EN 771-2:2011

SLOVENSKI STANDARD
01-julij-2011
1DGRPHãþD
SIST EN 771-2:2004
SIST EN 771-2:2004/A1:2005
6SHFLILNDFLMD]D]LGDNHGHO$SQHQRSHãþHQL]LGDNL
Specification for masonry units - Part 2: Calcium silicate masonry units
Festlegungen für Mauersteine - Teil 2: Kalksandsteine
Spécifications pour éléments de maçonnerie - Partie 2 : Eléments de maçonnerie en
silico-calcaire
Ta slovenski standard je istoveten z: EN 771-2:2011
ICS:
91.100.15 Mineralni materiali in izdelki Mineral materials and
products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 771-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2011
ICS 91.100.25 Supersedes EN 771-2:2003
English Version
Specification for masonry units - Part 2: Calcium silicate
masonry units
Spécifications pour éléments de maçonnerie - Partie 2: Festlegungen für Mauersteine - Teil 2: Kalksandsteine
Eléments de maçonnerie en silico-calcaire
This European Standard was approved by CEN on 10 March 2011.

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, 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
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 771-2:2011: E
worldwide for CEN national Members.

Contents Page
Foreword .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .6
4 Materials and manufacture .8
5 Requirements for calcium silicate masonry units .8
5.1 General .8
5.2 Dimensions and tolerances .8
5.2.1 Dimensions .8
5.2.2 Dimensional tolerances .9
5.3 Configuration . 10
5.4 Dry density . 11
5.4.1 Gross dry density . 11
5.4.2 Net dry density . 11
5.5 Compressive strength . 11
5.6 Thermal properties . 12
5.7 Durability . 12
5.8 Water vapour permeability . 12
5.9 Reaction to fire . 13
5.10 Water absorption . 13
5.11 Moisture movement . 13
5.12 Bond strength . 13
5.12.1 General . 13
5.12.2 Declaration based on fixed values . 13
5.12.3 Declaration based on tests . 13
6 Description, designation and classification of calcium silicate masonry units . 14
6.1 Description and designation . 14
6.2 Classification . 14
7 Marking . 14
8 Evaluation of conformity . 15
8.1 General . 15
8.2 Initial type tests . 15
8.3 Factory production control . 16
8.3.1 General . 16
8.3.2 Testing and measuring equipment . 16
8.3.3 Production Equipment . 16
8.3.4 Raw materials . 17
8.3.5 Production process . 17
8.3.6 Finished product testing . 17
8.3.7 Statistical techniques . 17
8.3.8 Marking and stock control of products . 17
8.3.9 Traceability . 17
8.3.10 Nonconforming products . 17
Annex A (normative) Sampling for initial type testing and for independent testing of
consignments . 18
A.1 General . 18
A.2 Sampling procedure . 18
A.2.1 General . 18
A.2.2 Random sampling . 18
A.2.3 Representative sampling . 18
A.2.4 Dividing the sample . 19
A.2.5 Number of units required for tests . 19
Annex B (normative) Cutting schemes . 20
B.1 General . 20
B.2 Representative portions for compressive strength determination . 20
B.3 Representative portions for determination of freeze-thaw resistance . 21
Annex C (normative) Tolerances on accessory units . 22
C.1 Dimensions of rectangular and non-rectangular accessory calcium silicate masonry units . 22
C.2 Tolerances for accessory calcium silicate masonry units . 24
Annex D (informative) Classification systems . 25
D.1 Classification based on compressive strength . 25
D.2 Classification based on gross dry density . 25
Annex E (informative) Guidance for test frequencies for designing a FPC system to demonstrate
conformity of finished products with the requirements of the standard and the
declaration of the manufacturer . 27
Annex ZA (informative) Clauses of this European Standard addressing the provisions of the EU
Construction Products Directive . 29
ZA.1 Scope and relevant characteristics . 29
ZA.2 Procedure(s) for attestation of conformity of calcium silicate masonry units . 30
ZA.2.1 System(s) of attestation of conformity . 30
ZA.2.2 EC Certificate and Declaration of Conformity . 32
ZA.3 CE marking and labelling. 33
Bibliography . 36

Foreword
This document (EN 771-2:2011) has been prepared by Technical Committee CEN/TC 125 “Masonry”, 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 November 2011, and conflicting national standards shall be withdrawn
at the latest by November 2011.
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 771-2:2003.
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 the EU Construction Products
Directive (89/106/EEC).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.
This European Standard also takes into account the general rules for reinforced and unreinforced masonry in
Eurocode 6.
EN 771, Specification for masonry units consists of:
− Part 1: Clay masonry units
− Part 2: Calcium silicate masonry units
− Part 3: Aggregate concrete masonry units (Dense and light-weight aggregates)
− Part 4: Autoclaved aerated concrete masonry units
− Part 5: Manufactured stone masonry units
− Part 6: Natural stone masonry units
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 the United Kingdom.

1 Scope
This European Standard specifies the characteristics and performance requirements of calcium silicate
masonry units for which the main intended uses are inner walls, outer walls, cellars, foundations and external
chimney masonry.
This European Standard is intended to apply to all calcium silicate masonry units, including those of an overall
nonrectangular parallelepiped shape, specially shaped and accessory units.
It defines the performance related to e.g. strength, density and dimensional accuracy, measured according to
the corresponding test methods contained in separate European Standards.
It provides for the evaluation of conformity of the product to this European Standard. The marking requirement
for products covered by this document is also included.
This European Standard does not specify standard sizes for calcium silicate masonry units, nor standard work
dimensions and angles of specially shaped and accessory units.
It does not cover units with more than 60 % volume of voids, nor products made from shale as a major raw
material.
It does not cover storey height panels.
It does not cover units intended for use as a damp proof course, nor units with an incorporated thermal
insulation material bonded to the faces of the unit susceptible to be exposed to fire, nor chimney flue units.
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 772-1, Methods of test for masonry units — Part 1: Determination of compressive strength
EN 772-2, Methods of test for masonry units — Part 2: Determination of percentage area of voids in
aggregate concrete masonry units (by paper indentation)
EN 772-9, Methods of test for masonry units — Part 9: Determination of volume and percentage of voids and
net volume of clay and calcium silicate masonry units by sand filling
EN 772-13, Methods of test for masonry units — Part 13: Determination of net and gross dry density of
masonry units (except for natural stone)
EN 772-16:2011, Methods of test for masonry units — Part 16: Determination of dimensions
EN 772-18:2011, Methods of test for masonry units — Part 18: Determination of freeze-thaw resistance of
calcium silicate masonry units
EN 772-20, Methods of test for masonry units — Part 20: Determination of flatness of faces of aggregate
concrete, manufactured stone and natural stone masonry units
EN 772-21, Methods of test for masonry units - Part 21: Determination of water absorption of clay and calcium
silicate masonry units by cold water absorption
EN 1052-3, Methods of test for masonry — Part 3: Determination of initial shear strength
EN 1745, Masonry and masonry products — Methods for determining thermal properties
EN 13501-1, Fire classification of construction products and building elements — Part 1: Classification using
data from reaction to fire tests
EN ISO 12572, Hygrothermal performance of building materials and products — Determination of water
vapour transmission properties (ISO 12572:2001)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
masonry unit
preformed component intended for use in masonry construction
3.2
calcium silicate masonry unit
masonry unit made predominantly from lime and siliceous materials, hardened by high pressure steam
3.3
shale
fine grained sedimentary rock, finely laminated and consisting of mainly quartz and clay minerals
3.4
co-ordinating size
size of the co-ordinating space allocated to a masonry unit including allowances for joints and tolerances
3.5
work size
size of a masonry unit specified for its manufacture, to which the actual size conforms within permissible
deviations
3.6
actual size
size of a masonry unit as measured
3.7
regular shaped masonry unit
masonry unit with an overall rectangular parallelepiped shape
3.8
specially shaped masonry unit
masonry unit which is not a rectangular parallelepiped
3.9
accessory unit
masonry unit which is shaped to provide a particular function, e.g. to complete the geometry of the masonry
NOTE It may be obtained by cutting a large unit.
3.10
interlocking feature
shaped matched projections and indentations on masonry units
EXAMPLE Tongue and groove systems.
3.11
hole
formed void which may or may not pass completely through a masonry unit
3.12
perforation
formed void which passes completely through a masonry unit
3.13
cell
formed void which does not pass through a masonry unit
3.14
frog
depression formed in one or both bed faces of a unit, the total volume of all such depressions which does not
exceed a certain limit of the overall volume of the unit, i.e. length × width × height
3.15
recess
depression or indentation in one or more surfaces of a masonry unit
EXAMPLE Mortar pocket, rendering keyway.
3.16
shell
peripheral material between the hole(s) and the outer surfaces of a masonry unit
3.17
web
solid material between the holes in a masonry unit
3.18
normalized compressive strength of masonry units
compressive strength of masonry units converted to the air dry compressive strength of an equivalent 100 mm
wide and 100 mm high masonry unit
NOTE See procedure given in EN 772-1.
3.19
mean compressive strength of masonry units
arithmetic mean of the compressive strengths of masonry units
3.20
characteristic compressive strength of masonry units
compressive strength corresponding to the 5 % fractile of the compressive strength of masonry units
3.21
declared value
value that a manufacturer is confident of achieving, bearing in mind the precision of the test and the variability
of the manufacturing process
3.22
Category I masonry units
units with a declared compressive strength with a probability of failure to reach it not exceeding 5 %
NOTE This may be determined via the mean or characteristic value.
3.23
Category II masonry units
units not intended to comply with the level of confidence of Category I units
3.24
combined thickness of webs and shells
sum of the thicknesses of the shells and webs from one face or header of a masonry unit to the opposite face
or header respectively along whichever path, via the formed voids, gives the smallest value, expressed as a
percentage of the unit width or length respectively
3.25
grip hole
hole in a masonry unit to enable it to be more readily grasped and lifted by hand or machine
3.26
product group
products from one manufacturer having common values for one or more characteristics
3.27
consignment
shipment from the supplier
4 Materials and manufacture
Calcium silicate masonry units are produced predominantly from a mixture of lime and natural siliceous
materials (sand, crushed or uncrushed siliceous gravel or rock or a mixture thereof), hardened by high
pressure steam.
Calcium silicate masonry units produced with a majority of other siliceous materials are permitted if these
materials have no deleterious effect on the properties of the product. The presence of such a material shall be
declared.
5 Requirements for calcium silicate masonry units
5.1 General
The requirements and properties specified in this European Standard shall be defined in terms of the test
methods and other procedures referred to in this European Standard.
It should be noted that the test methods are not always applicable to specially shaped and accessory units as
defined in 3.8. and 3.9.
The conformity criteria given in the following subclauses relate to initial type testing (see 8.2) and, when
relevant, to consignment testing (see Annex A). For the compressive strength of Category I units, use a
50 % fractile (p = 0,50) for mean values and a confidence level of 95 %.
For production evaluation, the manufacturer shall define the conformity criteria in the factory production
control documentation (see 8.3).
5.2 Dimensions and tolerances
5.2.1 Dimensions
The dimensions of a calcium silicate masonry unit shall be declared in mm for length, width and height, in that
order. They shall be given in terms of work size.
NOTE In addition the co-ordinating size may be given. See Figure 1.
Key
1 Length 3 Height 5 Face
2 Width 4 Bed 6 Header
NOTE This relates to the normal use of the masonry unit in the wall.
Figure 1 — Dimensions and surfaces
When a specified number of calcium silicate masonry units is sampled from a consignment in accordance with
Annex A and tested in accordance with EN 772-16, the tolerances shall be indicated as in 5.2.2.1. The
determination of length, width and height shall be by one measurement taken approximately in the centre of
each specimen (EN 772-16:2011, 7.1, procedure d)). When there is a need to exclude irregular surfaces
(tongues and grooves, grip holes, etc.) in providing the dimension, EN 772-16:2011 procedure e) shall be
used.
Dimensions and tolerances of accessory units need only be declared by the manufacturer, if the accessory
units are placed on the market as individual products and do not form part of a customised consignment.
When a specified number of accessory units is sampled from a consignment in accordance with Annex A,
dimensions and tolerances shall be as given in Annex C.
5.2.2 Dimensional tolerances
5.2.2.1 Tolerances
The dimensional tolerance category shall be declared in accordance with Table 1. The actual deviations for
the mean length, width and height and the actual deviations for individual length, width and height shall not be
greater than the permissible deviations as specified in Table 1 for the declared dimensional tolerance
category.
Actual deviations for the mean are differences between declared work sizes and the mean measured values.
Actual deviations for individual values are differences between the mean measured values and the measured
individual values.
These dimensional tolerances shall not apply to the direction perpendicular to a treated face of
a sliced,
fractured or structured unit.
Table 1 — Dimensional tolerance categories and tolerances for calcium silicate
masonry units (in millimetres)
Dimensional tolerance categories for calcium silicate masonry units
Dimensions
T1 T2 T3 Tm
Mean height of sample work size height work size height —
± 2 ± 1
Mean length of sample work size length work size length work size length
± 2 ± 2 ± 2
Mean width of sample work size width work size width work size width
± 2 ± 2 ± 2
a deviation in mm
declared by the
Individual height mean height of mean height of work size height
manufacturer (may be
sample ± 2 sample ± 1,0 ± 1,0
closer or wider then the
Individual length mean length of mean length of work size length
other categories)
sample ± 2 sample ± 2 ± 3
Individual width mean width of mean width of work size width
sample ± 2 sample ± 2 ± 3
Flatness of bed faces — — 1,0
Plane parallelism of bed faces — — 1,0

5.2.2.2 Flatness of bed faces
When calcium silicate masonry units are sampled from a consignment in accordance with Annex A and tested
in accordance with EN 772-20, the deviation from flatness of the bed faces shall not exceed the declared
value.
5.2.2.3 Plane parallelism of bed faces
When calcium silicate masonry units are sampled from a consignment in accordance with Annex A and tested
in accordance with EN 772-16:2011 by procedure d), the deviation from plane parallelism shall not exceed the
declared value.
5.3 Configuration
When relevant to the uses, for which calcium silicate masonry units are put on the market, the configuration
shall be declared. The declaration may be made by reference to one or another of the groups defined in
EN 1996-1-1 or EN 1996-1-2 and/or it may include one or more items such as those in the following list, as
relevant:
 shape and features, including the direction of perforations (by means of a drawing or illustration, when
relevant);
 volume of all formed voids as a percentage of the length × width × height of the unit;
 volume of the largest of any formed voids as a percentage of the length × width × height of the unit;
 volume of grip holes as a percentage of the length × width × height of the unit;
 thickness of webs;
 thickness of shells;
 combined thickness of webs and shells from face to face;
 combined thickness of webs and shells from header to header;
 area of voids on a bed face as a percentage of the length × width of the unit.
The total volume of frogs shall not exceed 20 % of the overall volume of the unit, i.e. length × width × height.
Each declared value shall be stated as either an upper limit or a lower limit or as a range of values. When
calcium silicate masonry units are sampled from a consignment in accordance with Annex A and tested in
accordance with EN 772-16, EN 772-9 and EN 772-2, the mean value derived from measurements of the test
sample shall be within the range or limit declared.
5.4 Dry density
5.4.1 Gross dry density
The manufacturer shall declare a minimum and a maximum value for the gross dry density. The manufacturer
may declare the gross dry density class according to D.2.
When a specified number of calcium silicate masonry units is sampled from a consignment in accordance with
Annex A and tested and in accordance with EN 772-13, the mean gross density shall comply with this
declared values or declared density class.
Individual values of the sample shall not be out of the declared range of the declared values or the
corresponding range of the declared density class by more than 100 kg/m for units with a declared gross dry
3 3
density greater than 900 kg/m or by more than 50 kg/m for units with a declared gross dry density less than
or equal to 900 kg/m .
5.4.2 Net dry density
If necessary for the intended use the manufacturer shall declare a minimum and a maximum value for the net
dry density. When a specified number of calcium silicate masonry units is sampled from a consignment in
accordance with Annex A and tested in accordance with EN 772-13, the mean net dry density shall comply
with this declared values.
In addition, the manufacturer may declare the minimum and maximum individual values of net dry density.
5.5 Compressive strength
The mean compressive strength and the normalised compressive strength shall be declared by the
manufacturer, e.g. by reference to a class according to D.1.
In addition the manufacturer shall declare whether the calcium silicate masonry unit is Category I or Category
II.
NOTE More information is given in ZA.2 for the purpose of CE marking.
The declaration shall indicate the orientation(s) of the calcium silicate masonry units and the type of specimen
(whole unit or cut prism) as tested, the method(s) of bedding the calcium silicate masonry units and whether
voids present are intended to be fully filled with mortar. The declared value shall be not less than 5 N/mm .
When a specified number of calcium silicate masonry units is sampled from a consignment in accordance with
Annex A and tested in accordance with EN 772-1, the mean normalised compressive strength shall not be
less than the declared value.
When a strength class is declared, the mean normalised compressive strength shall be not less than the value
for the strength class declared.
Individual values of compressive strength as determined in accordance with EN 772-1 shall be not less than
80 % of the declared value.
For calcium silicate masonry units with lengths ≥ 500 mm and/or heights ≥ 300 mm representative portions
may be cut for determination of compressive strength as specified in Annex B. In all other cases, whole
calcium silicate masonry units shall be tested.
The mean value of the compressive strength of three pieces cut according to Annex B from any calcium
silicate masonry unit in a sample shall be not less than 90 % of the declared value.
5.6 Thermal properties
When relevant to the uses for which the units are placed on the market and in all cases for masonry units
intended to be used in elements subject to thermal insulation requirements, the manufacturer shall provide the
mean λ -value and the determination model as prescribed in EN 1745 or alternatively give the gross
10,dry,unit
dry density or net dry density and configuration.
Additionally another fractile may be provided. In such cases both the additional fractile and the corresponding
λ -value shall be given.
10,dry,unit
When the calcium silicate masonry units are sampled in accordance with Annex A and tested in accordance
with EN 1745 following the model provided, then the obtained λ-value of the specified number of calcium
silicate masonry units shall be not greater than the provided λ-value.
When relevant to the use for which the units are placed on the market, the value of specific heat capacity
given in EN 1745 may be provided.
5.7 Durability
For calcium silicate masonry units to be used where there is a risk of freezing and thawing while in a wet
condition, the manufacturer shall declare the freeze/thaw resistance category according to Table 2.
Table 2 — Freeze/thaw categories for calcium silicate masonry units
Criteria F1 F2
Freeze/thaw cycles N
≥ 25 ≥ 50
Significant visual damages according to one of the categories
none none
in EN 772-18:2011, Clause 7
Reduction of compressive strength R according to EN 772-
c
≤ 20 % ≤ 20 %
When a specified number of calcium silicate masonry units is sampled from a consignment in accordance with
Annex A and tested in accordance with EN 772-18, the freeze/thaw resistance shall be confirmed.
For calcium silicate masonry units with lengths ≥ 500 mm and/or heights ≥ 300 mm representative portions
shall be cut for determination of freeze/thaw resistance as specified in Annex B. In all other cases whole
calcium silicate masonry units shall be tested.
5.8 Water vapour permeability
When relevant to the uses for which the calcium silicate masonry unit is placed on the market, the
manufacturer shall provide information on the water vapour permeability through the water vapour diffusion
coefficient tabulated values given in EN 1745 or determined in accordance with EN ISO 12572.
5.9 Reaction to fire
For units intended to be used in elements subject to fire requirements, the manufacturer shall declare the
reaction to fire classification of the masonry unit.
For masonry units containing ≤ 1,0 % by mass or volume (whichever is the most onerous) of homogeneously
distributed organic materials the declaration may be fire Class A1 without the need to test.
Masonry units containing > 1,0 % by mass or volume (whichever is the most onerous) of homogeneously
distributed organic materials shall be classified in accordance with EN 13501-1 and the appropriate reaction to
fire class declared.
NOTE Attention is drawn to the Commission Decision 96/603/EC, as amended by Commission Decision
2000/605/EC, in which non-combustible masonry units containing not more than 1,0 % (by mass or volume whichever is
more onerous) of homogeneously distributed organic materials are classified as reaction to fire Class A1 without testing.
5.10 Water absorption
When relevant to the uses for which the calcium silicate masonry units are placed on the market, the
manufacturer shall declare the water absorption of the masonry units. When sampled in accordance with
Annex A and tested in accordance with EN 772-21, the mean value of the water absorption shall not be
greater than the declared water absorption.
5.11 Moisture movement
When required, moisture movement shall be declared by reference to national provisions in place of the use of
the product.
5.12 Bond strength
5.12.1 General
For calcium silicate masonry units intended to be used in elements subjected to structural requirements the
bond strength of the unit in combination with mortar shall be declared in terms of the characteristic initial shear
strength in accordance with EN 1052-3. The declaration may be made either on the basis of fixed values as in
5.12.2 or tests as in 5.12.3. The manufacturer shall declare whether the value of bond strength has been
obtained from the fixed values or from test.
NOTE In most cases it is expected that the use of fixed values will be sufficient.
5.12.2 Declaration based on fixed values
When no declaration is made under 5.12.3, the characteristic initial shear strength of the unit in combination
with mortar may be declared by reference to EN 998-2:2010, Annex C.
5.12.3 Declaration based on tests
The characteristic initial shear strength of the unit in combination with one or more specific mortars in
accordance with EN 998-2 may be declared based on tests on masonry units sampled from a consignment in
accordance with Annex A and tested in accordance with EN 1052-3. The characteristic initial shear strength
shall not be less than the declared value.
NOTE Bond strength depends on the mortar, the masonry unit and the workmanship.
6 Description, designation and classification of calcium silicate masonry units
6.1 Description and designation
The description and designation of a calcium silicate masonry unit shall comprise at least the following:
a) number and date of issue of this European Standard;
b) work size dimensions (see 5.2.1); for non-rectangular units the slanting angle may be declared;
c) dimensional tolerance category (see 5.2.2);
d) compressive strength (see 5.5);
e) gross dry density (see 5.4.1);
f) configuration (see 5.3).
When relevant to the uses for which the unit is put on the market the description and designation shall include:
g) net dry density (see 5.4.2);
h) volume of voids intended to be fully filled with mortar, in mm (if applicable);
i) thermal properties (see 5.6);
j) durability (see 5.7);
k) water absorption (see 5.10).
6.2 Classification
Specification of the properties of calcium silicate masonry units may be given by reference to classification
systems included in this standard.
This does not remove the requirement that all manufacturers claiming compliance with this standard shall
state declared values of the properties of their products, when required.
7 Marking
The following particulars shall be clearly marked on one of the following: the units, the packaging, the delivery
note or any certificate supplied with the calcium silicate masonry units:
a) name, trademark or other means of identification of the manufacturer;
b) means of identifying the calcium silicate masonry units and relating them to their description and
designation.
NOTE For CE-marking and labelling, see Annex ZA. Where ZA.3 requires the CE marking to be accompanied by the
same information as required by Clause 7 a) and b), the requirement of these clauses can be considered to have been
met.
8 Evaluation of conformity
8.1 General
The manufacturer shall demonstrate compliance for his product with the requirements of this European
Standard and with the declared values for the product properties by carrying out both:
 initial type testing of the product (see 8.2), which can be physical testing, calculation, reference to
tabulated values or combinations of these methods;
 factory production control (see 8.3).
Alternative methods of test to the reference methods specified in this European Standard may be adopted
except for the initial type tests and in case of dispute, provided that these alternative methods satisfy the
following:
a) a correlation can be shown to exist between the results from the reference method and those from the
alternative method; or
b) a safe relationship can be demonstrated when using the alternative method compared to the reference
methods; and
c) the information on which the relationship is based is available.
8.2 Initial type tests
After completion of the development of a new product type and before offering for sale, appropriate initial type
tests shall be carried out to confirm that the properties predicted from the development meet the requirements
of this standard and the values to be declared for the product.
Whenever a major change in the source, blend, or nature of raw materials occurs, or when there is a change
in processing conditions, leading to what the manufacturer considers will constitute a new product type being
produced, the appropriate initial type test shall be repeated.
The manufacturer may define product groups. The product group may differ according to the characteristics in
question.
In the ITT-process a manufacturer may take in consideration already existing results.
A manufacturer may use the ITT results determined by someone else (e.g. another manufacturer or a
Research, Technology & Development service provider) to justify his own declaration of conformity regarding
a product that is manufactured according to the same design and with raw materials, constituents and
manufacturing methods of the same kind, provided that permission is given by the owner of the results, and
the results are valid for both products.
NOTE For the performance characteristics to be determined in order to address the CE marking provisions, see
Table ZA.1.
The tests to be conducted shall be the tests or calculations as described in Table A.1 for the properties
selected from the following list relevant to the manufacturer’s declaration for the product type’s intended use:
 dimensions and dimensional tolerances;
 configuration;
 gross dry density;
 net dry density;
 compressive strength;
 thermal properties (may be established by test or calculation);
 durability;
 water vapour permeability (may be established by test or calculation);
 water absorption;
 bond strength (may be established by test or from fixed values).
Sampling for initial type testing shall be in accordance with Annex A.
The results of initial type tests shall be recorded.
8.3 Factory production control
8.3.1 General
The manufacturer shall establish, document and maintain a factory production control system to enable
continuing conformity with this European Standard and the declared values of the products placed on the
market.
The factory production control system may consist of procedures related to the process only (full process
control and consequently no finished product testing, i.e. 8.3.6 does not apply), to finished products only
(consequently no process control, i.e. 8.3.5 does not apply) or any combination of both. Consequently
conformity criteria depend on the individual factory production procedures.
As appropriate, the responsibility, authority and interrelation of all personnel who manage, perform and verify
work affecting the quality of masonry unit products shall be established.
The factory production control system shall describe the control procedure of production, the regular checks
by the manufacturer and his testing, depending on the combination of the procedures related to process
control and/or finished product testing. Controls and tests may include the characteristics of raw materials and
finished products, the procedure of production, the production equipment or the production machines, the test
equipment or the testing instruments and the marking of the product.
The test results shall be recorded.
Actions to be taken when the control test values or criteria do not meet those specified should be documented
by the manufacturer.
For Category I masonry units the factory production control system shall be designed so that the probability of
failure to reach the declared compressive strength is not exceeding 5 % corresponding to 95 % confidence
level.
8.3.2 Testing and measuring equipment
All relevant weighing, measuring and testing equipment, that has an influence on the declared values, shall be
verified and regularly inspected.
8.3.3 Production Equipment
When the factory production control system includes process control procedures all production equipment,
that forms part of these procedures and has an influence on the declared values, shall be regularly inspected.
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