourcentage de déformation X Variation du diamè-
4.1 Presse, à fermeture mécanique ou hydraulique,
tre d’un raccord, par rapport à son diamètre initial,
capable d’appliquer une force suffisante pour la ré-
déterminée par l’essai à l’écrasement prescrit dans
alisation de l’essai, et d’une vitesse de rappro-
la présente Norme internationale et donnée par
chement des plateaux pouvant être réglée à
l’équation suivante:
50 mm/min + 5 mm/min. Voir un exemple à la
* h,-hl
figurel. -
-
---x 100
. . .
(1)
h,
où
4.2 Supports appropriés, destinés à permettre
l’application de la force entre les gorges des rac-
est la distance, en millimètres, entre les
h,
cords à joints de caoutchouc.
plateaux de la presse lorsqu’ils sont en
contact, sans l’application d’une force,
NOTE 2 Un appareillage spécial peut être nécessaire
avec l’éprouvette; dans le cas de pièces particulières, comme les tés réduits.
5 Éprouvettes 7 Mode opératoire
Les éprouvettes doivent être constituées par des
raccord
...