July 2010

DIN EN 12371
D
ICS 73.020; 91.100.15 Supersedes
DIN EN 12371:2002-01

Natural stone test methods –

Determination of frost resistance
English translation of DIN EN 12371:2010-07

Prüfverfahren für Naturstein –

Bestimmung des Frostwiderstandes
Englische Übersetzung von DIN EN 12371:2010-07
Méthodes d’essai pour pierres naturelles –
Détermination de la résistance au gel
Traduction anglaise de DIN EN 12371:2010-07

Document comprises 17 pages

Translation by DIN-Sprachendienst.
In case of doubt, the German-language original shall be considered authoritative.

© No part of this translation may be reproduced without prior permission of

DIN Deutsches Institut für Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,
has the exclusive right of sale for German Standards (DIN-Normen).
English price group 10
www.din.de !$i\V" Licensed to MOH
www.beuth.de 06.10 1705751
DIN EN 12371:2010-07

A comma is used as the decimal marker.

National foreword

This standard has been prepared by Technical Committee CEN/TC 246 “Natural stones” (Secretariat: UNI,
Italy).

The responsible German bodies involved in its preparation were the Normenausschuss Materialprüfung
(Materials Testing Standards Committee) and the Normenausschuss Bauwesen (Building and Civil
Engineering Standards Committee), Joint Committee NA 062-03-11 GA Naturwerkstein; Anforderungen,
Prüfverfahren und Terminologie.

Amendments
This standard differs from DIN EN 12371:2002-01 as follows:
a) For technological tests, the minimum number of specimens for the assessment of the effect of freeze/thaw
cycles on the compressive strength has been changed to 21.
b) The properties “Thermal shock” and “Load at a dowel hole” have been deleted from Table 1.
c) For identification tests, the maximum number of freeze/thaw cycles has been changed to 168 (7.3.2.1).
d) The specimens are now to be turned after 14, 56, 84 and 140 cycles (or less, if convenient) (7.1) .
e) For identification tests, the number of control measurements has been increased (7.3).
f) Criteria 4 and 5 of the visual inspection have been combined as one (7.3.2.2).

Previous editions
DIN DVM 2104: 1928-04
DIN 52104-1: 1942x-11,1976-05, 1982-11
DIN EN 12371: 2002-01
DIN 52104-1: 1982-11
DIN 52204: 1933-08

Licensed to MOHAMMAD SAYED AHMAD. ANSI order X_343773. Downloaded 11/19/2013 1:53 PM. Single user license only. Copying and networking prohibited.
 EUROPEAN STANDARD EN 12371
NORME EUROPÉENNE
EUROPÄISCHE NORM March 2010

ICS 73.020; 91.100.15 Supersedes EN 12371:2001

English Version

Natural stone test methods —

Determination of frost resistance

Méthodes d’essai pour pierres naturelles — Prüfverfahren für Naturstein —

Détermination de la résistance au gel Bestimmung des Frostwiderstandes

This European Standard was approved by CEN on 20 February 2010.

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, Croatia, 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: Avenue Marnix 17, B-1000 Brussels

© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12371:2010: E
worldwide for CEN national Members.

Licensed to MOHAMMAD SAYED AHMAD. ANSI order X_343773. Downloaded 11/19/2013 1:53 PM. Single user license only. Copying and networking prohibited.
DIN EN 12371:2010-07
EN 12371:2010 (E)

Contents

Page
Foreword ..............................................................................................................................................................3
1 Scope ......................................................................................................................................................5
2 Normative references ............................................................................................................................5
3 Principle ..................................................................................................................................................5
4 Symbols ..................................................................................................................................................5
5 Apparatus ...............................................................................................................................................6
6 Preparation of the specimens ..............................................................................................................6
6.1 Sampling .................................................................................................................................................6
6.2 Size of specimens ..................................................................................................................................7
6.2.1 Technological test (Test A) ...................................................................................................................7
6.2.2 Identification test (Test B) .....................................................................................................................7
6.2.3 Putting reference marks on the specimens ........................................................................................7
6.3 Monitoring core temperature ................................................................................................................7
6.4 Drying the specimens ...........................................................................................................................8
6.5 Immersion of the specimens ................................................................................................................8
6.6 Determination of the apparent volume ................................................................................................8
6.7 Number of cycles ...................................................................................................................................8
6.7.1 Technological test (Test A) ...................................................................................................................8
6.7.2 Identification test (Test B) .....................................................................................................................8
7 Test procedure .......................................................................................................................................8
7.1 Arrangement of the specimens in the freezing tank ..........................................................................8
7.2 Description of the freezing and thawing cycles .................................................................................9
7.3 Control measurements to determine the freeze/thaw resistance .....................................................9
7.3.1 Technological test (Test A) ...................................................................................................................9
7.3.2 Identification test (Test B) .................................................................................................................. 10
8 Expression of the results ................................................................................................................... 11
8.1 Technological test (Test A) ................................................................................................................ 11
8.2 Identification test (Test B) .................................................................................................................. 11
9 Test report ........................................................................................................................................... 12
Annex A (informative) Test cycles .................................................................................................................. 13
Bibliography ..................................................................................................................................................... 15

Licensed to MOHAMMAD SAYED AHMAD. ANSI order X_343773. Downloaded 11/19/2013 1:53 PM. Single user license only. Copying and networking prohibited.
 DIN EN 12371:2010-07
EN 12371:2010 (E)

Foreword
This document (EN 12371:2010) has been prepared by Technical Committee CEN/TC 246 “Natural stones”,
the secretariat of which is held by UNI.

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 September 2010, and conflicting national standards shall be
withdrawn at the latest by September 2010.

This document supersedes EN 12371:2001.

This European Standard is one of the series of standards for tests on natural stone.

Test methods for natural stone consist of the following European Standards:

EN 1925 Natural stone test methods – Determination of water absorption coefficient by capillarity

EN 1926 Natural stone test methods – Determination of uniaxial compressive strength

EN 1936 Natural stone test methods – Determination of real density and apparent density, and of total
and open porosity.

EN 12370 Natural stone test methods – Determination of resistance to salt crystallisation

EN 12372 Natural stone test methods – Determination of flexural strength under concentrated load

EN 12407 Natural stone test methods – Petrographic examination

EN 13161 Natural stone test methods – Determination of flexural strength under constant moment

EN 13364 Natural stone test methods – Determination of the breaking load at dowel hole

EN 13373 Natural stone test methods – Determination of geometric characteristics on units

EN 13755 Natural stone test methods – Determination of water absorption at atmospheric pressure

EN 14066 Natural stone test methods – Determination of resistance to ageing by thermal shock

EN 14146 Natural stone test methods – Determination of the dynamic modulus of elasticity (by measuring
the fundamental resonance frequency)

EN 14147 Natural stone test methods – Determination of resistance to ageing by salt mist

EN 14157 Natural stone test methods – Determination of the abrasion resistance

EN 14158 Natural stone test methods – Determination of rupture energy

EN 14205 Natural stone test methods – Determination of Knoop hardness

EN 14231 Natural stone test methods – Determination of the slip resistance by means of the pendulum
tester

EN 14579 Natural stone test methods – Determination of sound speed propagation

EN 14580 Natural stone test methods – Determination of static elastic modulus

EN 14581 Natural stone test methods – Determination of linear thermal expansion coefficient

It is intended that other ENs should call up this European Standard as the basis of evaluation of conformity.

Licensed to MOHAMMAD SAYED AHMAD. ANSI order X_343773. Downloaded 11/19/2013 1:53 PM. Single user license only. Copying and networking prohibited.
DIN EN 12371:2010-07
EN 12371:2010 (E)

NOTE It is not intended that all natural stones products should be subjected regularly to all the listed tests.
Specifications in other standards should call up only relevant test methods.

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, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and United Kingdom.

Licensed to MOHAMMAD SAYED AHMAD. ANSI order X_343773. Downloaded 11/19/2013 1:53 PM. Single user license only. Copying and networking prohibited.
 DIN EN 12371:2010-07
EN 12371:2010 (E)

1 Scope
This European Standard specifies a method to assess the effect of freeze/thaw cycles on natural stones (see
EN 12670 for terminology, and EN 12440 for denomination). The standard contains provision for both a
shorter technological test (Test A) to assess the effect of freeze/thaw cycles on the relevant performance
characteristics and an identification test (Test B).

NOTE Some marbles, as defined in EN 12440, undergo changes in physical properties as a result of the test
conditions rather than the freeze/thaw cycles. In these cases, additional tests (for example EN 14066) should be applied.

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.

EN 1926, Natural stone test methods — Determination of uniaxial compressive strength

EN 12372, Natural stone test methods — Determination of flexural strength under concentrated load

EN 13161, Natural stone test methods — Determination of flexural strength under constant moment

EN 13364, Natural stone test methods — Determination of the breaking load at dowel hole

EN 14066, Natural stone test methods — Determination of resistance to ageing by thermal shock

EN 14146, Natural stone test methods — Determination of the dynamic modulus of elasticity (by measuring
the fundamental resonance frequency

3 Principle
The frost resistance of natural stone units is determined by a test comprising cycles of freezing in air and
thawing in water.

4 Symbols
Md0 mass of the dry specimen before immersion in water and before starting the cycles, in grams

Ms0 mass of the saturated specimen after immersion in water and before starting the cycles, in grams

Mh0 apparent mass of the specimen in water before starting the cycles, in grams

Mdn mass of the dry specimen at Nc cycles, in grams

Msn mass of the saturated specimen at Nc cycles, in grams

Mhn apparent mass of the specimen in water at n cycles, in grams

Vb0 apparent volume of the specimen before freezing, in millilitres

Vbn apparent volume of the specimen at Nc cycles, in millilitres

Licensed to MOHAMMAD SAYED AHMAD. ANSI order X_343773. Downloaded 11/19/2013 1:53 PM. Single user license only. Copying and networking prohibited.
DIN EN 12371:2010-07
EN 12371:2010 (E)

∆Vb change in apparent volume of the specimen, as a percentage

E0 dynamic elastic modulus of the dry specimen before freezing, in Megapascals

En dynamic elastic modulus of the dry specimen at n cycles, in Megapascals

∆E change in dynamic elastic modulus, as a percentage

Nc number of cycles completed before failure for identification test

5 Apparatus
5.1 A freezing tank of sufficient capacity to hold the required number of specimens, possibly with an
automatic control system to programme the freezing and thawing cycles within the chamber with a tolerance
of ± 2,0 °C.

NOTE The tests can be executed manually if no suitable automated system is available.

5.2 A temperature recording system capable of measuring temperature to + 0,1 °C.

5.3 A device for measuring dynamic elastic modulus in accordance with EN 14146.

5.4 A weighing instrument with an accuracy of at least 0,01 % of the mass to be weighed.

5.5 A ventilated oven capable of maintaining a temperature of (70 ± 5) °C.

6 Preparation of the specimens

6.1 Sampling

The sampling is not the responsibility of the test laboratory except where specially requested.

For technological tests the number of specimens shall be in accordance with the appropriate standard (see
also Table 1). Two sets of specimens are required, one to be tested after being subjected to the freeze/thaw
cycles, the other to be tested without freeze/thaw cycling. Each set shall be randomly selected from the body
of stone to be tested. In addition, one extra specimen is used to monitor the temperature of the specimens.

For an identification test, seven specimens, which are considered representative of the body of stone being
tested, shall be selected. Use one of the seven specimen to monitor the core temperature.

Licensed to MOHAMMAD SAYED AHMAD. ANSI order X_343773. Downloaded 11/19/2013 1:53 PM. Single user license only. Copying and networking prohibited.
 DIN EN 12371:2010-07
EN 12371:2010 (E)

Table 1 — Summary of the application of the freeze/thaw test

Technological test (Test A) Identification

Flexural strength Compressive strength test
(Test B)

Specimen 50 × 50 × 300
50 × 50 × 300
size (see Note 1 and 3) (see Note 2)
(see Note 3)
in mm

Minimum
number of 21 21 7
specimens
NOTE 1 Specimen size according to EN 12372 or EN 13161.

NOTE 2 Specimen size according to EN 1926.

NOTE 3 For specific stones with tendency to split (shale, phyllite, …), the thickness can be reduced to the thickness of use with
a minimum of 13 mm. If the thickness is less than the minimum thickness required in EN12372 or EN 13161, the span for testing the
flexural strength should be equal to (180 ± 1) mm

6.2 Size of specimens

6.2.1 Technological test (Test A)

Where the test is carried out to determine the effect of freeze/thaw cycles on performance characteristics the
specimens shall be in accordance with the appropriate standard. The appropriate standards are EN 12372 or
EN 13161 for flexural strength, EN 13364 for breaking load at a dowel hole, EN 14066 for resistance to
thermal shock, and EN 1926 for compressive strength.

6.2.2 Identification test (Test B)

The specimens are in the form of rectangular prisms with dimensions of 50 mm × 50 mm × 300 mm (except
for Note 3 in Table 1). The long axis shall be parallel to the anisotropy planes.

6.2.3 Putting reference marks on the specimens

Initial defects and all irregularities have to be marked with indelible marks on the specimens.

To ensure that the various dynamic elastic modulus measurements performed before and after the
freeze/thaw cycles are done at the same points on the specimens, make indelible marks, in the form of points,
on the relevant faces of the specimens.

Trace an indelible line at the point of the axis of the two supports on which the specimens will be placed
during the determination of the dynamic elastic modulus (in flexural mode).

6.3 Monitoring core temperature

One specimen shall be fitted with a device (for example a thermocouple) to measure the temperature of the
specimen during freezing and thawing cycles. The device shall be placed in a hole that is drilled parallel to the
long axis of the specimen. The diameter of this hole has to be appropriate to the diameter of the device. The
centre of the hole shall be equidistant from the edges of the specimen to a minimum depth of 50 mm from the
top. If cubes are being used, the hole shall be (25 ± 5) mm deep. The device shall be placed in the hole which
is then sealed to avoid water penetration.

Licensed to MOHAMMAD SAYED AHMAD. ANSI order X_343773. Downloaded 11/19/2013 1:53 PM. Single user license only. Copying and networking prohibited.
DIN EN 12371:2010-07
EN 12371:2010 (E)

If several sets of specimen are tested at the same time in the freezing tank, it is allowed to use only one
specimen for the monitoring of the core temperature providing that its porosity is equal to or lower than the
one of the tested specimen.

6.4 Drying the specimens

The specimens are dried at a temperature of (70 ± 5) °C to constant mass. This is assumed to have been
attained when the difference between two weighings at an interval of (24 ± 2) h is not greater than 0,1 % of
the first of these two masses. The measurement of the dry specimens is the initial value Md0. If the
specimens are to be used for an identification test, the measurements of the modulus of elasticity shall be
according to EN 14146. The measurement taken at this point is regarded as the initial value, E0.

6.5 Immersion of the specimens

Place the specimens upright in a container at least 15 mm from adjacent specimens. Then add tap water at
(20 ± 10) °C up to half the height of the specimens (time t0). At time t0 + (60 ± 5) min add tap water until the
level of the water reaches three-quarters of the height of the specimens. At time t0+ (120 ± 5) min add tap
water until the specimens are completely immersed under (25 ± 5) mm of water. The specimens then need to
be left completely immersed for (48 ± 2) h.

6.6 Determination of the apparent volume

If the specimens are to be used for an identification test, make measurements of the apparent mass in water
and the mass in air (the specimen is surface dried after removal from the water) before starting the cycles
(Mh0,and Ms0 respectively) and at Nc cycles (Mhn and Msn respectively).

6.7 Number of cycles

6.7.1 Technological test (Test A)

For technological tests the number of cycles are given in the appropriate product standard.

6.7.2 Identification test (Test B)

For an identification test the client specifies the maximum number of cycles. If no value is specified, continue
the test until the specimens are classed as failed up to a maximum of 168 cycles. The criteria for failure are
given in 7.3.2.5 (see also 7.3.2.1 to 7.3.2.4). In addition, further guidance for specific uses may be found in
relevant national annexes or specifications.

7 Test procedure

7.1 Arrangement of the specimens in the freezing tank

The specimens are placed in the tank with either the long axis vertical or horizontal and in such a way that
they do not come into contact with each other or with the sides of the tank. They are positioned at least 10 mm
apart, and at least 20 mm away from the tank sides. The reference specimen containing the temperature
measuring device is placed in the middle of the specimens to be tested.

After 14, 56, 84 and 140 cycles (or less if convenient), turn the specimens through 180° around the horizontal
axis.

Licensed to MOHAMMAD SAYED AHMAD. ANSI order X_343773. Downloaded 11/19/2013 1:53 PM. Single user license only. Copying and networking prohibited.
 DIN EN 12371:2010-07
EN 12371:2010 (E)

7.2 Description of the freezing and thawing cycles

Each cycle consists of a 6 h freezing period in air, followed by a 6 h thawing period during which the
specimens are immersed in water. The cycles shall be repeated until the specimens fail or up to the given
maximum number of cycles.

During the cycle, the changes in the temperature at the centre of the monitored specimen shall remain within
the zone shown in Figure A.1. The range of permitted temperatures is the result of different rates of cooling,
freezing and thawing which are related to the apparent density, porosity and the water absorption of the stone
under test.

Each cycle is as follows in Table 2.

Table 2 — Stages of the cycles

Temperature at the centre of Time
the monitored specimen

Start of cycle T0 ≥+5 °C ≤ +20 °C T0

Stage 1 ≤ 0 °C ≥ -8 °C T0 + 2,0 h

Stage 2 ≤ -8 °C ≥ -12 °C T0 + 6,0 h

Stage 3 By T0 +6,5 h Total immersion T0 + 6,5 h

Stage 4 ≥ +5 °C ≤ +20 °C By T0 + 9,0 h

Stage 5 ≥ +5 °C ≤ +20 °C T0 + 12,0 h

If the temperature of the stone does not remain within imposed limits of the zone (see Figure A.1), the
chamber shall be adjusted so that it does and any deviations noted in the test report. If the test is being
carried out manually, then Stage 5 can be extended to T0 + 24,0 h.

For the identification test, different numbers of cycles and conditions may be used if particular requirements
are specified by the client (see Annex A). Any changes in the conditions shall be noted in the test report.

NOTE It is important that the specimens are thawed in water as this ensures that they are water impregnated at the
start of the next freezing period.

If the test is to be interrupted, other than for testing, at any time then the specimens are to be immersed in
water at (20 ± 5) ºC. If the interruption exceeds 96 h, the specimens are to be taken out of water and wrapped
to avoid evaporation.

7.3 Control measurements to determine the freeze/thaw resistance

7.3.1 Technological test (Test A)

7.3.1.1 Visual inspection

A visual inspection may be carried out in accordance with 7.3.2.2.

Licensed to MOHAMMAD SAYED AHMAD. ANSI order X_343773. Downloaded 11/19/2013 1:53 PM. Single user license only. Copying and networking prohibited.
DIN EN 12371:2010-07
EN 12371:2010 (E)

7.3.1.2 Other methods (for example change in flexural strength)

After the completion of the required number of cycles, the specimens shall be tested in accordance with the
appropriate standard.

7.3.2 Identification test (Test B)

7.3.2.1 General

Two criteria are used to assess the action of freezing and thawing cycles on the specimens:

a) Before testing and after 14, 56, 84, 140 and 168 cycles (or after reaching the maximum number of cycles
Nc):

 visual inspection;

 measurement of the dynamic elastic modulus (Young´s modulus).

b) Before testing and after having reached the maximum number of cycles (Nc):

 measurement of the apparent volume.

All results shall be recorded in an appropriate form.

7.3.2.2 Visual inspection

After the freeze-thaw cycles, the specimens are examined on all faces and sides and their behaviour is scored
using the following scale:

0 specimen intact.

1 very minor damage (minor rounding of corners and edges) which does not compromise the integrity of
the specimen.
2
2 one or several minor cracks (≤ 0,1 mm width) or detachment of small fragments (≤ 30 mm per
fragment).

3 one or several cracks, holes or detachment of fragments larger than those defined for the ‘2’ rating, or
alteration of material in veins, or the specimen shows important signs of crumble or dissolution.

4 specimen with major cracks or broken in two or more or disintegrated.

The number of cycles at which the score of the visual examination attains 3 shall be noted (see also 7.3.2.5).

7.3.2.3 Measurement of apparent volume

Repeat the same measurements at the end of cycles (Nc) to determine Mhn and Msn respectively.

Dry the specimens (see 6.4) to determine Mdn.

The initial apparent volume is expressed by:

Vbo = (Ms0 – Mh0) (1)

10

Licensed to MOHAMMAD SAYED AHMAD. ANSI order X_343773. Downloaded 11/19/2013 1:53 PM. Single user license only. Copying and networking prohibited.
 DIN EN 12371:2010-07
EN 12371:2010 (E)

At Nc cycles, the apparent volume is expressed by:

Vbn = (Msn – Mhn) (2)

NOTE For the purposes of this test, the density of water is assumed to be 1 000 kg/m3.

The percentage change in apparent volume (∆Vb) at n cycles is calculated as follows:

((M s0 − M h0 ) − (M sn − M hn )) × 100
∆Vb = (3)
(M s0 − M h0 )

7.3.2.4 Measurement of the dynamic elastic modulus

By measuring the change in the dynamic elastic modulus during the freezing-thawing cycles it is possible to
detect some deterioration, such as microcracking. The dynamic elastic modulus (Young´s modulus) shall be
determined in accordance with EN 14146.

It is necessary to dry the specimens to constant mass (see 6.4) and then perform the measurement. The
specimens are then re-immersed in water in accordance with 6.5 before the freeze/thaw cycle is resumed.

The percentage decrease in dynamic elastic modulus (Young´s modulus) is calculated as follows:

(E 0 − E n ) × 100
∆E = (4)
E0

where

E0 is the initial measurement in a dry condition (see 6.4) performed before cycling starts;

En is the measurement in a dry condition (see 6.4) after n cycles.

The number of cycles at which the decrease of dynamic elastic modulus reaches 30 % shall be noted.

7.3.2.5 Deterioration

The test continues until two or more of the specimens are classed as failed using either of the following
criteria:

 score of the visual inspection attains 3;

 decrease of dynamic elastic modulus reaches 30 %.

8 Expression of the results

8.1 Technological test (Test A)

The change in performance is determined from the individual results using methods given in the relevant
product standard.

8.2 Identification test (Test B)

The number of cycles completed (Nc), the reasons for failure and the results of all measurements prior to
failure are recorded.

11

Licensed to MOHAMMAD SAYED AHMAD. ANSI order X_343773. Downloaded 11/19/2013 1:53 PM. Single user license only. Copying and networking prohibited.
DIN EN 12371:2010-07
EN 12371:2010 (E)

9 Test report
The test report shall contain the following information:

a) unique identification number of the report;

b) number, title and date of issue of this European Standard;

c) name and address of the test laboratory and the address where the test was carried out if different from
the test laboratory;

d) name and address of the client;

e) it is the responsibility of the client to supply the following information:

 petrographic name of the stone;

 commercial name of the stone;

 country and region of extraction;

 name of the supplier;

 direction of any existing plane of anisotropy (if relevant to the test) to be clearly indicated on the
sample or on each specimen by means of two parallel lines;

 name of the person or organization which carried out the sampling;

 surface finish of the specimens (if relevant to the test);

f) date of delivery of the sample or of the specimens;

g) date when the specimens were prepared (if relevant) and the date of testing;

h) number of specimens in the sample;

i) dimensions of the specimens;

j) for the technological test:

 percentage change in performances as a result of subjecting the specimens to freeze/thaw cycles

and the number of cycles performed;

or for the indication test:

 maximum number of cycles given by the client, and the number of cycles before deterioration
occurred (Nc);

k) statement on measurement uncertainty (where appropriate);

l) all deviations from the standard and their justification;

m) remarks.

The test report shall contain the signature(s) and role(s) of the person(s) responsible for the testing and the
date of issue of the report. It shall also state that the report shall not be partially reproduced without the written
consent of the test laboratory.

12

Licensed to MOHAMMAD SAYED AHMAD. ANSI order X_343773. Downloaded 11/19/2013 1:53 PM. Single user license only. Copying and networking prohibited.
 DIN EN 12371:2010-07
EN 12371:2010 (E)

Annex A
(informative)

Test cycles

For some specific uses it may be appropriate to use different test cycles, for example freezing in water,
freezing to a lower temperature, or testing specimens embedded in non-porous siliceous granules. In these
cases, other methods may be followed provided these variations are clearly stated in the test report.

13

Licensed to MOHAMMAD SAYED AHMAD. ANSI order X_343773. Downloaded 11/19/2013 1:53 PM. Single user license only. Copying and networking prohibited.
 DIN EN 12371:2010-07
EN 12371:2010 (E)
Licensed to MOHAMMAD SAYED AHMAD. ANSI order X_343773. Downloaded 11/19/2013 1:53 PM. Single user license only. Copying and networking prohibited.

Key
1 T = 6,5 h; Temp. = +20 °C
2 T = 0,5 h; Temp. = -7 °C
3 T = 8,5 h; Temp. = -12 °C
A Stage 1
B Stage 2
C Stage 3 ___________ : imposed limit of the zone
D Stage 4 - - - - - - - - - - : indicative limit of the zone
E Stage 5

Figure A.1 — Zone of permitted temperatures at the centre of the monitored specimen during a freezing and thawing cycle

14
 DIN EN 12371:2010-07
EN 12371:2010 (E)

Bibliography

EN 12440, Natural stone — Denomination criteria

EN 12670, Natural stone — Terminology

15

Licensed to MOHAMMAD SAYED AHMAD. ANSI order X_343773. Downloaded 11/19/2013 1:53 PM. Single user license only. Copying and networking prohibited.