SIST EN ISO 9917-1:2008
(Main)Dentistry - Water-based cements - Part 1: Powder/liquid acid-base cements (ISO 9917-1:2007)
Dentistry - Water-based cements - Part 1: Powder/liquid acid-base cements (ISO 9917-1:2007)
This part of ISO 9917 specifies requirements and test methods for powder/liquid acid-base dental cements intended for permanent cementation, lining and restoration. This part of ISO 9917 is applicable to both handmixed and capsulated cements for mechanical mixing. This part of ISO 9917 specifies limits for each of the properties according to whether the cement is intended for use as a luting agent, a base or liner or as a restorative material. This part of ISO 9917 is not intended to address resin-modified water-based cements.
Zahnheilkunde - Wasserhärtende Zemente - Teil 1: Zemente, die beim Vermischen von Pulver und Flüssigkeit über eine Säure-Base-Reaktion abbinden (ISO 9917-1:2007)
Dieser Teil von ISO ISO 9917 legt Anforderungen an und Prüfverfahren für zahnärztliche wasserhärtende Zemente fest, die beim Vermischen von Pulver und Flüssigkeit über eine Säure-Base-Reaktion abbinden, und die für definitive Befestigungen, Unterfüllungen und Füllungen vorgesehen sind. Dieser Teil von ISO ISO 9917 gilt sowohl für Zemente zum Handmischen als auch für Zemente in Kapseln zum mechanischen Mischen. Dieser Teil von ISO ISO 9917 legt Grenzwerte für jede der Eigenschaften fest, je nachdem, ob der Zement für den Einsatz als Befestigungsmittel, als Unterfüllung oder als Füllungswerkstoff vorgesehen ist. Dieser Teil von ISO ISO 9917 gilt nicht für kunststoffmodifizierte wasserhärtende Zemente.
Art dentaire - Ciments à base d'eau - Partie 1: Ciments acido-basiques liquides/en poudre (ISO 9917-1:2007)
L'ISO 9917-1:2007 spécifie les exigences et les méthodes d'essai relatives aux ciments dentaires acido-basiques liquides/en poudre destinés à être utilisés pour scellement, fond de cavité ou restauration permanente. L'ISO 9917‑1:2007 est applicable à la fois aux ciments mélangés manuellement et aux ciments en capsules destinés au mélange mécanique. L'ISO 9917-1:2007 spécifie les limites pour chacune des propriétés, que le ciment soit destiné à être utilisé comme agent de scellement, base ou fond de cavité, ou comme matériau de restauration.
L'ISO 9917-1:2007 n'est pas destinée à traiter des ciments à base d'eau modifiés par la résine.
Zobozdravstvo - Cementi na osnovi vode - 1. del: Cementi, ki se vežejo na osnovi kislinsko-bazne reakcije mešanice prahu in tekočine (ISO 9917-1:2007)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 9917-1:2008
01-april-2008
1DGRPHãþD
SIST EN ISO 9917-1:2004
=RER]GUDYVWYR&HPHQWLQDRVQRYLYRGHGHO &HPHQWLNLVHYHåHMRQDRVQRYL
NLVOLQVNRED]QHUHDNFLMHPHãDQLFHSUDKXLQWHNRþLQH ,62
Dentistry - Water-based cements - Part 1: Powder/liquid acid-base cements (ISO 9917-
1:2007)
Zahnheilkunde - Wasserhärtende Zemente - Teil 1: Zemente, die beim Vermischen von
Pulver und Flüssigkeit über eine Säure-Base-Reaktion abbinden (ISO 9917-1:2007)
Art dentaire - Ciments à base d'eau - Partie 1: Ciments acido-basiques liquides/en
poudre (ISO 9917-1:2007)
Ta slovenski standard je istoveten z: EN ISO 9917-1:2007
ICS:
11.060.10
SIST EN ISO 9917-1:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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EUROPEAN STANDARD
EN ISO 9917-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2007
ICS 11.060.10 Supersedes EN ISO 9917-1:2003
English Version
Dentistry - Water-based cements - Part 1: Powder/liquid acid-
base cements (ISO 9917-1:2007)
Art dentaire - Ciments à base d'eau - Partie 1: Ciments Zahnheilkunde - Wasserhärtende Zemente - Teil 1:
acido-basiques liquides/en poudre (ISO 9917-1:2007) Zemente, die beim Vermischen von Pulver und Flüssigkeit
über eine Säure-Base-Reaktion abbinden (ISO 9917-
1:2007)
This European Standard was approved by CEN on 8 October 2007.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 9917-1:2007: E
worldwide for CEN national Members.
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EN ISO 9917-1:2007 (E)
Contents Page
Foreword.3
2
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EN ISO 9917-1:2007 (E)
Foreword
This document (EN ISO 9917-1:2007) 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 April 2008, and conflicting national standards shall be withdrawn at the
latest by April 2008.
This document supersedes EN ISO 9917-1:2003.
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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 9917-1:2007 has been approved by CEN as a EN ISO 9917-1:2007 without any modification.
3
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INTERNATIONAL ISO
STANDARD 9917-1
Second edition
2007-10-01
Dentistry — Water-based cements —
Part 1:
Powder/liquid acid-base cements
Art dentaire — Ciments à base d'eau —
Partie 1: Ciments acido-basiques liquides/en poudre
Reference number
ISO 9917-1:2007(E)
©
ISO 2007
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ISO 9917-1:2007(E)
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ii © ISO 2007 – All rights reserved
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ISO 9917-1:2007(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Classification. 2
5 Material . 2
6 Preparation of test specimens . 3
7 Sampling. 3
8 Requirements . 3
9 Packaging, marking and information to be supplied by manufacturer. 4
Annex A (normative) Determination of net setting time. 7
Annex B (informative) Chemical composition and applications of dental cements . 9
Annex C (normative) Determination of film thickness (luting cements only). 10
Annex D (normative) Determination of compressive strength. 12
Annex E (normative) Determination of acid erosion . 14
Annex F (normative) Determination of optical properties (polyalkenoate restorative cements only) . 17
Annex G (normative) Determination of acid-soluble arsenic and lead contents. 20
Annex H (normative) Determination of radio-opacity. 21
Bibliography . 23
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ISO 9917-1:2007(E)
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 9917-1 was prepared by Technical Committee ISO/TC 106, Dentistry, Subcommittee SC 1, Filling and
restorative materials.
This second edition cancels and replaces the first edition (ISO 9917-1:2003), of which it constitutes a minor
revision.
The main purpose for modification of this part of ISO 9917 was to include a new test method for acid erosion,
a new test and requirement for radio-opacity and to distinguish between the requirements for manufacturer’s
instructions for hand-mixed cements and those for capsulated cements.
Specific qualitative and quantitative requirements for freedom from biological hazard are not included in this
part of ISO 9917, but it is recommended that, in assessing possible biological or toxicological hazards,
reference should be made to ISO 7405 and ISO 10993-1.
A bibliography has been added to this document.
ISO 9917 consists of the following parts, under the general title Dentistry — Water-based cements:
⎯ Part 1: Powder/liquid acid-base cements
⎯ Part 2: Light-activated cements
iv © ISO 2007 – All rights reserved
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INTERNATIONAL STANDARD ISO 9917-1:2007(E)
Dentistry — Water-based cements —
Part 1:
Powder/liquid acid-base cements
1 Scope
This part of ISO 9917 specifies requirements and test methods for powder/liquid acid-base dental cements
intended for permanent cementation, lining and restoration. This part of ISO 9917 is applicable to both hand-
mixed and capsulated cements for mechanical mixing. This part of ISO 9917 specifies limits for each of the
properties according to whether the cement is intended for use as a luting agent, a base or liner or as a
restorative material. This part of ISO 9917 is not intended to address resin-modified water-based cements.
2 Normative references
The following referenced documents are indispensable for the application 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 2590, General method for the determination of arsenic — Silver diethyldithiocarbamate photometric
method
ISO 3665:1996, Photography — Intra-oral dental radiographic film — Specification
ISO 3696:1987, Water for analytical laboratory use — Specification and test methods
ISO 7491, Dental materials — Determination of colour stability
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
mixing time
that part of the working time required in order to obtain a satisfactory mix of the components
3.2
working time
period of time, measured from the start of mixing, during which it is possible to manipulate a dental material
without an adverse effect on its properties
3.3
net setting time
period of time, measured from the end of mixing, until the material has set according to the criteria and
conditions specified in Annex A
NOTE For the purposes of this part of ISO 9917, in view of the wide variation in mixing times of cements, the net
setting time is determined from the end of mixing.
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ISO 9917-1:2007(E)
4 Classification
4.1 Chemical type
For the purposes of this part of ISO 9917, dental cements shall be classified on the basis of their chemical
composition, as follows:
a) zinc phosphate cement, see Clause B.1;
b) zinc polycarboxylate cement, see Clause B.2;
c) glass polyalkenoate cement, see Clause B.3.
Acid-base setting, water-based cements other than those listed above may fall within the scope of this part of
ISO 9917. If the manufacturer wishes to claim conformity for such a product, the type of material for which
equivalence of properties is claimed shall be specified in accordance with 4.1 and 4.2 so that the correct
performance limits are applied.
4.2 Application
For the purposes of this part of ISO 9917, the application of water-based cements shall be classified as
follows:
a) luting;
b) bases or lining;
c) restoration.
5 Material
5.1 General
The cement shall consist of a powder and liquid which, when mixed in accordance with the manufacturer’s
instructions, shall conform to requirements in this clause and Clause 8.
5.2 Components
5.2.1 Liquid
For non-encapsulated cements, visually inspect the liquid. It shall be free from deposits or filaments on the
inside of its container. There shall be no visible signs of gelation.
5.2.2 Powder
For non-encapsulated cements, visually inspect the powder. It shall be free from extraneous material. If the
powder is coloured, the pigment shall be uniformly dispersed throughout the powder.
5.3 Unset cement
The cement shall be mixed in accordance with Clause 6, and then visually inspected. It shall be homogeneous
and of a smooth consistency.
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ISO 9917-1:2007(E)
6 Preparation of test specimens
6.1 Ambient conditions
Specimens shall be prepared at a temperature of (23 ± 1) °C and a relative humidity of (50 ± 10) %.
6.2 Method of mixing
The cement shall be prepared in accordance with the manufacturer’s instructions. Sufficient cement shall be
mixed to ensure that the preparation of each specimen is completed from one mix. A fresh mix shall be
prepared for each specimen.
NOTE For encapsulated materials, more than one capsule simultaneously mixed, may be required for certain
specimens.
7 Sampling
7.1 Hand-mixed cements
A sample drawn from one batch shall provide sufficient material to complete all the prescribed tests and any
necessary repeats.
NOTE Approximately 50 g of powder is necessary to complete the tests.
7.2 Encapsulated cements
The test sample shall comprise a retail package of a sufficient number of capsules from one batch to complete
all the tests and any necessary repeats.
8 Requirements
8.1 Net setting time
When determined in accordance with Annex A, the net setting time of the cement shall conform to relevant
requirements specified in Table 1.
8.2 Film thickness (luting cements only)
When determined in accordance with Annex C, the film thickness shall conform to relevant requirements
specified in Table 1.
8.3 Compressive strength
When determined in accordance with Annex D, the compressive strength of the cement shall conform to the
relevant requirements specified in Table 1.
8.4 Acid erosion
When determined in accordance with Annex E, the acid erosion of the cement shall conform to the relevant
requirements specified in Table 1.
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ISO 9917-1:2007(E)
8.5 Optical properties (polyalkenoate restorative cements only)
When prepared, stored and tested in accordance with Annex F, cements shall meet the following
requirements.
a) The opacity of the set restorative cements shall be within the limits specified in Table 1, unless the
restorative cement is designated as opaque by the manufacturer [see 9.2 f)].
b) The colour of the set cement shall match the manufacturer’s shade guide. If a shade guide is not supplied
by the manufacturer, then the manufacturer shall nominate a commercially available shade guide that
shall be used in assessing compliance with this requirement [see 9.3.1 c)].
8.6 Acid-soluble arsenic and lead contents
8.6.1 Acid-soluble arsenic content
When determined in accordance with Annex G, the acid-soluble arsenic content shall not exceed the relevant
limits specified in Table 1.
8.6.2 Acid-soluble lead content
When determined in accordance with Annex G, the acid-soluble lead content shall not exceed the relevant
limits specified in Table 1.
8.7 Radio-opacity (if claimed)
When the manufacturer describes the material as being radio-opaque [see 9.2 g)], the radio-opacity shall be
at least equivalent to that for the same thickness of aluminium when determined in accordance with Annex H.
When the manufacturer claims a greater radio-opacity, the measured value shall not be less than the value
claimed when determined in accordance with Annex H.
9 Packaging, marking and information to be supplied by manufacturer
NOTE Additional information can be included at the discretion of the manufacturer or as required by other applicable
rules or regulations.
9.1 Packaging
The materials shall be supplied in containers or capsules (for the purposes of this part of ISO 9917, the
container or capsule shall be considered to be the immediate wrapping of the material) that afford adequate
protection and have no adverse effect on the quality of the contents.
An outer pack may also be used to present the containers or capsules as a single unit.
9.2 Marking
Each outer container shall be clearly marked with the following details:
a) the name and/or trademark of the manufacturer and the trade name, type and application of the cement;
b) the shade of the powder according to the manufacturer’s nominated shade guide;
c) the minimum net mass, in grams, of the powder or the minimum net volume, in millilitres of the liquid as
appropriate;
d) the manufacturer’s batch or lot number;
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ISO 9917-1:2007(E)
e) on the outermost packaging, the recommended conditions of storage, and the “expiry date” for the
material under those conditions of storage;
f) on the outer packaging, whether the cement is designated opaque;
g) on the outer packaging, whether the cement is designated as radio-opaque;
h) on each outer container of encapsulated cements, the number of capsules in the container, and the net
mass in each capsule.
9.3 Manufacturer’s instructions
9.3.1 General
Instructions shall accompany each package of the material and shall include the following:
a) the trade name of the product;
b) the manufacturer’s name and contact details;
c) a shade guide or, when no shade guide is provided, details of a commercially available shade guide for
use with the material.
In addition, at least the information in 9.3.2 or 9.3.3, as appropriate, shall be given. For those materials not
mentioned specifically in 4.1, the manufacturer shall indicate the type of material (see 4.1 and 4.2) against
whose performance requirements the material shall be tested.
9.3.2 Hand-mixed cements
For hand-mixed cements, the following information shall be supplied:
a) the temperature range for preparation;
b) the recommended powder:liquid ratio, expressed as a mass:mass ratio for the recommended
temperature range, and an indication of how the user may achieve this ratio [for test purposes, the
powder:liquid ratio on a mass:mass basis to a precision of 0,01 g at a temperature of (23 ± 1) °C and a
relative humidity of (50 ± 10) % shall be included];
c) the type of the mixing slab and spatula and their condition;
d) the rate of incorporation of the powder into the liquid;
e) the mixing time (see 3.1);
f) the working time (see 3.2);
g) the net setting time (see 3.3);
h) if appropriate, a statement recommending that a liner should be placed between the cement and the
dentine;
i) if appropriate, the minimum time at which finishing may be commenced and the recommended method of
finishing;
j) if appropriate, a statement indicating that the surface of the cement must be coated with a protective
coating and guidance on the type of coating to be used.
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ISO 9917-1:2007(E)
9.3.3 Encapsulated cements
For encapsulated cements the following instructions shall be supplied:
a) the method of bringing about physical contact between the powder and liquid;
b) the type of mechanical mixing device and the mixing time to be employed;
c) the net setting time (see 3.3);
d) the working time (see 3.2);
e) if appropriate, a statement recommending that a liner should be placed between the cement and the
dentine;
f) if appropriate, the minimum time at which finishing may be commenced and the recommended method of
finishing;
g) the minimum deliverable volume, in millilitres, of mixed cement in one capsule;
h) if appropriate, a statement indicating that the surface of the cement must be coated with a protective
coating and guidance on the type of coating to be used.
Table 1 — Requirements for dental cements
Acid- Acid-
Film
Net setting Compressive Acid soluble soluble
thick-
Opacity
time strength erosion As Pb
ness
C
0,70 content content
Chemical type Application
µm min MPa mm mg/kg mg/kg
max. min. max. min. max. min. max. max. max.
Zinc phosphate Luting 25 2,5 8 50 0,30 2 100
Zinc polycarboxylate Luting 25 2,5 8 50 0,40 2 100
Glass polyalkenoate Luting 25 1,5 8 50 0,17 100
Zinc phosphate Base/lining 2 6 50 0,30 2 100
Zinc polycarboxylate Base/lining 2 6 50 0,40 2 100
Glass polyalkenoate Base/lining 1,5 6 50 0,17 100
Glass polyalkenoate Restoration 1,5 6 100 0,17 0,35 0,90 100
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ISO 9917-1:2007(E)
Annex A
(normative)
Determination of net setting time
A.1 Apparatus
A.1.1 Cabinet, capable of being maintained at a temperature of (37 ± 1) °C and a relative humidity of at
least 90 %.
A.1.2 Indentor, of mass (400 ± 5) g, with a needle having a flat end of diameter (1,0 ± 0,1) mm which is
plane and perpendicular to the long axis of the needle.
A.1.3 Metal mould, similar to that shown in Figure A.1.
A.1.4 Metal block, of minimum dimensions 8 mm × 75 mm × 100 mm positioned within the cabinet and
maintained at (37 ± 1) °C.
A.1.5 Aluminium foil.
A.1.6 Timer, accurate to 1 s.
Dimensions in millimetres
Tolerance on dimensions ± 0,15
NOTE Internal corners may be square or rounded.
Figure A.1 — Mould for preparation of specimens for determination of net setting time
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ISO 9917-1:2007(E)
A.2 Procedure
Place the mould (A.1.3), conditioned to (23 ± 1) °C, on the aluminium foil (A.1.5) and fill to a level surface with
mixed cement.
Sixty seconds after the end of mixing, place the assembly, comprising mould, foil and cement specimen, on
the block (A.1.4), in the cabinet (A.1.1). Ensure good contact between the mould and foil, and between the foil
and block.
Ninety seconds after the end of mixing, carefully lower the indentor (A.1.2) vertically on to the surface of the
cement and allow it to remain there for 5 s. Carry out a trial run to determine the approximate setting time,
repeating the indentations at 30 s intervals until the needle fails to make a complete circular indentation in the
cement, when viewed using × 2 magnification. Clean the needle, if necessary, between indentations. Repeat
the process, starting the indentation at 30 s before the approximate setting time thus determined, making
indentations at 10 s intervals.
Record the net setting time as the time elapsed between the end of mixing and the time when the needle fails
to make a complete circular indentation in the cement. Repeat the test two more times.
A.3 Treatment of results
Record the results of the three tests. Each result shall fall within the range specified in Table 1 for the material
to meet the requirements of 8.1.
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ISO 9917-1:2007(E)
Annex B
(informative)
Chemical composition and applications of dental cements
B.1 Zinc phosphate cements
Zinc phosphate cements are based on the reaction between an oxide powder (the principal constituent of
which is zinc oxide) and an aqueous solution of phosphoric acid which may contain metal ions. They can be
used to cement dental appliances to hard oral structures or to other appliances. They can also be used as
bases for restorative materials and as temporary restorative materials.
B.2 Zinc polycarboxylate cements
Zinc polycarboxylate cements are based on the reaction between zinc oxide and aqueous solutions of
polyacrylic acid or similar polycarboxylic compounds, or zinc oxide/polycarboxylic acid powders which are
mixed with water. They can be used to cement dental appliances to hard oral structures or to other appliances.
They can also be used as a base for restorative materials and as a temporary restorative material.
B.3 Glass polyalkenoate cements
Glass polyalkenoate (glass ionomer) cements are based on the reaction between an aluminosilicate glass
powder and an aqueous solution of a polyalkenoic acid, or between an aluminosilicate glass/polyalkenoic acid
powder blend and water, or an aqueous solution of tartaric acid. These cements are used for the aesthetic
restorations of teeth or as bases or liners for other restorations. They can also be used to cement dental
appliances to hard oral structures or to other appliances. This type also includes glass polyalkenoate cements
in which the glass and a metal have been fused (cermets) or mixed together and which are intended for the
restoration of teeth.
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ISO 9917-1:2007(E)
Annex C
(normative)
Determination of film thickness (luting cements only)
C.1 Apparatus
C.1.1 Two optically flat, square or circular, glass plates, having a contact surface area of
2
(200 ± 25) mm . Each plate shall be of uniform thickness of not less than 5 mm.
C.1.2 Loading device, of the type illustrated in Figure C.1, or an equivalent means, whereby a force of
(150 ± 2) N may be generated vertically to the specimen via the upper glass plate.
The anvil, which is attached to the bottom of the rod carrying the load, shall be horizontal and parallel to the
base. The device shall be such that the force is applied smoothly and in such a manner that no rotation occurs.
C.1.3 Screw micrometer or equivalent measuring instrument, having graduations of 2 µm or smaller.
Key
1 specimen
2 glass discs
Figure C.1 — Loading device for use in film thickness test
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ISO 9917-1:2007(E)
C.2 Procedure
Measure and record to an accuracy of 1 µm the combined thickness of the two optically flat glass plates
(C.1.1) stacked in contact and designate this measurement reading A. Remove the upper plate and place
(0,10 ± 0,05) ml of the mixed cement in the centre of the lower plate and place this centrally below the loading
device (C.1.2) on the lower platen. Replace the second glass plate centrally on the cement in the same
orientation as in the original measurement.
Ten seconds before the end of the manufacturer’s stated working time, carefully generate a force of
(150 ± 2) N vertically and centrally to the specimen via the top plate. Ensure that the cement has completely
filled the space between the glass plates. When at least 10 min have elapsed after the application of the force,
remove the plates from the loading device and measure the combined thickness of the two glass plates and
the cement film and designate this measurement reading B.
Record the difference in thickness of the plates with and without the cement film (reading B − reading A) as
the thickness of the film. Repeat the test four times.
C.3 Treatment of results
At least four of the five results shall be below 25 µm for the material to pass the requirement specified in 8.2
and Table
...
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