Slabs of natural stone for external paving - Requirements and test methods

This European Standard specifies the performance requirements and the corresponding test methods for all natural stone slabs used for external paving and road finishes. External paving use includes all pavements typical of road works, such as pedestrian and trafficked areas, outdoor squares and similar to be used in an outdoor condition that are subject to the weathering agents, such as temperature changes, rain, ice, wind, etc. This European Standard provides also for the evaluation of conformity and for marking of the natural stone slabs. This European Standard covers also characteristics that are of importance to the trade. This European standard does not cover natural stone slabs for floors and stairs in buildings. In these cases EN 12058 applies.

Platten aus Naturstein für Außenbereiche - Anforderungen und Prüfverfahren

Diese Europäische Norm legt die Leistungsanforderungen und die entsprechenden Prüfverfahren für Natursteinplatten für Außenbereiche und Straßenbefestigungen fest. Die Verwendung in Außenbereichen umfasst alle für den Straßenbau typischen Straßenbeläge, beispiels-weise Fußgängerbereiche und Verkehrsflächen, Außenflächen und ähnliche Bereiche, die unter Außen-bedingungen verwendet werden und Verwitterungsfaktoren, wie z. B. Temperaturänderungen, Regen, Eis, Wind usw. unterliegen. Diese Europäische Norm ermöglicht ebenfalls die Konformitätsbewertung und die Kennzeichnung der Platten aus Naturstein. Diese Europäische Norm behandelt außerdem charakteristische Merkmale, die für den Handel von Bedeutung sind. Diese Europäische Norm behandelt keine Platten aus Naturstein, die als Bodenplatten und Stufenbeläge in Gebäuden verwendet werden. In diesen Fällen gilt EN 12058 [1].

Dalles de pierre naturelle pour le pavage extérieur - Exigences et méthodes d'essai

La présente Norme européenne spécifie les exigences de performances et les méthodes d'essai correspondantes, relatives à toutes les dalles de pierre naturelle utilisées en revêtement de sol extérieur. L'utilisation en extérieur du pavage comprend tous les types de revêtement utilisés pour les travaux routiers, tels que les zones de circulation des piétons et des véhicules, les espaces extérieurs et assimilés devant être utilisés dans les conditions extérieures, qui sont exposés aux facteurs climatiques tels que les variations de température, la pluie, la glace, le vent, etc. Elle spécifie le marquage et l'évaluation de conformité du produit à la présente Norme européenne.
La présente Norme européenne précise également des caractéristiques importantes sur le plan commercial. Elle ne traite ni des carreaux ou des dalles pour les dallages intérieurs ni des pavages fonctionnellement reliés aux bâtiments. Dans ces cas, il convient de faire référence à l'EN 12058. Elle ne traite pas des effets
des sels de déverglaçage (voir 4.3) car il n'existe actuellement aucune méthode d'essai reconnue.

Plošče iz naravnega kamna za zunanje tlakovanje - Zahteve in preskusne metode

Ta evropski standard določa zahteve glede zmogljivosti in pripadajoče preskusne metode za vse plošče iz naravnega kamna, ki se uporabljajo za zunanje tlakovanje in zaključno tlakovanje cest. Zunanje tlakovanje vključuje vse voziščne konstrukcije, ki so značilne za zunanje tlakovanje območij, kot so območja za pešce in promet, zunanji trgi in podobna območja, in so izpostavljene vremenskim vplivom, kot so spremembe temperature, dež, led, veter idr. Ta evropski standard podaja tudi oceno skladnosti in označevanje plošč iz naravnega kamna. Ta evropski standard pokriva tudi značilnosti, ki so pomembne v panogi. Ta evropski standard ne pokriva plošč iz naravnega kamna, ki se uporabljajo za tlakovanje tal in stopnic v zgradbah. V takih primerih se uporablja standard EN 12058.

General Information

Status
Published
Public Enquiry End Date
30-May-2009
Publication Date
20-Jan-2013
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
13-Dec-2012
Due Date
17-Feb-2013
Completion Date
21-Jan-2013

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Platten aus Naturstein für Außenbereiche - Anforderungen und PrüfverfahrenDalles de pierre naturelle pour le pavage extérieur - Exigences et méthodes d'essaiSlabs of natural stone for external paving - Requirements and test methods93.080.20Materiali za gradnjo cestRoad construction materials91.100.15Mineralni materiali in izdelkiMineral materials and productsICS:Ta slovenski standard je istoveten z:EN 1341:2012SIST EN 1341:2013en,fr,de01-marec-2013SIST EN 1341:2013SLOVENSKI

STANDARDSIST EN 1341:20021DGRPHãþD
SIST EN 1341:2013
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1341
November 2012 ICS 93.080.20 Supersedes EN 1341:2001English Version
Slabs of natural stone for external paving - Requirements and test methods

Dalles de pierre naturelle pour le pavage extérieur - Exigences et méthodes d'essai

Platten aus Naturstein für Außenbereiche - Anforderungen und Prüfverfahren This European Standard was approved by CEN on 6 October 2012.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1341:2012: ESIST EN 1341:2013

EN 1341:2012 (E) 2 Contents Page Foreword ..............................................................................................................................................................41 Scope ......................................................................................................................................................52 Normative references ............................................................................................................................53 Terms and definitions ...........................................................................................................................54 Requirements and test methods for slabs of natural stone ..............................................................74.1 General ....................................................................................................................................................74.1.1 Denomination .........................................................................................................................................74.1.2 Alteration of physical properties of the natural stone .......................................................................84.2 Dimensions .............................................................................................................................................84.2.1 General ....................................................................................................................................................84.2.2 Permissible tolerances ..........................................................................................................................84.3 Freeze/thaw resistance ...................................................................................................................... 104.3.1 Freeze- thaw under normal conditions ............................................................................................. 104.3.2 Freeze-thaw in the presence of de-icing salts ................................................................................. 114.4 Breaking strength  Flexural strength ............................................................................................ 114.5 Abrasion resistance ........................................................................................................................... 114.6 Slip and skid resistance ..................................................................................................................... 114.6.1 Slip resistance ..................................................................................................................................... 114.6.2 Skid resistance .................................................................................................................................... 124.6.3 Durability of slip and skid resistance ............................................................................................... 124.7 Appearance ......................................................................................................................................... 124.7.1 General ................................................................................................................................................. 124.7.2 Reference sample, visual inspection and acceptance criteria ...................................................... 124.8 Water absorption ................................................................................................................................ 124.9 Apparent density and open porosity ................................................................................................ 134.10 Petrographic description ................................................................................................................... 134.11 Dangerous substances ...................................................................................................................... 135 Evaluation of conformity .................................................................................................................... 135.1 General ................................................................................................................................................. 135.2 Initial type testing (ITT) - Type Testing (TT) ..................................................................................... 135.3 Factory production control ................................................................................................................ 156 Marking, labelling and packaging ..................................................................................................... 17Annex A (informative)

Guidance on the appropriate thickness for different classes of use ................... 19A.1 Introduction ......................................................................................................................................... 19A.2 Simplified method for the calculation of slab thickness ................................................................ 19A.3 Guidance on expected breaking loads ............................................................................................. 20Annex B (informative)

Guidance on sampling .............................................................................................. 21B.1 General ................................................................................................................................................. 21B.2 Principles of sampling ....................................................................................................................... 21B.3 Taking bulk samples .......................................................................................................................... 21B.4 Preparing a sampling plan ................................................................................................................. 21B.5 Sampling apparatus ........................................................................................................................... 22B.6 Sampling methods .............................................................................................................................. 22B.6.1 General ................................................................................................................................................. 22B.6.2 Sampling from quarries ..................................................................................................................... 22B.6.3 Sampling from production units and consignments ...................................................................... 23B.6.4 Sampling from construction works .................................................................................................. 23B.7 Marking, packaging and dispatch of the samples ........................................................................... 23SIST EN 1341:2013

EN 1341:2012 (E) 3 B.8 Sampling report ................................................................................................................................... 23Annex C (informative)

Example of calculation of Lower Expected Value ................................................... 25C.1 Scope .................................................................................................................................................... 25C.2 Symbols and definitions ..................................................................................................................... 25C.3 Calculation of Lower Expected Value ............................................................................................... 25Annex ZA (informative)

Clauses of this European Standard addressing the provisions of the EU Construction Products Directive ....................................................................................................... 28ZA.1 Scope and relevant characteristics ................................................................................................... 28ZA.2 Procedure for the attestation of conformity of slabs of natural stone .......................................... 29ZA.2.1 System of attestation of conformity .................................................................................................. 29ZA.2.2 EC declaration of conformity ............................................................................................................. 30ZA.3 CE marking and labelling ................................................................................................................... 31Bibliography ...................................................................................................................................................... 34 SIST EN 1341:2013

EN 1341:2012 (E) 4 Foreword This document (EN 1341:2012) has been prepared by Technical Committee CEN/TC 178 “Paving units and kerbs”, the secretariat of which is held by BSI. 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 2013, and conflicting national standards shall be withdrawn at the latest by August 2014. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1341:2001. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. The following changes have been made in this new edition: a) Where possible the requirements refer to separate test methods prepared by CEN/TC 246, "Natural stones". The change was made to allow those placing the products on the market to use the same test results for a number of products.

b) The values to be declared have been clarified and where applicable the declared values are now ‘lower expected values’. c) Annex A (Annex B in the 2001 version) has been extended to include safety factors specific to different uses.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

SIST EN 1341:2013

EN 1341:2012 (E) 5 1 Scope This European Standard specifies the performance requirements and the corresponding test methods for all natural stone slabs used for external paving and road finishes. External paving use includes all pavements typical of road works, such as pedestrian and trafficked areas, outdoor squares and similar to be used in an outdoor condition that are subject to the weathering agents, such as temperature changes, rain, ice, wind, etc. This European Standard provides also for the evaluation of conformity and for marking of the natural stone slabs. This European Standard covers also characteristics that are of importance to the trade. This European standard does not cover natural stone slabs for floors and stairs in buildings. In these cases EN 12058 [1] applies. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. 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 12371, Natural stone test methods — Determination of frost resistance 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 13373:2003, Natural stone test methods — Determination of geometric characteristics on units EN 13755, Natural stone test methods — Determination of water absorption at atmospheric pressure

EN 14157, Natural stone test methods — Determination of the abrasion resistance

EN 14231, Natural stone test methods — Determination of the slip resistance by means of the pendulum tester 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 external paving slab unit of natural stone obtained by cutting or splitting used as a paving material, used for external paving and road finishes in which the working width exceeds two times the thickness SIST EN 1341:2013

EN 1341:2012 (E) 6 3.2 upper face surface of a slab intended to be seen when in use 3.3 bed face surface of a slab intended to be in contact with the bedding material when in use 3.4 side face surface of a slab perpendicular to upper face and intended to be vertical in use 3.5 work dimension dimension of a slab, specified for its manufacture, to which the actual dimension is to conform within specified permissible tolerances 3.6 actual dimension dimension of a slab as measured 3.7 irregular plan form slab of random plan dimensions

3.8 thickness distance between the upper face and the bed face of the slab 3.9 overall length longer side of the rectangle with the smallest length able to enclose the slab 3.10 overall width shorter side of the rectangle with the smallest area able to enclose the slab 3.11 textured slab face with a surface finish produced by secondary processing, from a saw or hewn surface 3.12

fine textured surface finish with a maximum difference of 1,0 mm between peaks and depressions (e.g. polished, honed or sawn with a diamond disc or blade) 3.13 coarse textured surface finish with more than 1,0 mm difference between peaks and depressions (e.g. dolly pointed, shot blasted or flame textured) 3.14 hewn slab face or edge with a rough surface finish, e.g. a riven or split face or edge 3.15

tooled coarse finish resulting from mechanical surface treatment and showing tool marks SIST EN 1341:2013

EN 1341:2012 (E) 7 3.16 arris edge produced by the meeting of two surfaces Note 1 to entry: Sharp, rounded and chamfered arrises are shown in Figure 1. 3.17 lower expected value EL value which corresponds to the 5 %-quantile of a logarithmic normal distribution for a confidence level of 75 % 3.18 higher expected value

EH value corresponds to the 95 %-quantile of a logarithmic normal distribution for a confidence level of 75 %

Key 1 rounded arris 2
chamfered arris 3

sharp arris Figure 1 — Illustration of types of arris 4 Requirements and test methods for slabs of natural stone

4.1 General 4.1.1 Denomination The denomination shall always be declared in accordance with EN 12440 (meaning traditional name, petrological family, typical colour and place of origin as precisely as possible for example geo coordinates). SIST EN 1341:2013

EN 1341:2012 (E) 8 4.1.2 Alteration of physical properties of the natural stone If during production the natural stone slabs have been subjected to a treatment that physically alters the properties of the stone (e.g. chemical treatment, patching, or filling or other similar products for natural holes, faults or cracks), then the use of such treatment shall be stated. In addition, specimens for testing shall be representative of the product and any processes that the stone is subjected to.

4.2 Dimensions 4.2.1 General The work dimensions of the slabs shall be declared unless they are being supplied in random lengths. Where supplied in random lengths, only the widths and thickness shall be declared. Dimensions shall be measured in accordance with EN 13373. 4.2.2 Permissible tolerances 4.2.2.1 Plan dimensions (excluding slabs with irregular plan form) Plan dimensions of a slab shall be measured in accordance with EN 13373:2003, 5.2 and the deviations from the declared dimensions shall conform to the tolerances given in Table 1. Table 1 — Tolerances on plan dimension

Tolerances on plan dimension of slabs a for: Class 0 Class 1 Class 2 Marking designation P0 P1 P2 Sawn edges

No requirement ± 4 mm ± 2 mm Hewn and tooled edges ± 10 mm ± 10 mm a For natural stone slabs with regular plan form only.

The two diagonals of a rectangular slab shall be measured in accordance with EN 13373:2003, 5.2, and the maximum difference between them shall not exceed the values given in Table 2. Table 2 — Tolerances on diagonals

Tolerances on diagonals of slabs a for: Class 0 Class 1 Class 2 Marking designation D0 D1 D2 Sawn edges No requirement 6 mm 3 mm Hewn and tooled edges 15 mm 10 mm a For natural stone slabs with regular plan form only.

Tolerances stricter than P2 and D2 may be declared. SIST EN 1341:2013

EN 1341:2012 (E) 9 4.2.2.2 Thickness The thickness of a slab shall be measured in accordance with EN 13373:2003, 5.2, and the deviations from the declared thickness shall conform to tolerances given in Table 3. Table 3 — Tolerances on thickness

Tolerances on thickness of slabs for: Class 0 Class 1 Class 2 Marking designation T0 T1 T2 ≤ 30 mm thick No requirement a ± 3 mm ± 10 % 30 mm < thickness ≤ 80 mm ± 4 mm ± 3 mm > 80 mm thick ± 7 mm ± 4 mm a

Manufacturers are encouraged to declare deviations measured in accordance with EN 13373:2003, 5.2.

Dimensions between faces may be declared as a range of nominal minimum-maximum thicknesses, e.g. 30 – 60 mm and a tolerance declared on the limits of the range. This is particularly applicable to hewn slabs.

Tolerances stricter than T2 may be declared. 4.2.2.3 Face irregularities The face irregularities on hewn slabs, measured in accordance with EN 13373:2003, 5.3, shall never be greater than 20 mm above the work thickness and not below the work thickness (i.e. (+20/-0) mm) and the greatest measured value shall be declared.

4.2.2.4 Flatness and straightness 4.2.2.4.1 Arrises The straightness along the arrises of textured slabs plan dimensions shall be measured in accordance with EN 13373:2003, 5.4, and the deviations from the declared straightness shall conform to tolerances given in Table 4. Table 4 — Tolerances on straightness along arrises

Tolerances on straightness along arrises of slabs Longest test straight edge 0,5 m 1 m 1,5 m Fine textured face ± 2 mm ± 3 mm ± 4 mm Coarse textured face ± 3 mm ± 4 mm ± 6 mm

4.2.2.4.2 Faces Flatness and bow shall be measured in accordance with EN 13373:2003, 5.4, and the deviations from the declared flatness and bow shall conform to tolerances given in Table 5 unless the surface is riven in which case information on the deviations shall be declared.

SIST EN 1341:2013

EN 1341:2012 (E) 10 The vertical faces of hewn or tooled slab shall be undercut relative to the top arrise by no more 12 mm for a slab 80 mm thick or less and by no more 15 mm for slab greater than 80 mm thick. The vertical faces shall not be overcut by more than the permitted dimensional tolerance.

Table 5 — Tolerance on flatness for faces Tolerance on flatness for faces for a) Fine textured face

Gauge length
mm Max. convex tolerance
mm Max. concave tolerance

mm 300 2,0 1,0 500 3,0 2,0 800 4,0 3,0 1 000 5,0 4,0 b) Coarse textured face Gauge length

mm Max. convex tolerance
mm Max. concave tolerance
mm 300 3,0 2,0 500 4,0 3,0 800 5,0 4,0 1 000 8,0 6,0

4.2.2.5 Arrises Arrises described as square or sharp may have a bevel with horizontal or vertical dimensions not exceeding 2 mm at the manufacturer’s discretion. When slabs are supplied with a chamfered or rounded arris, the dimensions shall be declared and the vertical and horizontal dimension shall be within ± 2 mm of the declared dimensions. 4.2.2.6 Angles and special shapes Each slab angle shall be in accordance with the agreed geometry. Pieces of special or irregular shape shall be checked for compliance with the required shape by use of a specified template, the permissible tolerance at any point shall be in accordance with Table 1. Deviations stricter than in Table 1 may be declared. Deviations may not be added to each other, e.g. deviations on thickness and flatness. 4.3 Freeze/thaw resistance 4.3.1 Freeze- thaw under normal conditions

When the slabs are intended to be used in areas subjected to freeze-thaw requirements, the freeze/thaw resistance shall be determined using the test method in EN 12371. The results shall be expressed and declared as the mean flexural strength after 56 cycles of freeze/thaw (technological test).

SIST EN 1341:2013

EN 1341:2012 (E) 11 The frost damage, which a natural stone may suffer when installed, depends on the climatic conditions of the place of use, the relative position in the works (which determines the degree of saturation) and the predicted service life of the works. This number of cycles is appropriate to a specific project and may help to provide guidance for the interpretation of the test results. The selection of the stones is subjected to climatic zones and/or to codes of practice. For some specific uses, for example in locations that are subject to temperatures below -12 °C, it may be appropriate to use different test cycles, e.g. freezing in water, freezing to a lower temperature, or testing specimens embedded in non-porous siliceous granules or a different number of cycles, e.g. the identification test as defined in EN 12371. 4.3.2 Freeze-thaw in the presence of de-icing salts

Where required, freeze-thaw resistance with the effect of de-icing salts shall be determined and declared. In the absence of a European test method, freeze-thaw resistance with the effect of de-icing salts shall be determined and declared according to national provisions valid in the place of use of the product. 4.4 Breaking strength  Flexural strength The flexural strength shall be determined using the test method in EN 12372 and the lower expected value (EL) shall be declared. An identification test as defined in EN 12372 is normally carried out. However, where the surface finish of the delivered product is known, the test may be carried out with this finish, in accordance with the technological tests defined in EN 12372. NOTE 1

Guidance on the appropriate thickness for different classes of use is given in Annex A. NOTE 2 An example of the calculation used to determine the lower expected value is given in Annex C. 4.5 Abrasion resistance The abrasion resistance shall be determined using the test method in EN 14157 and the higher expected value (EH) shall be declared. 4.6 Slip and skid resistance 4.6.1 Slip resistance

The slip resistance shall be declared when the intended use of the slabs is subject to regulatory requirements, or upon request, and, in any case, when the roughness of the surface, measured following EN 13373:2003, 5.3, is less than 1,0 mm. The slip resistance shall be determined and the results expressed in accordance with the test procedure for wet conditions in EN 14231. NOTE 1 Coarse textured and hewn slabs are assumed to give satisfactory slip resistance.

NOTE 2 The unpolished slip resistance value (USRV) relates to slabs as manufactured and helps to ensure adequate slip/skid resistance on installation. NOTE 3 Experience has indicated that a USRV measurement, made using a wide slider/full swing on a pendulum that is greater than 35 in wet conditions, can usually be considered acceptable for surfaces that are horizontal or sloping at less than 6 %. SIST EN 1341:2013

EN 1341:2012 (E) 12 4.6.2 Skid resistance Where required, skid resistance shall be declared.

In the absence of a European test method, skid resistance shall be determined and declared according to national provisions valid in the place of use of the product. 4.6.3 Durability of slip and skid resistance When required, durability of slip and skid resistance shall be declared.

In the absence of European test methods, durability of slip and skid resistance shall be determined and declared according to national provisions valid in the place of use of the product. 4.7 Appearance

4.7.1 General The colour, veining, texture, etc. of the natural stone shall be identified visually, typically by a reference sample of the same stone suitable for providing a general description of visual appearance.

A reference sample shall be provided by the supplier of the stone according to 4.7.2. 4.7.2 Reference sample, visual inspection and acceptance criteria A reference sample shall be an adequate number of pieces of natural stone of sufficient size to indicate the general appearance of the finished work. The dimensions of individual pieces shall be at least 0,01 m2 (typical values are between 0,01 m2 and 0,25 m2 in face area but may be greater) and shall indicate the range of appearance regarding the colouring, the vein pattern, the physical structure and the surface finish. In particular the reference sample shall show specific characteristics of the stone, such as typical holes, glass seams, spots, crystalline veins and rusty spots. The reference sample does not imply strict uniformity between the sample itself and the actual supply; natural variations may always occur. If the processing of the stone involves the use of patching, fillers or other similar products for natural holes, faults or cracks, then the reference sample shall similarly display the impact of the same on the finished surface. All the characteristics as shown by the reference sample shall be considered typical of the stone and not as flaws, therefore they shall not become a reason for rejection, unless their concentration becomes excessive and the typical character of the stone is lost. The name and address of the manufacturer or the supplier of the stone, as well as the denomination of the stone in accordance with 4.1 and/or information on the treatment in accordance with 4.1.2, above, shall be indicated on the reference sample. Any comparison between production sample and reference sample shall be carried out by placing the reference sample against the production samples and viewing them at a distance of about 2 m under normal daylight conditions and recording any visible differences in the characteristics of the stones. 4.8 Water absorption Where required the water absorption shall be determined using the test method in EN 13755 and the higher expected value (EH) shall be declared. SIST EN 1341:2013

EN 1341:2012 (E) 13 4.9 Apparent density and open porosity The apparent density and open porosity shall be determined using the test method in EN 1936 and the mean values declared. 4.10 Petrographic description A petrographic description shall be provided, including a petrographic name, of the stone type, in accordance with EN 12407. 4.11 Dangerous substances National regulations on dangerous substances may require verification and declaration on release, and sometimes content, when construction products covered by this standard are placed on those markets. In the absence of European harmonised test methods, verification and declaration on release/content should be done taking into account national provisions

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