SIST EN ISO 10426-1:2010

SLOVENSKI STANDARD
01-februar-2010
1DGRPHãþD
SIST EN ISO 10426-1:2007
Industrija za predelavo nafte in zemeljskega plina - Cementi in materiali za
cementiranje vrtin - 1. del: Specifikacija (ISO 10426-1:2009)
Petroleum and natural gas industries - Cements and materials for well cementing - Part
1: Specification (ISO 10426-1:2009)
Erdöl- und Erdgasindustrie - Zemente und Materialien für die Zementation von
Tieflochbohrungen - Teil 1: Anforderungen (ISO 10426-1:2009)
Industries du pétrole et du gaz naturel - Ciments et matériaux pour la cimentation des
puits - Partie 1: Spécifications (ISO 10426-1:2009)
Ta slovenski standard je istoveten z: EN ISO 10426-1:2009
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
91.100.10 Cement. Mavec. Apno. Malta Cement. Gypsum. Lime.
Mortar
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 10426-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2009
ICS 91.100.10; 75.020 Supersedes EN ISO 10426-1:2006
English Version
Petroleum and natural gas industries - Cements and materials
for well cementing - Part 1: Specification (ISO 10426-1:2009)
Industries du pétrole et du gaz naturel - Ciments et Erdöl- und Erdgasindustrie - Zemente und Materialien für
matériaux pour la cimentation des puits - Partie 1: die Zementation von Tieflochbohrungen - Teil 1:
Spécification (ISO 10426-1:2009) Anforderungen (ISO 10426-1:2009)
This European Standard was approved by CEN on 14 December 2009.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10426-1:2009: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 10426-1:2009) has been prepared by Technical Committee ISO/TC 67 "Materials,
equipment and offshore structures for petroleum, petrochemical and natural gas industries" in collaboration
with Technical Committee CEN/TC 12 “Materials, equipment and offshore structures for petroleum,
petrochemical and natural gas industries” the secretariat of which is held by AFNOR.
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 June 2010, and conflicting national standards shall be withdrawn at
the latest by June 2010.
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 ISO 10426-1:2006.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 10426-1:2009 has been approved by CEN as a EN ISO 10426-1:2009 without any
modification.
INTERNATIONAL ISO
STANDARD 10426-1
Third edition
2009-12-15
Petroleum and natural gas industries —
Cements and materials for well
cementing —
Part 1:
Specification
Industries du pétrole et du gaz naturel — Ciments et matériaux pour la
cimentation des puits —
Partie 1: Spécification
Reference number
ISO 10426-1:2009(E)
©
ISO 2009
ISO 10426-1:2009(E)
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©  ISO 2009
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ii © ISO 2009 – All rights reserved

ISO 10426-1:2009(E)
Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Normative references.1
3 Terms and definitions .2
4 Requirements.3
4.1 Specification, chemical and physical requirements.3
4.2 Sampling frequency, timing of tests, and equipment.7
5 Sampling procedure.8
6 Fineness tests.8
6.1 Procedure.8
6.2 Requirements.8
7 Preparation of slurry for free fluid, compressive strength and thickening time tests.8
7.1 Apparatus.8
7.2 Procedure.11
8 Free-fluid test (formerly free water) .11
8.1 Apparatus.11
8.2 Calibration.16
8.3 Procedure.17
8.4 Calculation of percent free fluid .17
8.5 Acceptance requirements.18
9 Compressive strength tests .18
9.1 Apparatus.18
9.2 Procedure.19
9.3 Test procedure (after ASTM C109/C109M).21
9.4 Compressive strength acceptance criteria.21
10 Thickening-time tests.22
10.1 Apparatus.22
10.2 Calibration.28
10.3 Procedure.31
10.4 Thickening time and consistency.33
10.5 Specification acceptance requirements.33
11 Marking.33
12 Packing.34
13 Bentonite .34
Annex A (informative) Calibration procedures for thermocouples, temperature measuring
systems, and controllers .35
Bibliography.38

ISO 10426-1:2009(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 10426-1 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures
for petroleum, petrochemical and natural gas industries, Subcommittee SC 3, Drilling and completion fluids,
and well cements.
This third edition cancels and replaces the second edition (ISO 10426-1:2005), which has been technically
revised.
ISO 10426 consists of the following parts, under the general title Petroleum and natural gas industries —
Cements and materials for well cementing:
⎯ Part 1: Specification
⎯ Part 2:Testing of well cements
⎯ Part 3: Testing of deepwater well cement formulations
⎯ Part 4: Preparation and testing of foamed cement slurries at atmospheric pressure
⎯ Part 5: Determination of shrinkage and expansion of well cement formulations at atmospheric pressure
⎯ Part 6: Methods for determining the static gel strength of cement formulations

iv © ISO 2009 – All rights reserved

ISO 10426-1:2009(E)
Introduction
This part of ISO 10426 is based on ISO 10426-1:2005 with the intent that the 24th edition of API Spec 10A will
be identical to this part of ISO 10426.
It is necessary that users of this part of ISO 10426 be aware that further or differing requirements can be
required for individual applications. This part of ISO 10426 is not intended to inhibit a vendor from offering, or
the purchaser from accepting, alternative equipment or engineering solutions for the individual application.
This can be particularly applicable where there is innovative or developing technology. Where an alternative is
offered, it is the responsibility of the vendor to identify any variations from this part of ISO 10426 and provide
details.
In this part of ISO 10426, where practical, US Customary (USC) or other units are included in brackets for
information. The units do not necessarily represent a direct conversion of SI to USC units, or USC to SI.
Consideration has been given to the precision of the instrument making the measurement. For example,
thermometers are typically marked in 1° increments, thus temperature values have been rounded to the
nearest degree.
In this part of ISO 10426, calibrating an instrument refers to assuring the accuracy of the measurement.
Accuracy is the degree of conformity of a measurement of a quantity to its actual or true value. Accuracy is
related to precision, or reproducibility, of a measurement. Precision is the degree to which further
measurements or calculations will show the same or similar results. Precision is characterized in terms of the
standard deviation of the measurement. The results of calculations or a measurement can be accurate, but
not precise, precise but not accurate, neither or both. A result is valid if it is both accurate and precise.

INTERNATIONAL STANDARD ISO 10426-1:2009(E)

Petroleum and natural gas industries — Cements and materials
for well cementing —
Part 1:
Specification
1 Scope
This part of ISO 10426 specifies requirements and gives recommendations for six classes of well cements,
including their chemical and physical requirements and procedures for physical testing.
This part of ISO 10426 is applicable to well cement classes A, B, C and D, which are the products obtained by
grinding Portland cement clinker and, if needed, calcium sulfate as an interground additive. Processing
additives can be used in the manufacture of cement of these classes. Suitable set-modifying agents can be
interground or blended during manufacture of class D cement.
This part of ISO 10426 is also applicable to well cement classes G and H, which are the products obtained by
grinding clinker with no additives other than one or more forms of calcium sulfate, water or chemical additives
as required for chromium (VI) reduction.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 3310-1, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth
ISO 13500, Petroleum and natural gas industries — Drilling fluid materials — Specifications and tests
ISO 24450, Laboratory glassware — Wide-necked boiling flasks
ASTM C109/C109M, Standard Test Method for Compressive Strength of Hydraulic Cement Mortars
(Using 2-in or [50-mm] Cube Specimens)
ASTM C115, Standard Test Method for Fineness of Portland Cement by the Turbidimeter
ASTM C465, Standard Specification for Processing Additions for Use in the Manufacture of Hydraulic
Cements
ASTM E1404-94(2008), Standard Specification for Laboratory Glass Conical Flasks
EN 196-1, Methods of testing cement — Part 1: Determination of strength
EN 196-2, Methods of testing cement — Part 2: Chemical analysis of cement
EN 196-6, Methods of testing cement — Part 6: Determination of fineness
EN 196-7, Methods of testing cement — Part 7: Methods of taking and preparing samples of cement
ISO 10426-1:2009(E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
additive
material added to a cement slurry to modify or enhance some desired property
NOTE Properties that are commonly modified include setting time (by use of retarders or accelerators), fluid loss,
viscosity, etc.
3.2
atmospheric pressure consistometer
device used for stirring and conditioning the cement slurry
NOTE The device is not intended to measure thickening time.
3.3
Bearden unit of consistency
B
c
measure of the consistency of a cement slurry when determined on a pressurized consistometer
3.4
cement
Portland cement
ground clinker generally consisting of hydraulic calcium silicates and aluminates and usually containing one or
more forms of calcium sulfate as an interground additive
3.5
cement class
designation achieved under the ISO system for classification of well cement according to its intended use
3.6
cement grade
designation achieved under the ISO system for denoting the sulfate resistance of a particular cement
3.7
cement blend
mixture of dry cement and other dry materials
3.8
clinker
fused materials produced in the kiln during cement manufacturing that are interground with calcium sulfate to
make cement
3.9
compressive strength
force per unit area required to cause a set cement sample to fail under compression
3.10
consistometer
device used to measure the thickening time of a cement slurry under temperature and under pressure
3.11
filtrate
liquid that is forced out of a cement slurry during a fluid loss test
2 © ISO 2009 – All rights reserved

ISO 10426-1:2009(E)
3.12
free fluid
coloured or colourless liquid that separates from a cement slurry under static conditions
3.13
slurry container
slurry cup
container in an atmospheric or pressurized consistometer used to hold the slurry for conditioning purposes or
for the thickening-time test
3.14
thickening time
time after which the consistency of a cement slurry has become so high that the slurry is considered
unpumpable
NOTE The results of a thickening-time test provide an indication of the length of time a cement slurry remains
pumpable under the test conditions.
4 Requirements
4.1 Specification, chemical and physical requirements
4.1.1 Classes and grades
4.1.1.1 General
Well cement shall be specified using classes A, B, C, D, G and H and the grades: ordinary (O), moderate
sulfate-resistant (MSR) and high sulfate-resistant (HSR).
A well cement that has been manufactured and supplied in accordance with this part of ISO 10426 may be
mixed and placed in the field using water ratios or additives at the user's discretion. It is not intended that
manufacturing compliance with this part of ISO 10426 be based on such field conditions.
Processing additives, set modifying agents or chemical additives used to reduce chromium (VI) shall not
prevent a well cement from performing its intended functions.
4.1.1.2 Class A
This product is obtained by grinding clinker, consisting essentially of hydraulic calcium silicates, usually
containing one or more forms of calcium sulfate as an interground additive. At the option of the manufacturer,

processing additives may be used in the manufacture of class A cement, provided that such materials in the
amounts used have been shown to meet the requirements of ASTM C465.
This product is intended for use when special properties are not required and is available only in O grade,
similar to ASTM C150, type I.
4.1.1.3 Class B
This product is obtained by grinding clinker, consisting essentially of hydraulic calcium silicates, usually
containing one or more forms of calcium sulfate as an interground additive. At the option of the manufacturer,
processing additives may be used in the manufacture of class B cement, provided that such materials in the
amounts used have been shown to meet the requirements of ASTM C465.
This product is intended for use when conditions require moderate or high sulfate resistance and is available
in both MSR and HSR grades, similar to ASTM C150, type II.
ISO 10426-1:2009(E)
4.1.1.4 Class C
This product is obtained by grinding clinker, consisting essentially of hydraulic calcium silicates, usually
containing one or more forms of calcium sulfate as an interground additive. At the option of the manufacturer,
processing additives may be used in the manufacture of class C cement, provided that such materials in the
amounts used have been shown to meet the requirements of ASTM C465.
This product is intended for use when conditions require high, early strength and is available in O, MSR and
HSR grades, similar to ASTM C150, type III.
4.1.1.5 Class D
This product is obtained by grinding clinker, consisting essentially of hydraulic calcium silicates, usually
containing one or more forms of calcium sulfate as an interground additive. At the option of the manufacturer,
processing additives may be used in the manufacture of class D cement, provided that such materials in the
amounts used have been shown to meet the requirements of ASTM C465. Further, at the option of the
manufacturer, suitable set-modifying agents may be interground or blended during manufacture.
This product is intended for use under conditions of moderately high temperatures and pressures and is
available in MSR and HSR grades.
4.1.1.6 Class G
This product is obtained by grinding clinker, consisting essentially of hydraulic calcium silicates, usually
containing one or more forms of calcium sulfate as an interground additive. No additives other than calcium
sulfate or water, or both, shall be interground or blended with the clinker during manufacture of class G well
cement.
This product is intended for use as a basic well cement and is available in MSR and HSR grades.
4.1.1.7 Class H
This product is obtained by grinding clinker, consisting essentially of hydraulic calcium silicates, usually
containing one or more forms of calcium sulfate as an interground additive. No additives other than calcium
sulfate or water, or both, shall be interground or blended with the clinker during manufacture of class H well
cement.
This product is intended for use as a basic well cement and is available in MSR and HSR grades.
4.1.2 Chemical requirements
Well cements shall conform to the respective chemical requirements of classes and grades referenced in
Table 1. It is not intended that this manufacturing compliance be applicable to field conditions. This part of
ISO 10426 is not applicable to the use of cements that do not conform to the chemical requirements of
classes and grades as set forth in Table 1.
Chemical analyses of hydraulic cements shall be carried out as specified in EN 196-2.
NOTE For the purposes of this provision, ASTM C114 is equivalent to EN 196-2.
4 © ISO 2009 – All rights reserved

ISO 10426-1:2009(E)
Table 1 — Chemical requirements
Cement class
A B C D G H
Ordinary grade (O)
a
Magnesium oxide (MgO), maximum, percent 6,0 NA 6,0 NA NA NA
b
Sulfur trioxide (SO ), maximum, percent 3,5 NA 4,5 NA NA NA
Loss on ignition, maximum, percent 3,0 NA 3,0 NA NA NA
Insoluble residue, maximum, percent 0,75 NA 0,75 NA NA NA
d c
Tricalcium aluminate (C A), maximum, percent NR NA 15 NA NA NA
Moderate sulfate-resistant grade (MSR)
Magnesium oxide (MgO), maximum, percent NA 6,0 6,0 6,0 6,0 6,0
b
Sulfur trioxide (SO ), maximum, percent NA 3,0 3,5 3,0 3,0 3,0
Loss on ignition, maximum, percent NA 3,0 3,0 3,0 3,0 3,0
Insoluble residue, maximum, percent NA 0,75 0,75 0,75 0,75 0,75
d
Tricalcium silicate (C S) maximum, percent NA NR NR NR 58 58
d
minimum, percent NA NR NR NR 48 48
d
Tricalcium aluminate (C A), maximum percent NA 8 8 8 8 8
Total alkali content, expressed as sodium oxide
NA NR NR NR 0,75 0,75
e
(Na O) equivalent, maximum, percent
High sulfate-resistant grade (HSR)
Magnesium oxide (MgO), maximum, percent NA 6,0 6,0 6,0 6,0 6,0
b
Sulfur trioxide (SO ), maximum, percent NA 3,0 3,5 3,0 3,0 3,0
Loss on ignition, maximum, percent NA 3,0 3,0 3,0 3,0 3,0
Insoluble residue, maximum, percent NA 0,75 0,75 0,75 0,75 0,75
d
Tricalcium silicate (C S) maximum, percent NA NR NR NR 65 65
d
minimum, percent NA NR NR NR 48 48
d
Tricalcium aluminate (C A), maximum, percent NA 3 3 3 3 3
Tetracalcium aluminoferrite (C AF) plus twice the
NA 24 24 24 24 24
d
tricalcium aluminate (C A), maximum, percent
Total alkali content expressed as sodium oxide (Na O)
NA NR NR NR 0,75 0,75
e
equivalent, maximum, percent
a
NA indicates “not applicable”.
b
When the tricalcium aluminate content (expressed as C A) of the cement is 8 % or less, the maximum SO content shall be 3 %, or
3 3
3,5 % for class C cement.
c
NR indicates “no requirement”.
d
The expressing of chemical limitations by means of calculated assumed compounds does not necessarily mean that the oxides are
actually or entirely present as such compounds. The compounds are calculated according to the ratio of the mass percentages of Al O
2 3
to Fe O , where w is the percentage mass fraction of the compound indicated in the subscript:
2 3
— When w /w is greater than 0,64, the compounds shall be calculated as follows:
Fe O
Al O
2 3 2 3
C A = 2,65w − 1,69w
3 O Fe O
Al
2 3 2 3
C S = 4,07w − 7,60w − 6,72w − 1,43w − 2,85w
3 SiO
CaO Al O Fe O SO
2 2 3 2 3 3
C AF = 3,04w
Fe O
2 3
— When w /w is 0,64 or less, the C A content is zero.
Al O Fe O 3
2 3 2 3
— The C S and C AF shall be calculated as follows:
3 4
C S = 4,07w − 7,60w − 4,48w − 2,86w − 2,85w
CaO SiO Al O Fe O SO
2 2 3 2 3 3
C AF = 3,04w
4 Fe O
2 3
e
The sodium oxide equivalent, expressed as Na O equivalent, shall be calculated by the formula:
Na O equivalent is equal to 0,658w + w .
K O Na O
2 2
ISO 10426-1:2009(E)
4.1.3 Physical and performance requirements
Well cement shall conform to the respective physical and performance requirements specified in Table 2 and
in Clauses 6 through 10.
Table 2 — Summary of physical and performance requirements
Well cement class A B C D G H
Mix water, % mass fraction of cement (Table 5) 46 46 56 38 44 38
Fineness tests (alternative methods) (Clause 6)
a
Turbidimeter (specific surface, minimum, m /kg)
150 160 220 NR NR
NR
Air permeability (specific surface, minimum, m /kg) 280 280 400 NR NR NR
Free-fluid content, maximum, percent (Clause 8) NR NR NR NR 5,9 5,9
Compressive Schedule Final curing Curing Minimum compressive strength
strength test number temperature pressure MPa (psi)
(8 h curing time) Table 6 °C (°F) MPa (psi)
b
(Clause 9) 38 (100) atm. 1,7 1,4 2,1 NR 2,1 2,1
NA
(250) (200) (300) (300) (300)
(Clause 9) NA 60 (140) atm. NR NR NR NR 10,3 10,3
(1 500) (1 500)
(Clause 9) 6S 110 (230) 20,7 NR NR NR 3,4 NR NR
(3 000) (500)
Compressive Schedule Final curing Curing Minimum compressive strength
strength test number temperature pressure MPa (psi)
(24 h curing (Table 6) °C (°F) MPa (psi)
time)
(Clause 9) NA 38 (100) atm. 12,4 10,3 13,8 NR NR NR
(1 800) (1 500) (2 000)
(Clause 9) 4S 77 (170) 20,7 NR NR NR 6,9 NR NR
(3 000) (1 000)
(Clause 9) 6S 110 (230) 20,7 NR NR NR 13,8 NR NR
(3 000) (2 000)
Thickening- Specifi- Maximum consistency Thickening time (minimum/maximum)
time test cation test (15 min to 30 min stirring min
c
schedule period) B
c
number
Tables 9
through 11
d d d d
(Clause 10) 4 30 90 90 90 90 NR NR
d d
(Clause 10) 5 30 NR NR NR NR 90 90
e e
(Clause 10) 5 30 NR NR NR NR 120 120
d
(Clause 10) 6 30 NR NR NR 100 NR NR
a
NR indicates “no requirement”.
b
NA indicates “not applicable”.
c
Bearden units of consistency, B , obtained on a pressurized consistometer as defined in Clause 10 and calibrated in accordance
c
with the same clause.
d
Minimum thickening time.
e
Maximum thickening time.
6 © ISO 2009 – All rights reserved

ISO 10426-1:2009(E)
4.2 Sampling frequency, timing of tests, and equipment
4.2.1 Sampling frequency
4.2.1.1 For well cement classes C, D, G, and H, a sample for testing shall be taken by either of the following
methods:
a) over an interval of 24 h;
b) on a 1 000 ton (maximum) production run.
4.2.1.2 For well cement classes A and B, a sample for testing shall be taken by either of the following
methods:
a) over a 14-day interval;
b) on a 25 000 ton (maximum) production run.
4.2.1.3 These samples shall represent the product as produced. At the choice of the manufacturer, either
sampling method may be used.
4.2.2 Time from sampling to testing
Each sample shall be tested for conformance to this part of ISO 10426. All tests shall be completed within
seven working days after sampling.
4.2.3 Specified equipment
Equipment used for testing well cements shall comply with Table 3. Dimensions shown in Figures 5 through 7
and Figures 10 through 12 are for the purposes of manufacturing the cement-specification test equipment.
Dimensional recertification is not required.
4.2.4 Calibration
Equipment calibrated in accordance with the requirements of this part of ISO 10426 is considered accurate if
the calibration is within the specified limits.
Table 3 — Specification test equipment for well-cement manufacturers
Test or preparation Well cement Clause Required equipment
classes reference
Sampling All 5 Apparatus as specified in EN 196-7
NOTE For the purposes of this provision, ASTM C183 is equivalent to
EN 196-7.
Fineness A, B, C 6 Turbidimeter and auxiliary equipment as specified in ASTM C115 or
air permeability apparatus and auxiliary equipment as specified in
EN 196-6.
NOTE For the purposes of this provision, ASTM C204 is equivalent to
EN 196-6.
Slurry preparation All 7 Apparatus as specified in 7.1
Free fluid G, H 8 Apparatus as specified in 8.1
Atmospheric pressure A, B, C, G, H 9 Apparatus as specified in 9.1, except pressure vessel of 9.1.3.2
compressive strength
Pressure cured D 9 Apparatus as specified in 9.1,except curing bath of 9.1.3.3
compressive strength
Thickening time All 10 Pressurized consistometer specified in 10.1
ISO 10426-1:2009(E)
5 Sampling procedure
One or more of the procedures in accordance with EN 196-7 shall be used to secure a sample of well cement
for specification testing purposes.
NOTE For the purposes of this provision, ASTM C183 is equivalent to EN 196-7.
6 Fineness tests
6.1 Procedure
Tests for fineness of well cement shall be carried out in accordance with either the procedure in ASTM C115
for the turbidimeter test or the procedure in EN 196-6 by air permeability apparatus for the air permeability test.
NOTE For the purposes of this provision, ASTM C204 is equivalent to EN 196-6.
6.2 Requirements
Acceptance requirements for the fineness test are a minimum specific surface area (expressed in square
metres per kilogram) as given in Table 2. Classes D, G and H cements have no fineness requirement.
At the discretion of the manufacturer, either of the two fineness test methods (turbidimeter or air permeability
test) shall be used to determine the fineness.
7 Preparation of slurry for free-fluid, compressive strength and thickening-time
tests
7.1 Apparatus
7.1.1 Scales
The indicated load on scales shall be accurate within 0,1 % of the indicated load. Annual calibration is
required.
7.1.2 Mass of reference weights
The mass of the reference weights shall be accurate to within the tolerance shown in Table 4. On beam-type
scales where the reference weights are on the beam, the indicated masses shall conform to the requirements
given in 7.1.1.
Table 4 — Permissible variation in mass of reference weights
Mass Permissible variation
g g
1 000 ± 1,00
500 ± 0,50
300 ± 0,30
200 ± 0,20
100 ± 0,10
50 ± 0,05
8 © ISO 2009 – All rights reserved

ISO 10426-1:2009(E)
7.1.3 Sieves
A No. 20 wire cloth sieve (openings 850 µm), in accordance with the requirements given in ISO 3310-1, shall
be used for sieving cement prior to slurry preparation.
NOTE For the purposes of this provision, ASTM E11 is equivalent to ISO 3310-1.
7.1.4 Mixing devices
The mixing device for the preparation of well cement slurries shall be a 1 l (1 qt) size, bottom-drive, blade-type
mixer.
An example of a mixing device in common use is shown in Figure 1. The mixing-blade assembly and mixing
container shall be constructed of durable, corrosion-resistant material. The mixing-blade assembly (see
Figure 2) shall be constructed in such a manner that the blade can be removed for weighing and changing.
The mixing blade shall be weighed initially and thereafter periodically, and replaced with an unused blade
before a 10 % mass loss has occurred. Replace the blade if obvious blade deformation has occurred. If the
mixing device leaks at any time during the mixing procedure, the contents shall be discarded, the leak shall be
repaired and the procedure shall be restarted.
The mixing device shall be calibrated annually to a tolerance of ± 200 r/min (± 3,3 r/s) at 4 000 r/min (66,7 r/s)
rotational speed, and ± 500 r/min (± 8,3 r/s) at 12 000 r/min (200 r/s) rotational speed.
ISO 10426-1:2009(E)
Figure 1 — Example of a typical cement-mixing device

Figure 2 — Mixing-blade assembly
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ISO 10426-1:2009(E)
7.2 Procedure
7.2.1 Sieving
Prior to mixing, the cement shall be sieved using the method described in EN 196-7 using a sieve defined in
7.1.3.
NOTE For the purposes of this provision, ASTM C183 is equivalent to EN 196-7.
7.2.2 Temperature of water and cement
The temperature of the mix water in the container within 60 s prior to mixing shall be 23 °C ± 1 °C
(73 °F ± 2 °F) and the temperature of the cement within 60 s prior to mixing shall be 23 °C ± 1 °C
(73 °F ± 2 °F).
7.2.3 Mix water
Distilled or de-ionized water shall be used for testing. The mix water shall be weighed directly into a clean, dry
mixing container. No water shall be added to compensate for evaporation, wetting, etc.
7.2.4 Mixing quantities
The quantities of slurry component shown in Table 5 shall be used for testing. The use of the quantities of
components shown in Table 5 results in mix-water percentages (based on the mass of dry cement) consistent
with water percentages shown in Table 2.
Table 5 — Slurry requirements
Components Classes A and B Class C Classes D and H Class G
g g g g
Mix water
355 ± 0,5 383 ± 0,5 327 ± 0,5 349 ± 0,5
Cement 772 ± 0,5 684 ± 0,5 860 ± 0,5 792 ± 0,5
7.2.5 Mixing cement and water
The mixing container with the required mass of mix water, as specified in Table 5, shall be placed on the
mixer base, the motor turned on and maintained at 4 000 r/min ± 200 r/min (66,7 r/s ± 3,3 r/s) while the
cement sample is added at a uniform rate during no more than 15 s. After 15 s at 4 000 r/min ± 200 r/min
(66,7 r/s ± 3,3 r/s), place the cover on the mixing container and continue mixing at 12 000 r/min ± 500 r/min
(200 r/s ± 8,3 r/s) for 35 s ±1 s.
8 Free-fluid test (formerly free water)
8.1 Apparatus
8.1.1 Consistometer
The atmospheric pressure consistometer or the pressurized consistometer described in 10.1 (run at
atmospheric pressure) shall be used for stirring and conditioning the cement slurry for the determination of
free-fluid content. The atmospheric consistometer consists of a rotating cylindrical slurry container, equipped
with an essentially stationary paddle assembly, in a temperature-controlled liquid bath. It shall be capable of
maintaining the temperature of the bath at 27 °C ± 2 °C (80 °F ± 3 °F) and of rotating the slurry container at a
speed of 150 r/min ±15 r/min (2,5 r/s ± 0,25 r/s) during the stirring and conditioning period for the slurry. The
ISO 10426-1:2009(E)
paddle and all parts of the slurry container exposed to the slurry shall be constructed of corrosion-resistant
materials. See Figures 3 through 6.

Key
1 lid (see Figure 4)
2 fill indicating groove
3 slurry container (see Figure 5)
4 paddle (see Figure 6)
Figure 3 — Typical container assembly for an atmospheric pressure consistometer
12 © ISO 2009 – All rights reserved

ISO 10426-1:2009(E)
Key
1 cap lock nut 7 collar
2 centre lock reverse jam nut 8 bearing
3 dial 9 retaining ring
4 pointer 10 lid
5 dial and base assembly 11 roll pin
6 spring 12 shaft
Figure 4 — Typical lid and mechanism for an atmospheric pressure consistometer
ISO 10426-1:2009(E)
Dimensions in millimetres (inches) unless otherwise indicated

Key
1 two slots 180° apart
2 fill-level indicating groove
3 pivot bearing
4 opposite side
a
Typical.
Figure 5 — Typical container for an atmospheric pressure consistometer
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ISO 10426-1:2009(E)
Dimensions in millimetres (inches) unless otherwise indicated

a
Paddle material is 300 series stainless steel 1,0 mm × 7,9 mm (0,04 in × 0,313 in).
b
Shaft material is 400 series steel 6,4 mm × 211,1 mm (0,25 in × 8,313 in) annealed and ground.
c
Typical.
Figure 6 — Typical paddle for an atmospheric pressure consistometer
ISO 10426-1:2009(E)
8.1.2 Scales
Scales shall meet the requirements set in 7.1.1.
8.1.3 Test flask
A 500 ml conical flask, in accordance with ASTM E1404-94(2008), type I, class 2, or with ISO 24450 shall be
used. See Figure 7.
Dimensions in millimetres
a
Wall thickness.
b
Outside diameter (at widest point).
NOTE The conical flask for free-fluid measurement is an ASTM conical flask, type 1, class 2, with a capacity of 500 ml.
Figure 7 — The ASTM conical flask for free-fluid measurement
8.2 Calibration
8.2.1 Temperature measuring system
Temperature-measuring and -controlling devices shall be calibrated no less frequently than quarterly. This
includes thermometers, thermocouples and temperature controllers on consistometers, curing chambers and
ultrasonic devices, and those that are used separate from or are not an integral part of the instrument.
Measurements shall be made at no fewer than three temperatures spanning the manufacturer- or user-
defined operating range of the equipment on or with which the device is used. The lowest temperature
calibrated shall be no more than 5 °C (10 °F) above the minimum and the highest temperature calibrated shall
be no more than 5 °C (10 °F) below the maximum of the user-defined operating range of the instrument.
Thermometers or thermocouples shall be calibrated by the use of a known temperature source (such as a
heat block) with a thermometer or thermocouple that is certified and traceable to a national standardization
body. Accuracy shall be within 2 °C (3 °F). If the error in the thermometer or thermocouple is greater than that,
it shall be replaced by one meeting the accuracy requirements. Thermocouples mounted in the cylinder wall of
a consistometer, if not used for controlling the temperature in the consistometer, are exempt from calibration.
More detailed information can be found in Annex A.
8.2.2 Slurry container rotational speed
The rotational speed shall be 150 r/min ± 15 r/min (2,5 r/s ± 0,25 r/s). The rotational speed of the slurry
container shall be checked no less frequently than quarterly, and corrected if found to be outside this range.
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ISO 10426-1:2009(E)
8.2.3 Timer
The timer shall be accurate to within ± 30 s per hour. It shall be checked for accuracy no less frequently than
annually, and corrected or replaced if found to be less accurate.
8.3 Procedure
8.3.1 Prepare the slurry in accordance with the procedure in Clause 7.
8.3.2 Fill a clean and dry consistometer slurry container
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