EN ISO 4823:2025

SLOVENSKI STANDARD
01-september-2025
Nadomešča:
SIST EN ISO 4823:2021
Zobozdravstvo - Elastomerni materiali za odtise in ugriz (ISO 4823:2025)
Dentistry - Elastomeric impression and bite registration materials (ISO 4823:2025)
Zahnheilkunde - Elastomere Abform- und Bissregistriermaterialien (ISO 4823:2025)
Médecine bucco-dentaire - Produits pour empreintes et matériaux pour enregistrement
des rapports intermaxillaires à base délastomères (ISO 4823:2025)
Ta slovenski standard je istoveten z: EN ISO 4823:2025
ICS:
11.060.10 Zobotehnični materiali Dental materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 4823
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2025
EUROPÄISCHE NORM
ICS 11.060.10 Supersedes EN ISO 4823:2021
English Version
Dentistry - Elastomeric impression and bite registration
materials (ISO 4823:2025)
Médecine bucco-dentaire - Produits pour empreintes et Zahnheilkunde - Elastomere Abform- und
matériaux pour enregistrement des rapports Bissregistriermaterialien (ISO 4823:2025)
intermaxillaires à base d'élastomères (ISO 4823:2025)
This European Standard was approved by CEN on 21 June 2025.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4823:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 4823:2025) has been prepared by Technical Committee ISO/TC 106 "Dentistry"
in collaboration with Technical Committee CEN/TC 55 “Dentistry” the secretariat of which is held by
DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by December 2025, and conflicting national standards
shall be withdrawn at the latest by December 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 4823:2021.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 4823:2025 has been approved by CEN as EN ISO 4823:2025 without any modification.

International
Standard
ISO 4823
Sixth edition
Dentistry — Elastomeric impression
2025-06
and bite registration materials
Médecine bucco-dentaire — Produits pour empreintes et
matériaux pour enregistrement des rapports intermaxillaires à
base d’élastomères
Reference number
ISO 4823:2025(en) © ISO 2025
ISO 4823:2025(en)
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 4823:2025(en)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification . 2
5 Requirements . 2
5.1 Component colours (not applicable for transparent materials) .2
5.2 Mixing time (hand-spatulated or hand-kneaded mixes) .3
5.3 Consistency .3
5.4 Working time .3
5.5 Detail reproduction .3
5.6 Linear dimensional change .3
5.7 Compatibility with gypsum .3
5.8 Elastic recovery .3
5.9 Strain in compression .3
5.10 Minimum time in the oral cavity for bite registration materials .3
5.11 Compression set of bite registration materials .3
5.12 Hardness of bite registration materials .3
6 Pre-test planning approaches . . 4
6.1 General .4
6.2 Sampling .4
6.3 Pre-test product examinations .4
6.3.1 General .4
6.3.2 Examinations for conformity with labelling requirements .4
6.3.3 Examinations for effectiveness of the packaging . .5
6.3.4 Examinations for compliance with requirements for instructions for use .5
6.4 Essential pre-test preparatory practices .5
6.4.1 Laboratory conditions .5
6.4.2 Apparatus function verification steps .5
6.4.3 Volume of materials to be mixed for each specimen .5
6.4.4 Proportioning, mixing and handling of hand-mixed materials to be tested .6
6.4.5 Timing for the specimen preparation and test procedures .6
6.4.6 Simulated oral time/temperature treatment of specimens formed in completely
closed mould assemblies .6
6.5 Pass/fail determinations .6
6.6 Expression of test results.6
7 Test methods . 6
7.1 Mixing time .6
7.1.1 Apparatus .6
7.1.2 Specimen preparation and test procedure (five specimens) .6
7.1.3 Pass/fail determination and expression of results .6
7.2 Consistency .7
7.2.1 Apparatus and materials .7
7.2.2 Advance preparation steps .7
7.2.3 Specimen preparation and test procedure (five specimens) .7
7.2.4 Pass/fail determination and expression of results .8
7.3 Working time .8
7.3.1 Apparatus .8
7.3.2 Working time test .9
7.4 Detail reproduction .10
7.4.1 Apparatus and materials .10
7.4.2 Specimen preparation .10
7.4.3 Test procedure.11

iii
ISO 4823:2025(en)
7.4.4 Pass/fail determination and expression of results .11
7.5 Linear dimensional change .11
7.5.1 Apparatus and materials .11
7.5.2 Test block line-length measurement procedure .11
7.5.3 Specimen preparation . 12
7.5.4 Test specimen measurement . 12
7.6 Compatibility with gypsum . 13
7.6.1 Apparatus and materials . 13
7.6.2 Specimen preparation .14
7.6.3 Test procedure.14
7.6.4 Pass/fail determination and expression of results .14
7.7 Elastic recovery .14
7.7.1 Apparatus and materials .14
7.7.2 Specimen preparation . 15
7.7.3 Test procedure. 15
7.7.4 Calculation of results .16
7.7.5 Pass/fail determination and expression of results .16
7.8 Strain in compression .16
7.8.1 Apparatus .16
7.8.2 Specimen preparation .16
7.8.3 Test procedure.16
7.8.4 Calculation of results .17
7.8.5 Pass/fail determination and expression of results .17
7.9 Minimum time in the oral cavity and compression set for bite registration materials .17
7.9.1 Apparatus .17
7.9.2 Specimen preparation .17
7.9.3 Test procedure.17
7.9.4 Evaluation . .17
7.9.5 Pass/fail determination and expression of results .18
7.10 Hardness of bite registration materials .18
7.10.1 Apparatus .18
7.10.2 Specimen preparation .18
7.10.3 Test procedure.18
7.10.4 Evaluation .18
7.10.5 Pass/fail determination and expression of results .18
8 Requirements for labelling and instructions supplied by the manufacturer . 19
8.1 Labelling requirements .19
8.2 Instructions for use .19
8.2.1 General .19
8.2.2 For all materials covered by this document . 20
8.2.3 For all impression materials . 20
8.2.4 Additional instructions . 20
Annex A (normative) Figures .22
Annex B (normative) Standardized hand mixing methods.30
Bibliography .33

iv
ISO 4823:2025(en)
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.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/ISO/TC 106, Dentistry, Subcommittee SC 2,
Prosthodontic materials, in collaboration with the European Committee for Standardization (CEN) Technical
Committee CEN/TC 55, Dentistry, in accordance with the Agreement on technical cooperation between ISO
and CEN (Vienna Agreement).
This sixth edition cancels and replaces the fifth edition (ISO 4823:2021), which has been technically revised.
The main changes are as follows:
— packaging and instructions for use requirements have been updated;
— editorial corrections have been made.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

v
International Standard ISO 4823:2025(en)
Dentistry — Elastomeric impression and bite registration
materials
1 Scope
This document specifies the requirements and their test methods for elastomeric impression and bite
registration materials.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 48-4, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 4: Indentation hardness by
durometer method (Shore hardness)
ISO 1942, Dentistry — Vocabulary
ISO 6873, Dentistry — Gypsum products
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1942 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
consistency
degree of firmness with which particles of a material, prepared for use, cohere so as to allow the material to
flow, or resist flow
3.2
elastic recovery
ability of an elastomer to return to its original shape when a compression load is removed
3.3
extrusion mixing
method by which two or more material components are extruded simultaneously from their separate primary
containers through a mixing nozzle from which the material components emerge as a homogeneous mixture
3.4
hand mixing
method of mixing the components of a material by means of manual kneading or spatulation
3.5
hardness
resistance to indentation
Note 1 to entry: In this document, this term refers to shore hardness according to ISO 48-4, Type A.

ISO 4823:2025(en)
[SOURCE: ISO 1382:2020, 3.247, modified — Note 1 to entry was added.]
3.6
minimum time in the oral cavity
minimum time necessary for the material to remain in the oral cavity to prevent significant deformation
3.7
mixing time
time, measured from first contact between different components of a material being mixed, until a
homogeneous mixture of the components is achieved
Note 1 to entry: The time of first contact between extrusion-mixed material components is defined as the time when
the material components enter the mixing nozzle.
3.8
outer package
wrapping or carton used to cover one or more primary containers in preparation for retail marketing
Note 1 to entry: Legislation or specific standards can apply.
3.9
primary packaging
container designed to come into direct contact with the product
[SOURCE: ISO 21067-1:2016, 2.2.3, modified — Term “packaging” replaced with “container” in the definition.]
3.10
strain in compression
flexibility/stiffness property ranges of the materials that determines whether the set materials, when
formed as impressions, can be removed from the mouth without injury to the impressed oral tissues and
have adequate stiffness in the more flexible portions of impressions to resist deformation when model-
forming products are poured against them
3.11
working time
period of time beginning with the commencement of mixing and ending before the material being mixed has
begun to exhibit elastic properties that prevents the material from being manipulated as required to form
an impression or a mould having the desired surface detail and dimensional characteristics
4 Classification
Materials covered by this document are classified according to the following consistencies, which are
determined immediately after mixing is complete according to the manufacturer’s instructions (see 8.2):
— Type 0: putty consistency;
— Type 1: heavy-bodied consistency;
— Type 2: medium-bodied consistency;
— Type 3: light-bodied consistency;
— Type B: bite registration materials.
5 Requirements
5.1 Component colours (not applicable for transparent materials)
Different components intended for use in the same mixture shall be supplied in contrasting colours to
provide a means of determining when the components have been thoroughly mixed.

ISO 4823:2025(en)
5.2 Mixing time (hand-spatulated or hand-kneaded mixes)
When the material components are combined according to the manufacturer’s instructions and the results
of the mixing are evaluated according to 7.1, the average time required to achieve a homogeneous mixture
(essentially streak-free) shall not exceed the time stated by the manufacturer.
5.3 Consistency
When tested according to 7.2, the test disc diameter shall be in the range given in Table 1 for the consistency
assigned to the material by the manufacturer.
5.4 Working time
When tested according to 7.3, the working time shall not be less than that stated in the manufacturer’s
instructions.
5.5 Detail reproduction
When tested according to 7.4, the line width reproduced shall not exceed the appropriate value given in
Table 1.
5.6 Linear dimensional change
When tested according to 7.5, the linear dimensional change shall not exceed the appropriate value given in
Table 1.
5.7 Compatibility with gypsum
The impression material shall leave a smooth surface on the gypsum model material. It shall also separate
cleanly from the gypsum model material poured against it. When tested according to 7.6, the line width
reproduced shall not exceed the appropriate value given in Table 1.
5.8 Elastic recovery
When tested according to 7.7, the elastic recovery shall be greater than or equal to the value given in Table 1.
5.9 Strain in compression
When tested according to 7.8, the strain in compression shall be in the appropriate range given in Table 1.
5.10 Minimum time in the oral cavity for bite registration materials
When tested according to 7.9, the minimum time in the oral cavity shall be smaller than or equal to the value
given by the manufacturer in the instructions for use.
5.11 Compression set of bite registration materials
When tested according to 7.9, the compression set after load removal shall be less or equal to the value given
in Table 1.
5.12 Hardness of bite registration materials
When tested according to 7.10, the hardness of the material shall be greater than or equal to the value given
in Table 1.
ISO 4823:2025(en)
Table 1 — Characteristic and physical property requirements
Test subclause number and description
7.2 7.4 7.5 7.6 7.7 7.8 7.9 7.10
Detail re- Compati-
Linear di-
Consistency production bility with
mensional
Elastic Strain in Compres-
Type gypsum
Hardness
(test disc (line width
change
recovery compression sion set
diameter) reproduced) (line width
Shore A
%
% % mm
a a
reproduced)
mm
max.
µm µm
min. max.  min. min. | max. max. min.
0 − 35 75 1,5 75 96,5 0,8 | 20,0 − −
1 − 35 50 1,5 50 96,5 0,8 | 20,0 − −
2 31 41 20 1,5 50 96,5 2,0 | 20,0 − −
3 36 − 20 1,5 50 96,5 2,0 | 20,0 − −
B − − − 1,5 − − − | − 0,1 50
a
The line reproduction shall be considered satisfactory if the required line a, b, or c is continuous between the lines d and d .
1 2
See test block in Figure A.4.
6 Pre-test planning approaches
6.1 General
This clause is provided to help test operators avoid loss of time due to potential trial and error efforts
occurring if such information were not considered before test procedures are begun.
6.2 Sampling
When procuring samples of materials for testing:
a) procure samples that have been packaged for retail or franchise marketing that have not passed the
use-by date;
b) select samples that have the same lot (batch) number [see 8.1.g)] wherever possible;
c) ensure that the sample size is:
1) up to 900 ml to conduct all required tests and for the considerable practice that is often necessary
for the test operator to become proficient in specimen preparation and testing;
2) for gypsum materials for the test on the compatibility of the impression material with gypsum, at
least 1 kg.
6.3 Pre-test product examinations
6.3.1 General
The examinations outlined in 6.3 are helpful in determining whether the sample procured (6.2) is fit for
objective testing.
6.3.2 Examinations for conformity with labelling requirements
Before opening any primary packaging container, examine it to check the quality of the content, in case it
has been compromised since manufacture.

ISO 4823:2025(en)
It is recommended to record the following information about the product in a test-record format:
a) brand name, type and class of the product, if applicable, along with an added numeric or alpha numeric
symbol for the sample;
b) use-by date for the product;
c) lot number for each component.
6.3.3 Examinations for effectiveness of the packaging
Before opening any primary packaging container, examine it to check the quality of the content, in case it
has been compromised since manufacture. Things to look for include:
a) leakage or loose tube caps or canister lids;
b) container rupture or punctures;
c) shrinkage of the content that can be detected by sight, sound or touch.
WARNING — Do not use any compromised materials for preparing specimens.
6.3.4 Examinations for compliance with requirements for instructions for use
Before discarding any secondary packaging:
a) examine the labels to determine whether they include any of the information on instructions for use
specified in 8.2;
b) locate and retain any instruction sheet provided outside the primary container;
c) examine the instructions for use for conformity with requirements stated in 8.2.
6.4 Essential pre-test preparatory practices
6.4.1 Laboratory conditions
Unless otherwise specified in this document:
a) conduct all specimen preparation and testing under the ambient laboratory conditions of (23 ± 2) °C and
(50 ± 10) % relative humidity;
b) bring all equipment and materials for the tests to the ambient temperature before beginning specimen
preparation.
6.4.2 Apparatus function verification steps
Unless otherwise specified in this document:
a) examine all accessories, instruments and equipment for functional effectiveness before they are used
in a test;
b) clear all instrumentation or equipment surfaces that come in contact with the specimen material of any
contaminants;
c) perform whatever calibration steps necessary to ensure that the items conform to the specifications
stated for them in this document or in ISO 6873.
6.4.3 Volume of materials to be mixed for each specimen
Unless otherwise specified in this document, the volume mixed for each specimen shall be (15 ± 0,5) ml.

ISO 4823:2025(en)
6.4.4 Proportioning, mixing and handling of hand-mixed materials to be tested
Standardized approaches to proportioning, mixing and handling of hand mixed materials are listed in
Annex B.
6.4.5 Timing for the specimen preparation and test procedures
A timing device such as a stop watch (permissible error of 1 s over a 30 s period) shall be used for timing
each required specimen preparation and test step.
6.4.6 Simulated oral time/temperature treatment of specimens formed in completely closed mould
assemblies
NOTE This applies to detail reproduction, linear dimensional change, elastic recovery and strain in compression
test specimens.
Immediately after the specimen forming material has been completely enclosed in the specimen forming
assembly, the entire assembly shall be conditioned at (35 ± 1) °C for the time period recommended by the
manufacturer for leaving the material in the mouth.
6.5 Pass/fail determinations
The minimum number of specimens to be tested for pass/fail determinations shall be five.
If at least four of the five specimens meet the related requirement, the material passes. If only one or two
specimens meet the requirement, the material fails. If only three specimens meet the requirement, make
a series of five additional specimens. If four of the second series of specimens meet the requirement, the
material passes. Otherwise, the material fails.
6.6 Expression of test results
Record the number of specimens tested and whether the material passes or fails.
7 Test methods
7.1 Mixing time
7.1.1 Apparatus
7.1.1.1 Recommended mixing apparatus [see 8.2.4 c)].
7.1.1.2 Timing device (see 6.4.5).
7.1.2 Specimen preparation and test procedure (five specimens)
Proportion and mix the required volume of material (see 6.4.3) for each specimen. Record the time required
to obtain a homogeneous mixture for each specimen. Calculate the mean of the results for the five specimens.
NOTE Mixes made for this test are suitable for providing increments of material for the consistency test (see 7.2).
7.1.3 Pass/fail determination and expression of results
Determine whether the mean result obtained in accordance with 7.1.2 conforms to 5.2 and report the results.

ISO 4823:2025(en)
7.2 Consistency
7.2.1 Apparatus and materials
7.2.1.1 Two glass plates, a loading plate of approximately 60 mm by 60 mm and at least 3 mm thick, and a
base plate of dimensions equal to or greater than those of the loading plate.
7.2.1.2 Material delivery system, for delivering a volume of (0,5 ± 0,2) ml of the material onto the base
plate (see Figure A.1).
7.2.1.3 Polyethylene sheets, wrinkle-free, approximately 60 mm by 60 mm and 0,035 mm thick (one per
specimen).
7.2.1.4 Polyethylene sheet discs, approximately 10 mm in diameter and 0,035 mm thick (two per
specimen).
7.2.1.5 Elastomeric plug, for forming the floor of the test increment-containing cavity.
7.2.1.6 Test apparatus, for applying a force of (14,7 ± 0,1) N (see Figure A.2). The mass of the glass loading
plate shall be included as part of the test load.
NOTE The dial indicator illustrated as a part of the test instrument in Figure A.2 plays no part in the consistency test.
7.2.1.7 Linear measuring instrument, accurate to 0,5 mm, for measuring diameters of the test specimen
disc (7.2.3).
7.2.1.8 Timing device (see 6.4.5).
7.2.2 Advance preparation steps
Complete the following steps before beginning any of the test procedures:
a) adjust the test apparatus (7.2.1.6) so that the contact surface of the loading shaft foot can descend within
5 mm of the top surface of the apparatus base;
b) cover the top surface of the base plate (7.2.1.1) with a polyethylene sheet (7.2.1.3);
NOTE A thin film of silicon grease applied to the bottom of the loading plate secures the polyethylene sheet
covering in place.
c) use the depth-gauge end of the plunger (see Figure A.1) to push the elastomeric plug (7.2.1.5) into the
tapered end of the dispensing tube to the depth allowed by the stop;
d) use the depth-gauge end of the plunger to seat two of the polyethylene sheet discs (7.2.1.4) to cover the
cavity floor formed by the plug.
7.2.3 Specimen preparation and test procedure (five specimens)
Complete the following steps within 25 s after mixing:
a) slightly overfill the cavity in the dispensing tube (see Figure A.1) with the mixed material and strike off
the excess to form the test increment;
b) push the increment-extruding end of the plunger against the elastomeric plug to expel the test increment,
along with one or both of the polyethylene discs, onto the centre of the base plate. Do not attempt to
separate the discs from the test increment;

ISO 4823:2025(en)
c) centre the increment on the base of the test apparatus (7.2.1.6) directly under the elevated loading-
shaft foot;
d) place and hold the glass loading plate centred and in contact with the shaft foot;
e) allow the (14,7 ± 0,1) N load to descend slowly onto the increment.
To obtain a more uniformly circular specimen disc, keep the glass plates as parallel as possible during
loading and keep rotation of the plates to a minimum.
Allow the total load to rest on the specimen-forming assembly for 5 s. Lift the foot of the loading shaft
from contact with the loading plate and allow the assembly to remain at room temperature for at least
15 min. Separate the loading plate from the assembly so as to leave the specimen on the base plate. Use the
measuring instrument (7.2.1.7) to make two diametral measurements of the specimen, one across the major
diameter of the disc and one across the minor diameter. Report the average of the two measurements as
the diameter to be considered when determining whether the specimen meets the diameter requirement
specified in Table 1.
7.2.4 Pass/fail determination and expression of results
Determine whether the mean result obtained in acc
...