EN ISO 1923:1995

Cellular plastics and rubbers - Determination of linear dimensions (ISO 1923:1981)

Specification of the characteristics and the choice of the measuring equipment and procedure for determination of the linear dimensions of sheets, blocks or test specimens of ceelular material (flexible and rigid). Depending on the range of the dimensions to be measured different measuring instruments are recommended.

Schaumstoffe und Schaumgummis - Bestimmung der linearen Abmessungen (ISO 1923:1981)

Diese Internationale Norm legt die Eigenschaften und die Wahl der Prüfeinrichtung sowie das Verfahren zur Bestimmung der linearen Abmessungen von Platten, Blöcken oder Probekörpern aus (weichelastischen und harten) Schaumstoffen fest.

Plastiques et caoutchoucs alvéolaires - Détermination des dimensions linéraires (ISO 1923:1981)

La présente Norme internationale fixe les caractéristiques et le choix du matériel de mesurage et du mode opératoire à suivre pour la détermination des dimensions linéaires de plaques, blocs ou éprouvettes en matériaux alvéolaires (souples et rigides).

Penjeni polimerni materiali in gume - Določanje linearnih mer (ISO 1923:1981)

General Information

• Status: Published
• Publication Date: 14-May-1995
• Withdrawal Date: 29-Nov-1995
• ICS: 83.100 - Cellular materials
• Technical Committee: CEN/TC 249 - Plastics
• Drafting Committee: CEN/TC 249/SC 4 - Cellular plastics
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 15-May-1995
• Completion Date: 15-May-1995
• Ref Project: SIST EN ISO 1923:2000 - Cellular plastics and rubbers - Determination of linear dimensions (ISO 1923:1981)

Overview

EN ISO 1923:1995 - Cellular plastics and rubbers - Determination of linear dimensions (ISO 1923:1981) specifies the measuring equipment and procedures for determining linear dimensions of sheets, blocks or test specimens of cellular materials (flexible and rigid). Adopted by CEN from ISO 1923:1981, this standard defines instrument selection, measurement technique, gauging pressure and result reporting to ensure consistent, repeatable dimension data for foam products.

Keywords: EN ISO 1923, cellular plastics, cellular rubbers, linear dimensions, foam measurement, dimensional testing

Key topics and technical requirements

• Scope: Measurement of the shortest distance between two defined points, lines or parallel planes on cellular materials (sheets, blocks, specimens).
• Measuring equipment and recommended accuracies:
  • Dial gauge (reading accuracy 0.05 mm): used when 0.05 mm accuracy required; gauging pressure specified as 100 ± 10 Pa; suitable for many specimens (may require specific measuring surface).
  • Micrometer (reading 0.05 mm or better): restricted to rigid cellular materials; measuring surface minimum diameter 5 mm and at least five times the average cell diameter.
  • Sliding caliper (vernier, reading 0.1 mm): used where 0.1 mm accuracy is appropriate.
  • Metal rule or tape (graduated mm, reading 0.5 mm): for dimensions where coarse accuracy (0.5–1 mm) suffices.
• Measurement procedure:
  • At least five measurement locations, widely separated to capture variability.
  • At each location take three readings, use the median of the three; then compute the average of the five medians.
  • Avoid distortion or damage to specimens during gauging.
• Rounding/reporting rules:
  • Dial gauge / micrometer results rounded to 0.1 mm.
  • Sliding caliper results rounded to 0.2 mm.
  • Metal rule/tape results rounded to 1 mm.
• Annex example: test apparatus with base plate, screw micrometer, 10 cm² aluminium plate to impose 100 ±10 Pa (lamp-circuit indicator) and calibrated spacer blocks (tolerance 0.01 mm).

Applications and users

• Quality control and incoming inspection of foam sheets, blocks and molded parts
• R&D and product development for polyurethane, polyethylene, PVC and rubber foams
• Accredited test laboratories performing dimensional conformity tests
• Procurement and specification writers who need reproducible dimensional data for foam components
• Regulatory or certification bodies requiring standardized measurement procedures

Related standards

• ISO 1923:1981 (original international text) - adopted by CEN as EN ISO 1923:1995
• Developed jointly by ISO/TC 45 (Rubber) and ISO/TC 61 (Plastics)

Use EN ISO 1923 when consistent, comparable linear-dimension measurement of cellular plastics and rubbers is required across manufacturing, testing and compliance workflows.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2000
3HQMHQLSROLPHUQLPDWHULDOLLQJXPH'RORþDQMHOLQHDUQLKPHU,62
Cellular plastics and rubbers - Determination of linear dimensions (ISO 1923:1981)
Schaumstoffe und Schaumgummis - Bestimmung der linearen Abmessungen (ISO
1923:1981)
Plastiques et caoutchoucs alvéolaires - Détermination des dimensions linéraires (ISO
1923:1981)
Ta slovenski standard je istoveten z: EN ISO 1923:1995
ICS:
83.100 Penjeni polimeri Cellular materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

International Standard
INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONWIE~YHAPO~HAR OPrAHH3Al#lR fl0 CTAH&APTl43A~Wl.ORGANlSATlON INTERNATIONALE DE NORMALISATION
Cellular plastics and rubbers - Determination of linear
dimensions
plastiques et caoutchoucs alvbolaires - D6 termina tion des dimensions finhaires
Second edition - 1981-09-01
UDC 678-496.8 : 531.71
Ref. No. IS0 19234981 (E)
Descriptors : cellular materials, dimensional measurement.
Price based on 3 pages
Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards institutes (IS0 member bodies). The work of developing Inter-
national 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 non-governmental, 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 IS0 1923 was developed jointly by Technical Committees
ISO/TC 45, Rubber and rubberproducts, and ISO/TC 61, Plastics, and was circulated
to the member bodies in May 1976.
It has been approved by the member bodies of the following countries :
India Poland
Australia
Austria Iran Portugal
Romania
Belgium Israel
Brazil Italy Spain
Sweden
Canada Japan
Korea, Rep. of Switzerland
Czechoslovakia
Finland Mexico Turkey
Netherlands United Kingdom
France
Germany, F. R. New Zealand USA
Hungary Philippines USSR
No member body expressed disapproval of the document.
This second edition cancels and replaces the first edition (i.e. IS0 1923-19721, as well
as IS0 Recommendation R 17944967, of which it constitutes a technical revision.
0 International Organization for Standardization, 1981
Printed in Switzerland
IS0 19234981 (E)
.
INTERNATIONAL STANDARD -
Cellular plastics and rubbers - Determination of linear
dimensions
3.4 Metal rule or metal tape, graduated in millimetres and
1 Scope and field of application
permitting reading to an accuracy of 0,5 mm.
This International Standard specifies the characteristics and the
choice of the measuring equipment and procedure for deter-
mination of the linear dimensions of sheets, blocks or test
specimens of cellular material (flexible and rigid).
4 Procedure
2 Definition
4.1 Choice of measuring equipment
For the purposes of this International Standard the following
The choice of measuring equipment shall be in accordance with
definition applies :
the accuracy corresponding to the dimensions to be measured
(see the table) :
linear dimension : The shortest distance, measured with an
instrument according to clause 3, between two specific points,
a) When an instrument accuracy of 0,05 mm is required, a
between two parallel lines or between two parallel planes,
dial gauge (3.1) or micrometer (3.2) shall be used. The
defined by corners, edges or surfaces of the cellular specimen.
micrometer may be used only for specimens of rigid cellular
material with a shape not permitting the use of a dial gauge.
3 Measuring equipment
An accuracy of 0,05 mm shall not normally be required for
dimensions of more than 10 mm.
3.1 Dial gauge with a measuring surface of about 10 cm?
b) When an instrument accuracy of 0,l mm is required, a
The gauging pressure shall be 100 & 10 Pal) and the reading sliding caliper (3.3) shall be used.
accuracy shall be 0,05 mm.
This accuracy of 0,l mm shall not normally be required for
dimensions of more than 100 mm.
3.2 Micrometer, having a measuring surface with a
minimum diameter of 5 mm, but in any case not less than five
- In this case, a dia
...