Natural stone - Rough slabs - Requirements

This document specifies requirements for rough slabs of natural stone from which products for use in buildings or commemorative stones and other similar applications are made.
It does not cover artificially agglomerated stony material nor installation.

Naturstein - Rohplatten - Anforderungen

Dieses Dokument legt Anforderungen an Rohplatten aus Naturstein fest, aus denen Erzeugnisse zur Anwendung im Bauwesen oder für Denkmale oder andere ähnliche Anwendungen hergestellt werden.
Es ist weder für künstlich hergestelltes Gesteinsmaterial noch für die Verlegung anzuwenden.

Pierres naturelles - Tranches brutes - Exigences

Le présent document spécifie les exigences relatives aux tranches brutes de pierre naturelle à partir desquelles sont fabriqués des produits destinés à être utilisés dans les bâtiments, les monuments commémoratifs ou d’autres applications similaires.
Il ne couvre pas les pierres artificielles agglomérées ni la mise en oeuvre.

Naravni kamen - Surove plošče - Zahteve

General Information

Status
Published
Public Enquiry End Date
04-Jul-2021
Publication Date
14-Nov-2022
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
10-Nov-2022
Due Date
15-Jan-2023
Completion Date
15-Nov-2022

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SLOVENSKI STANDARD
SIST EN 1468:2022
01-december-2022
Nadomešča:
SIST EN 1468:2012
Naravni kamen - Surove plošče - Zahteve
Natural stone - Rough slabs - Requirements
Naturstein - Rohplatten - Anforderungen
Pierres naturelles - Tranches brutes - Exigences
Ta slovenski standard je istoveten z: EN 1468:2022
ICS:
91.100.15 Mineralni materiali in izdelki Mineral materials and
products
SIST EN 1468:2022 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 1468:2022
---------------------- Page: 2 ----------------------
SIST EN 1468:2022
EN 1468
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2022
EUROPÄISCHE NORM
ICS 73.020; 91.100.15 Supersedes EN 1468:2012
English Version
Natural stone - Rough slabs - Requirements

Pierres naturelles - Tranches brutes - Exigences Naturstein - Rohplatten - Anforderungen

This European Standard was approved by CEN on 19 September 2022.

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

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1468:2022 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 1468:2022
EN 1468:2022 (E)
Contents Page

European foreword ............................................................................................................................................ 3

1 Scope .......................................................................................................................................................... 5

2 Normative references .......................................................................................................................... 5

3 Terms and definitions ......................................................................................................................... 5

4 Requirements ......................................................................................................................................... 6

4.1 Requirements for geometric characteristics .............................................................................. 6

4.2 Requirements of natural stones for rough slabs ....................................................................... 8

5 Marking, packaging .............................................................................................................................. 9

6 Evaluation of conformity and factory production control ..................................................... 9

6.1 Evaluation for conformity .................................................................................................................. 9

6.2 Type testing ............................................................................................................................................. 9

6.3 Factory production control ............................................................................................................. 10

Annex A (informative) Sampling ................................................................................................................ 12

Bibliography ....................................................................................................................................................... 16

---------------------- Page: 4 ----------------------
SIST EN 1468:2022
EN 1468:2022 (E)
European foreword

This document (EN 1468:2022) 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 May 2023, and conflicting national standards shall be

withdrawn at the latest by May 2023.

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 1468:2012.
The main technical changes in comparison to EN 1468:2012 are:
— addition of Note 1 to definition 3.4 “commercial size of a rough slab”;

— requirements for the Factory Production Control (FPC), including specimens for testing, are

presented in greater detail in 6.3.1.

This document is one of a series of standards for requirements of natural stone products which includes

the following:
— EN 1467, Natural stone — Rough blocks — Requirements
— EN 1468, Natural stone — Rough slabs — Requirements
— EN 1469, Natural stone products — Slabs for cladding — Requirements
— EN 12057, Natural stone products — Modular tiles — Requirements
— EN 12058, Natural stone products — Slabs for floors and stairs — Requirements
— EN 12059+A1, Natural stone products — Dimensional stone work — Requirements
Other standards on natural stone are produced by:
a) CEN/TC 178

1) EN 1341, Slabs of natural stone for external paving — Requirements and test methods

2) EN 1342, Setts of natural stone for external paving — Requirements and test methods

3) EN 1343, Kerbs of natural stone for external paving — Requirements and test methods

b) CEN/TC 128

1) EN 12326-1, Slate and stone products for discontinuous roofing and cladding — Part 1: Product

specification

2) EN 12326-2, Slate and stone products for discontinuous roofing and cladding — Part 2: Methods

of test for slate and carbonate slate
---------------------- Page: 5 ----------------------
SIST EN 1468:2022
EN 1468:2022 (E)
c) CEN/TC 125

1) EN 771-6, Specification for masonry units — Part 6: Natural stone masonry units

Other standards are relevant to stone aggregates for concrete, roads, railways and armourstone.

Any feedback and questions on this document should be directed to the users’ national standards body.

A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organisations 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.
---------------------- Page: 6 ----------------------
SIST EN 1468:2022
EN 1468:2022 (E)
1 Scope

This document specifies requirements for rough slabs of natural stone from which products for use in

buildings or commemorative stones and other similar applications are made.
It does not cover artificially agglomerated stony material nor installation.
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.

NOTE Besides the European Standards for test methods mentioned in this clause there exist further standards

which can be used for scientific examinations, but which are not relevant for the application in practice according

to this document.

EN 1936, Natural stone test methods — Determination of real density and apparent density, and of total

and open porosity

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

EN 12407, Natural stone test methods — Petrographic examination
EN 12440, Natural stone — Denomination criteria
EN 12670:2019, Natural stone — Terminology

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

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

3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 12670:2019 and the following

apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
dimensions of a rough slab
length, width (height) and thickness of a rough slab

Note 1 to entry: Dimensions are given in metres to two decimal places for length and width, and in millimetres for

thickness.
3.2
gross size of a rough slab
size corresponding to the minimum circumscribed rectangle
---------------------- Page: 7 ----------------------
SIST EN 1468:2022
EN 1468:2022 (E)
3.3
net size of a rough slab
size corresponding to the greatest inscribed rectangle
3.4
commercial size of a rough slab
size obtained by reducing net length and net width by 0,03 m

Note 1 to entry: The determination of the net and commercial dimensions of nonrectangular rough slabs can be

agreed mutually.
3.5
rough slabs

flat surface semi-finished product with unfinished edges obtained by sawing or splitting from a rough

block
3.6
bush hammered finish

finish obtained by using a bush hammer (percussion tool for roughening a surface, with a square head

and with few pyramidal percussion teeth or points) or a bush hammering machine (machine consisting

of feed rolls and an overhanging beam, supporting a pneumatic bush hammer)

[SOURCE: EN 12670:2019, 3.3.12, modified — Notes 1 and 2 to entry added to the definition]

3.7
flamed finish

surface texture obtained by thermal treatment of the stone using a high temperature flame

[SOURCE: EN 12670:2019, 3.3.39]
3.8
sand blasted finish

matt finishing resulting from the impact of the sand or other abrasive grains expelled by a sand jet

[SOURCE: EN 12670:2019, 3.3.70]
3.9
machine tooled finish
a) finish resulting from the mechanical surface treatment with tools;
b) dressed finish clearly showing tool marks
[SOURCE: EN 12670:2019, 3.3.85]
4 Requirements
4.1 Requirements for geometric characteristics
4.1.1 Measurement criteria

All measurements shall be carried out in accordance with EN 13373 and indicated in metres to two

decimal places.
---------------------- Page: 8 ----------------------
SIST EN 1468:2022
EN 1468:2022 (E)
4.1.2 Requirements for thickness

The thickness shall not deviate from the nominal thickness by more than the tolerances given in Table 1.

Table 1 — Tolerances of the nominal thickness
Nominal thickness Tolerance
up to 15 ±1,5 mm
more than 15
±10 %
up to and including 30
more than 30
±3 mm
up to and including 80
more than 80 ±5 mm
Stricter tolerances may be declared by the manufacturer.

For natural stone cleft/riven faces, the tolerances on thickness shall be declared by the manufacturer.

4.1.3 Requirements for flatness

The deviation of the surface from flatness shall not exceed 0,2 % of the slab length and shall not exceed

3 mm. For split rough slabs, the tolerance on flatness shall be declared by the manufacturer.

Stricter tolerances may also be declared by the manufacturer.
4.1.4 Requirements for surface finish
4.1.4.1 General

Surface finishes shall be carried out at least to the edges of the commercial size of rough slabs.

The surface finishing of some types of stones may typically involve the use of patching, fillers or other

similar products for natural holes, faults or cracks, and this is to be considered as part of the normal

processing.

In such cases, the type of treatment, as well as the type and nature of additional materials, shall be

declared.
The surface profile obtained by splitting shall be within declared tolerances.
4.1.4.2 Requirements for surfaces obtained by sawing

Grooves caused by sawing operations shall not have a depth greater than 2 mm. If the rough slab is to be

polished, the grooves’ depth shall not be greater than 1 mm.
Deviation from flatness shall be in accordance with 4.1.3.
4.1.4.3 Requirements for surfaces after surface finishing

Surfaces shall have a regular appearance as a function of the finishing process, and shall be worked to

meet the specified finish (e.g. making reference to samples, see 4.2.2) on all exposed surfaces.

NOTE 1 Surfaces obtained by means of hammer type tools are, for example:
— bush hammered finish (see 3.6);

— trimmed surfaces: finish obtained by using a pointed chisel and mallet or a grooving machine;

---------------------- Page: 9 ----------------------
SIST EN 1468:2022
EN 1468:2022 (E)

— striated surfaces: finish obtained by using a claw chisel (percussion tool for roughening a surface, with the

cutting end covered by several teeth of various sizes) or a ruling machine.
NOTE 2 Surfaces obtained by other finishing operations are, for example:
— flamed finish (see 3.7);
— sand blasted finish (see 3.8);

— water jet streamed finish: a matt textured surface finish, accomplished by exposing the surface to a steady jet

of water under pressure;
— machine tooled finish (see 3.9);

— riven cut finish: rugged surface produced by splitting stone with a guillotine or chisel.

4.2 Requirements of natural stones for rough slabs
4.2.1 General

The following characteristics shall be declared where requested by this document, or with reference to

use conditions.

The declared values shall be representative of the current production. However, due to natural variations

of the stone materials, deviations from the declared values may occur. Expected deviations shall be

indicated by the manufacturer.

Rough slabs of natural stones may be back reinforced and reinforced by artificial resins.

The possibility that stone processing is likely to change the characteristics of the raw material (e.g. in

consequence of strong bush hammering of the surface, of flaming or heating, of back reinforcing the slabs,

or because of the use of artificial patching, fillers or other similar products for natural holes, faults, cracks

and similar) shall be considered when determining the characteristics requested by this document.

4.2.2 Denomination

The denomination (traditional name, petrological family, typical colour and place of origin) shall always

be declared in accordance with EN 12440.
...

SLOVENSKI STANDARD
oSIST prEN 1468:2021
01-julij-2021
Naravni kamen - Surove plošče - Zahteve
Natural stone - Rough slabs - Requirements
Naturstein - Rohplatten - Anforderungen
Pierres naturelles - Tranches brutes - Exigences
Ta slovenski standard je istoveten z: prEN 1468
ICS:
91.100.15 Mineralni materiali in izdelki Mineral materials and
products
oSIST prEN 1468:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 1468:2021
---------------------- Page: 2 ----------------------
oSIST prEN 1468:2021
DRAFT
EUROPEAN STANDARD
prEN 1468
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2021
ICS 73.020; 91.100.15 Will supersede EN 1468:2012
English Version
Natural stone - Rough slabs - Requirements

Pierres naturelles - Tranches brutes - Exigences Naturstein - Rohplatten - Anforderungen

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 246.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1468:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 1468:2021
prEN 1468:2021 (E)
Contents Page

European foreword ............................................................................................................................................ 3

1 Scope .......................................................................................................................................................... 4

2 Normative references .......................................................................................................................... 4

3 Terms and definitions ......................................................................................................................... 4

4 Requirements ......................................................................................................................................... 5

4.1 Requirements for geometric characteristics .............................................................................. 5

4.1.1 Measurement criteria .......................................................................................................................... 5

4.1.2 Requirements for thickness .............................................................................................................. 5

4.1.3 Requirements for flatness ................................................................................................................. 5

4.1.4 Requirements for surface finish ...................................................................................................... 6

4.2 Requirements of natural stones for rough slabs ....................................................................... 6

4.2.1 General...................................................................................................................................................... 6

4.2.2 Denomination......................................................................................................................................... 7

4.2.3 Visual appearance ................................................................................................................................ 7

4.2.4 Apparent density and open porosity ............................................................................................. 7

4.2.5 Flexural strength ................................................................................................................................... 7

4.2.6 Other requirements ............................................................................................................................. 7

5 Marking, packaging .............................................................................................................................. 7

6 Evaluation of conformity and factory production control ..................................................... 8

6.1 Evaluation for conformity .................................................................................................................. 8

6.2 Type testing ............................................................................................................................................. 8

6.3 Factory production control ............................................................................................................... 9

Bibliography ....................................................................................................................................................... 16

---------------------- Page: 4 ----------------------
oSIST prEN 1468:2021
prEN 1468:2021 (E)
European foreword

This document (prEN 1468:2021) has been prepared by Technical Committee CEN/TC 246 “Natural

stones”, the secretariat of which is held by UNI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1468:2012.

This document is one of a series of standards for requirements of natural stone products which includes

the following:
• EN 1467, Natural stone — Rough blocks — Requirements
• EN 1468, Natural stone — Rough slabs — Requirements
• EN 1469, Natural stone products — Slabs for cladding — Requirements
• EN 12057, Natural stone products — Modular tiles — Requirements
• EN 12058, Natural stone products — Slabs for floors and stairs — Requirements
• EN 12059+A1, Natural stone products — Dimensional stone work — Requirements
Other standards on natural stone are produced by:
a) CEN/TC 178

1) EN 1341, Slabs of natural stone for external paving — Requirements and test methods

2) EN 1342, Setts of natural stone for external paving — Requirements and test methods

3) EN 1343, Kerbs of natural stone for external paving — Requirements and test methods

b) CEN/TC 128

1) EN 12326-1, Slate and stone products for discontinuous roofing and cladding — Part 1: Product

specification

2) EN 12326-2, Slate and stone products for discontinuous roofing and cladding — Part 2: Methods

of test for slate and carbonate slate
c) CEN/TC 125

1) EN 771-6, Specification for masonry units — Part 6: Natural stone masonry units

Other standards are relevant to stone aggregates for concrete, roads, railways and armourstone.

The main technical changes to EN 1468:2012 are:
— the transformation of Annex A into a normative Annex;

— the addition of Annex B (determination of commercial dimensions for nonrectangular rough

slabs).
---------------------- Page: 5 ----------------------
oSIST prEN 1468:2021
prEN 1468:2021 (E)
1 Scope

This document specifies requirements for rough slabs of natural stone from which products for use in

buildings or commemorative stones and other similar applications are made.
It does not cover artificially agglomerated stony material nor installation.
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.

EN 1936, Natural stone test methods — Determination of real density and apparent density, and of total

and open porosity

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

EN 12407, Natural stone test methods — Petrographic examination
EN 12440, Natural stone — Denomination criteria
EN 12670:2019, Natural stone — Terminology

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

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

3 Terms and definitions

For the purposes of this document, the following terms and definitions given in EN 12670:2019 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
commercial size of a rough slab
size obtained by reducing net length and net width by 0,03 m
Note 1 to entry: For the determination of commercial dimensions, see Annex B.
3.2
dimensions of a rough slab
length, width (height) and thickness of a rough slab

Note 1 to entry: Dimensions are given in metres to two decimals places for length and width, and in millimetres for

thickness.
3.3
gross size of a rough slab
size corresponding to the minimum circumscribed rectangle
---------------------- Page: 6 ----------------------
oSIST prEN 1468:2021
prEN 1468:2021 (E)
3.4
net size of a rough slab
size corresponding to the greatest inscribed rectangle
3.5
rough slab

flat surface semi-finished product with unfinished edges obtained by sawing or splitting from a rough

block
4 Requirements
4.1 Requirements for geometric characteristics
4.1.1 Measurement criteria

All measurements shall be carried out in accordance with EN 13373 and indicated in metres to two

decimals places.
4.1.2 Requirements for thickness

The thickness shall not deviate from the nominal thickness by more than the tolerances given in Table 1.

Table 1 — Tolerances of the nominal thickness
Nominal thickness Tolerance
up to 15 ±1,5 mm
more than 15
±10 %
up to and including 30
more than 30
±3 mm
up to and including 80
more than 80 ±5 mm
Stricter tolerances may be declared by the manufacturer.

For natural stone cleft/riven faces, the tolerances on thickness shall be declared by the manufacturer.

4.1.3 Requirements for flatness

The deviation of the surface from flatness shall not exceed 0,2 % of the slab length and shall not exceed

3 mm. For split rough slabs, the tolerance on flatness shall be declared by the manufacturer.

Stricter tolerances may also be declared by the manufacturer.
---------------------- Page: 7 ----------------------
oSIST prEN 1468:2021
prEN 1468:2021 (E)
4.1.4 Requirements for surface finish
4.1.4.1 General

Surface finishes shall be carried out at least to the edges of the commercial size of rough slabs.

The surface finishing of some types of stones may typically involve the use of patching, fillers or other

similar products for natural holes, faults or cracks, and this is to be considered as part of the normal

processing.

In such cases, the type of treatment, as well as the type and nature of additional materials, shall be

declared.
The surface profile obtained by splitting shall be within declared tolerances.
4.1.4.2 Requirements for surfaces obtained by sawing

Grooves caused by sawing operations shall not have a depth greater than 2 mm. If the rough slab is to be

polished, the grooves’ depth shall not be greater than 1 mm.
Deviation from flatness shall be in accordance with 4.1.3.
4.1.4.3 Requirements for surfaces after surface finishing

Surfaces shall have a regular appearance as a function of the finishing process, and shall be worked to

meet the specified finish (e.g. making reference to samples, see 4.2.2) on all exposed surfaces.

NOTE 1 Surfaces obtained by means of hammer type tools are, for example:
• bush hammered finish (see EN 12670:2019, Definition 3.3.12);

• trimmed surfaces: finish obtained by using a pointed chisel and mallet or a grooving machine;

• striated surfaces: finish obtained by using a claw chisel (percussion tool for roughening a surface, with

the cutting end covered by several teeth of various sizes) or a ruling machine.
NOTE 2 Surfaces obtained by other finishing operations are, for example:
• flamed finish (see EN 12670:2019, Definition 3.3.39);
• sand blasted finish (see EN 12670:2019, Definition 3.3.70);

• water jet streamed finish: a matt textured surface finish, accomplished by exposing the surface to a

steady jet of water under pressure;
• machine tooled finish (see EN 12670:2019, Definition 3.3.85);

• riven cut finish: rugged surface produced by splitting stone with a guillotine or chisel.

4.2 Requirements of natural stones for rough slabs
4.2.1 General

The following characteristics shall be declared where requested by this document, or with reference to

use conditions.

The declared values shall be representative of the current production. However, due to natural variations

of the stone materials, deviations from the declared values may occur. Expected deviations shall be

indicated by the manufacturer.

Rough slabs of natural stones may be back reinforced and glued by artificial resins.

---------------------- Page: 8 ----------------------
oSIST prEN 1468:2021
prEN 1468:2021 (E)

The possibility that stone processing is likely to change the characteristics of the raw material (e.g. in

consequence of strong bush hammering of the surface, of flaming or heating, of back reinforcing the slabs,

or because of the use of artificial patching, fillers or other similar products for natural holes, faults, cracks

and similar) shall be considered when determining the characteristics requested by this document.

4.2.2 Denomination

The denomination (traditional name, petrological family, typical colour and place of origin) shall always

be declared in accordance with EN 12440.
NOTE The place of origin can be given by GPS coordinates.
The petrographic definition shall be determined in accordance with EN 12407.
4.2.3 Visual appearance
This characteristic shall be declared upon request.

The colour, veining, texture, etc. of the stone shall be identified visually (for example by a polished

reference sample). The reference sample shall be provided by the supplier.

Any visual variations, for example inclusions and veins, are permissible, provided that they are

characteristic of the relevant type of natural stone and provided that they do not adversely affect the

performances of the slabs.
Visible cracks and fissures shall be marked on rough slabs.
4.2.4 Apparent density and open porosity
This characteristic shall always be declared.

The apparent density and open porosity shall be determined using the test method in EN 1936 and the

results expressed accordingly.
4.2.5 Flexural strength
...

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