prEN 13696

• Abstract:

  This document specifies a test method to determine the resistance to wear of lacquered wood floorings, a method to test the elasticity of the lacquer and a method to determine resistance to impact of lacquered wood floorings.

• Status: Not Published
• Publication Date: 02-Aug-2027
• ICS: 79.080 - Semi-manufactures of timber
• ICS: 97.150 - Floor coverings
• Technical Committee: CEN/TC 175 - Round and sawn timber
• Drafting Committee: CEN/TC 175/WG 33 - Specific user requirements - Timber in flooring
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 09-Jul-2026
• Due Date: 19-Mar-2026
• Completion Date: 09-Jul-2026
• Ref Project: oSIST prEN 13696:2026 - Wood flooring - Test methods to determine elasticity and resistance to wear and impact resistance and scratching/scraping

• Revises: EN 13696:2008 - Wood flooring - Test methods to determine elasticity and resistance to wear and impact resistance
• Effective Date: 26-Jun-2024

SLOVENSKI STANDARD
01-september-2026
Lesene talne obloge - Preskusne metode za ugotavljanje elastičnosti in odpornosti
proti obrabi ter odpornosti proti udarcu in razenju/strganju
Wood flooring - Test methods to determine elasticity and resistance to wear and impact
resistance and scratching/scraping
Holzfußböden - Prüfverfahren zur Bestimmung der Verformbarkeit und der Beständigkeit
gegen Verschleiß und gegen Stoßbeanspruchung
Planchers en bois - Méthodes d'essai pour déterminer l'élasticité et la résistance à
l'abrasion et la résistance au chocs
Ta slovenski standard je istoveten z: prEN 13696
ICS:
79.080 Polizdelki iz lesa Semi-manufactures of timber
97.150 Talne obloge Floor coverings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2026
ICS 97.150 Will supersede EN 13696:2008
English Version
Wood flooring - Test methods to determine elasticity and
resistance to wear and impact resistance and
scratching/scraping
Planchers en bois - Méthodes d'essai pour déterminer Holzfußböden - Prüfverfahren zur Bestimmung der
l'élasticité et la résistance à l'abrasion et la résistance Verformbarkeit und der Beständigkeit gegen
au chocs Verschleiß und gegen Stoßbeanspruchung
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 175.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

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

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13696:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Common methods . 6
4.1 Conditioning . 6
4.1.1 Equipment . 6
4.1.2 Procedure. 7
4.2 Measurement of the thickness of the lacquer . 7
4.2.1 Equipment . 7
4.2.2 Sampling . 7
4.2.3 Procedure. 7
4.2.4 Expression of the results . 7
5 Falling sand wear resistance method . 7
5.1 Principle . 7
5.2 Sampling . 8
5.3 Conditioning . 8
5.4 Apparatus testing machine . 8
5.4.1 General . 8
5.4.2 Test piece holder . 8
5.4.3 Holding and lifting device . 8
5.4.4 Revolution-counter . 9
5.5 Grit feeder and accessories . 9
5.5.1 General . 9
5.5.2 Vacuum cleaning device. 9
5.5.3 Abrading material . 12
5.5.4 Leather abrading wheels . 12
5.5.5 Stopwatch . 13
5.5.6 Grit collection container . 13
5.5.7 Calibration plates . 13
5.5.8 Transparent template to evaluate the wear of the abraded area. 13
5.5.9 Weighing equipment . 13
5.5.10 Contrast marking solutions . 14
5.6 Procedure. 14
5.6.1 General . 14
5.6.2 Maintenance of the abrading wheels . 14
5.6.3 Operation of the abrader . 14
5.6.4 Calibration . 14
5.6.5 Expression of the result for a test piece . 16
5.7 Test report . 17
6 Sand paper wear resistance method . 17
6.1 Principal . 17
6.2 Sampling . 17
6.3 Conditioning . 18
6.4 Apparatus . 18
6.4.1 Testing machine . 18
6.4.2 Additional material or equipment . 21
6.5 Procedure . 21
6.5.1 General . 21
6.5.2 Preparation of test specimens and abrasive papers . 22
6.5.3 Preparation of abrasive wheels . 22
6.5.4 Determination of the abrasion rate of abrasive paper . 22
6.5.5 Abrasion of test specimen . 22
6.5.6 Expression of results . 24
6.5.7 Test report . 24
7 Elasticity of the lacquer . 25
7.1 Principle . 25
7.2 Equipment . 25
7.2.1 Equipment to measure the thickness of the lacquer . 25
7.2.2 Indentation plate (see Figure 2) . 25
7.2.3 Loading machine . 27
7.2.4 Magnifying glass and lighting equipment . 27
7.3 Test piece . 27
7.3.1 Dimensions . 27
7.3.2 Sampling . 27
7.3.3 Conditioning . 27
7.4 Procedure . 27
7.4.1 Measurement of the thickness of the lacquer . 27
7.4.2 Elasticity . 27
7.5 Expression of the results for a test piece . 28
7.5.1 Thickness of the lacquer . 28
7.5.2 Elasticity . 28
7.6 Expression of the result for a batch . 28
7.6.1 Thickness of the lacquer . 28
7.6.2 Elasticity . 28
7.7 Test report . 28
8 Determination of resistance to scratching and scraping . 29
8.1 Principle . 29
8.2 Terms and definitions . 29
8.2.1 Film forming coating . 29
8.2.2 Scratch . 29
8.2.3 Groove . 30
8.2.4 Relevant damage . 30
8.2.5 Non relevant damage. 30
8.3 Equipment . 30
8.3.1 General . 30
8.3.2 Cleaning cloth soft absorbent cloth material. 30
8.3.3 Calibration of the scratch-plane tester . 33
8.4 Preparation of apparatus . 36
8.4.1 General . 36
8.4.2 Scratch-plane tester . 36
8.4.3 Indexable insert (Figure 18) . 36
8.5 Preparation of test pieces . 36
8.6 Test procedure . 37
8.7 Assessment. 37
8.8 Test report . 37
9 Impact resistance . 38
9.1 Principle . 38
9.2 Apparatus . 38
9.2.1 Conditioning chamber . 38
9.2.2 Polyethylene foam . 38
9.2.3 Ball apparatus . 38
9.3 Test specimens . 41
9.4 Conditioning . 42
9.5 Procedure. 42
9.5.1 Principle . 42
9.5.2 Testing . 42
9.5.3 Factors influencing accuracy of the test . 43
9.6 Expression of results . 43
9.7 Test report . 43
Annex A (informative) Sand paper CS 17 wear resistance method . 44
A.1 Principle . 44
A.2 Test pieces . 44
A.2.1 Dimensions . 44
A.2.2 Sampling . 44
A.2.3 Conditioning . 44
A.3 Abrading system, Test equipment and materials . 44
A.3.1 Abrading plate . 44
A.3.2 Calibration plate . 45
A.3.3 Abrasive wheels . 45
A.3.4 Test machines . 45
A.3.5 Regeneration disk . 46
A.3.6 Contrast agent . 46
A.4 Procedure. 47
A.4.1 Preparation of abrasive wheels . 47
A.4.2 Calibration of abrasive wheels . 47
A.4.3 Abrasion of the specimen . 47
A.5 Result for a test piece . 47
A.5.1 Initial thickness of the coating . 47
A.5.2 Wear through . 48
A.5.3 Expression of the result for a test piece . 48
A.5.4 Expression of the result for a batch . 49
A.6 Test report . 49
Bibliography . 50

European foreword
This document (prEN 13696:2026) has been prepared by Technical Committee CEN/TC 175 “Round and
sawn timber”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 13696:2008.
The main changes compared to the previous edition are listed below:
— integration of news methods of abrasion;
— editorial update of the document.

1 Scope
This document specifies a test method to determine the resistance to wear of lacquered wood floorings,
a method to test the elasticity of the lacquer and a method to determine resistance to impact of lacquered
wood floorings.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 13756:2018, Wood flooring and parquet — Terminology
EN ISO 291:2018, Plastics — Standard atmospheres for conditioning and testing (ISO 291:2008)
EN ISO 868:2003, Plastics and ebonite — Determination of indentation hardness by means of a durometer
(Shore hardness) (ISO 868:2003)
EN ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method (ISO 6506-1)
ISO 48-6, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 6: Apparent hardness
of rubber-covered rollers by IRHD method
ISO 48-7, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 7: Apparent hardness
of rubber-covered rollers by Shore-type durometer method
3 Terms and definitions
For the purposes of this document, the following terms and definitions given in EN 13756 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1
lacquer
film making agent modifying surface layer properties
Note 1 to entry: It has a measurable thickness.
4 Common methods
4.1 Conditioning
4.1.1 Equipment
Enclosures with the following climatic conditions:
— climate temperature of (23 ± 2) °C and relative humidity of (50 ± 5) %.
4.1.2 Procedure
The manufacturer shall specify either of the conditioning climates above.
Unless otherwise specified, all equipment and materials required for the test shall be stabilised and kept
in an enclosure in the climate specified.
4.2 Measurement of the thickness of the lacquer
4.2.1 Equipment
4.2.1.1 Optical instrument
An instrument with a resolution of at least ±2 μm.
NOTE For instance, a binocular microscope with a magnification of 100 to 200 and a built-in measuring scale
in the field of view.
4.2.1.2 Contrast marking
A water-based felt tip pen.
4.2.2 Sampling
Choose the location from which the test pieces are taken, depending on the purpose of the measurement
(either in an unworn area or in a worn area).
Test pieces with a size at least 10 mm × 10 mm and by the full thickness shall be cut out of one of the wear
test pieces or area to be tested in elasticity.
The number of test pieces is specified in 5.3.3.4.1 and 6.4.1.
4.2.3 Procedure
If needed, contrast mark the lacquered face with the felt-tip pen specified in 4.2.1.2.
Clear-cut with a razor blade the edge of the lacquered face to be inspected.
Mount the test piece with the clear-cut edge facing the microscope. For each test piece, make at least two
measurements to the accuracy allowed by the resolution of the optical instrument.
Measurements of lacquer above open holes in the wood shall not be taken into account.
4.2.4 Expression of the results
When required, average the measurements made on each test piece.
If there is more than one test piece, calculate to one significant figure the mean value and the coefficient
of variation (expressed as a percentage) of the results.
5 Falling sand wear resistance method
5.1 Principle
The resistance to wear is evaluated by abrading the face of representative lacquered test pieces or
lacquered specimens with a specified abrasive sand applied by means of two loaded wheels.
The number of rotations, necessary to reach a defined wear, is used to evaluate the resistance to wear.
NOTE This test is mainly used for lacquers without antiabrasive materials like corundum.
5.2 Sampling
One floor covering element is needed. Take from this element three test pieces, measuring approximately
100 mm × 100 mm:
— two centred 10 mm in from the short edges; and
— one exactly in the centre of the element (see Figure 1).
Machined edges and machined surfaces shall be avoided in the pieces. If the thickness of the test pieces
exceeds 8 mm the specimens shall be milled down from the backside to (7,5 ± 0,5) mm to ensure a
horizontal load of the abrader arms. Make sure that specimens are uniformly flat and parallel after
milling.
If the dimension of the elements makes the described sampling impossible, the test pieces shall be
sampled from the nearest available area. If the elements measure less than 100 mm, then a joint is
necessary. The joint shall be positioned in the middle of the 100 mm × 100 mm pieces.

Figure 1 — Sampling from one floor covering element
Drill a (7,2 ± 0,1) mm centre hole into the test pieces.
5.3 Conditioning
The test pieces shall be conditioned to constant mass in one of the climates defined in 4.1.
Prior to testing, the lacquer shall be fully cured according to the manufacturer's instructions.
5.4 Apparatus testing machine
5.4.1 General
The testing machine shall consist of the items specified in 5.4.2 to 5.4.4.
5.4.2 Test piece holder
In form of a disc with a diameter of approximately 105 mm (item 4 in Figure 3) which rotates in a
horizontal plane with a permitted deviation of ±2 mm/m at a frequency of 58/min to 62/min and to
which the test specimen (item 3 in Figure 3) can be clamped with a clamping screw (item 11 in Figure 3).
5.4.3 Holding and lifting device
Holding and lifting device (item 7 in Figure 3) for the abrasive wheels, so constructed that each wheel
exerts a force of (10 ± 0,2) N on the test specimen.
A counterweight of (150 ± 3) g is required to counterbalance the mass of the leather abrading wheel
(5.4.3). A second pair of leather abrading wheels may be used for this purpose.
The calibration and maintenance of the Taber abrader arms should be carried out according to
ISO 24338:2022, Annex A.
5.4.4 Revolution-counter
A revolution counter is needed to record the number of revolutions of the specimen holder.
5.5 Grit feeder and accessories
5.5.1 General
A Grit feeder shall have a minimum storage capacity of about 200 g of grit. It shall be possible to open it
at the top and at the bottom. The bottom opening shall be positioned (10 ± 1) mm above the face of the
test piece and have a length of (16 ± 1) mm and width of (3,18 ± 0,38) mm. The length of the bottom
opening shall be installed radially to the test specimen holder. To make sure of a regular flow, a device
shall be provided in the grit feeder to ensure a regular flow. A further device ensuring an immediate stop
of the feeding is also required (see Figure 2 and Figure 3).
5.5.2 Vacuum cleaning device
A suction nozzle positioned (3 ± 2) mm above the track to be worn, shall be installed in the axial vertical
plane behind the left wheel after the abrasive grit passes under the wheel (relative to the rotation
direction; see Figure 3). The vacuum power shall remove all dust and debris but shall not influence the
flow of falling grit.
NOTE Equipment of this type, Taber Abrader and Taber Grit Feeder, are made by TABER Industries, 455 Bryant
)
Street, North Tonawanda, New York 14120 USA.

1)
This information is given for the convenience of users of this document and does not constitute an endorsement by CEN of
this product. Equivalent products may be used if they can be shown to lead to the same results.
Figure 2 — Example of a Taber abrader with grit feeder
Dimensions in millimetres
Key
1 grit nozzle 7 abrader arm
2 suction nozzle 8 counterweight
3 test piece 9 wearing surface
4 specimen holder 10 direction of rotation
5 testing weight 11 clamping screw
6 abrading wheel 12 nut
Figure 3 — Abrader with grit feeder
5.5.3 Abrading material
Electric arc furnaced Aluminium Oxide, bauxite based abrasive grain with a chemical composition
according to Table 1. The abrasive mineral has a specific gravity of 3,96 g/cm and a hardness of
21 kN/mm (Knoop). The medium grain shape of the mineral has a bulk density according to FEPA
standard 44-1 in the range of 1,51 - 1,62 g/cm . Particle size distribution ranges between 45 µm and
75 µm with a reduced fines portion according to Table 2 determined according to FEPA standard 42-1.
Table 1 — Chemical composition
Chemicals Al2O3 Fe2O3 SiO2 TiO2 CaO ZrO2 MgO
Chemical proportion % > 95 < 0,30 < 0,90 2,4 to 3,0 < 0,30 < 0,30 < 0,30
Table 2 — Grain distribution
Sieve No. 170 200 270 270 - 325 325
Grading µm 90 75 53 45
Grain distribution % 0 0 to 5 ≥ 45 ≥ 80 0 to 10

NOTE The abrading material “ALODUR ESK 240 (EN 14354)”, made by Treibacher Schleifmittel, Postfach 1, A-
2)
9523 Villach-Landskron Seebach 2, Austria, is an example of a suitable product available commercially.
The abrading material shall be used only once. Do not sieve the abrading material before use. The
abrading material shall be stored in a dry place.
5.5.4 Leather abrading wheels
Two cylindrical wheels free to turn on their axis with nominal diameter and width of respectively
44,4 mm and 12,7 mm. They are fitted with a leather strip having a width of (12,7 ± 0,1) mm and a
minimum thickness of 1,5 mm. The overall diameter of the wheels, with leather strips shall not exceed
50,8 mm or be less than 47,4 mm.
The hardness of the leather strips shall be suitable for the purpose. It is measured according to the
procedure in EN ISO 868 with a Shore-Durometer of Type A with the following deviations:
— the Shore-A hardness is measured at four points in the middle of the tire tread of abrading wheels
(instead of the requirements in EN ISO 868:2003, 5.1, 5.2 and 8.1).
— the hardness of the leather is suitable if all the results are contained within the range A/1:85 –
A/1:95.
The distance between the internal faces of the wheels shall be (52,5 ± 0,2) mm, their common axis being
set, by (19,05 ± 0,3) mm nominally, off the axis of the specimen holder. The axis of rotation of the test
piece shall be equidistant from the two wheels.
Prior to testing, new abrading wheels shall be preconditioned. Subject new wheels to an initial 2 000 cycle
test following the procedure described in 6.5.4.

2)
This information is given for the convenience of users of this document and does not constitute an endorsement by CEN of
this product. Equivalent products may be used if they can be shown to lead to the same results.
NOTE The abrading wheels “S-39”, made by TABER Industries are an example of a suitable product available
)
commercially.
5.5.5 Stopwatch
A stopwatch accurate to ±0,1 s.
5.5.6 Grit collection container
A container of known mass to collect the grit when calibrating the grit feeder.
5.5.7 Calibration plates
Calibration plates made of cell-cast acrylics with Rockwell Hardness M 94 according to ASTM D785.
NOTE The calibration plates “S38”, made by TABER Industries, are an example of a suitable product available
4)
commercially.
5.5.8 Transparent template to evaluate the wear of the abraded area
Transparent template for visual observation of wear through. Each quadrant is divided into four sectors
of 22,5° (see Figure 4).
Figure 4 — Transparent template for visual observation of wear through
5.5.9 Weighing equipment
For determining the mass loss of the calibration plate by the sand or calibrating the grit flow of the
abrading material, weighing equipment with an accuracy of ±1 mg is needed.

3)
This information is given for the convenience of users of this document and does not constitute an endorsement by CEN of
this product. Equivalent products may be used if they can be shown to lead to the same results.
4)
This information is given for the convenience of users of this document and does not constitute an endorsement by CEN of
this product. Equivalent products may be used if they can be shown to lead to the same results.
5.5.10 Contrast marking solutions
Water solution of methyl blue 0,1 % by mass fraction.
5.6 Procedure
5.6.1 General
A specified loose abrasive is fed continuously on to the face of the test piece, in the track of the loaded
wheels. As the specimen rotates the rub / wear action of the wheels and abrasive grit causes abrasion on
the test piece. After passing under both wheels, the loose abrasive is removed by a vacuum.
5.6.2 Maintenance of the abrading wheels
The abrading wheels may be used as long as the specifications described in 5.4.4 are complied with. When
they are not, the wheels shall be removed and replacement shall be carried out.
5.6.3 Operation of the abrader
To start the wear test:
— fix the test piece on the specimen holder;
— position the vacuum cleaning nozzle, start the vacuum;
— position the bottom opening of the grit feeder;
— set the revolution counter (5.4.4) to zero;
— lower the abrading wheels to the surface of the test piece;
— open the grit feeder, with the rate of grit flow calibrated as specified in 5.4.4;
— start rotation of the test piece;
— check if the sandfall is radial to the abrasion area.
To halt the wear test:
— stop rotation of the test piece;
— close the grit feeder;
— stop the vacuum;
— raise the abrading wheels;
— record the number of revolutions.
5.6.4 Calibration
5.6.4.1 Rate of grit flow
Before each test, calibrate the grit flow from the grit feeder by means of:
— the container specified in 5.5.6;
— a stopwatch as specified in 5.5.5;
— weighing equipment as specified in 5.5.9.
The grit flow shall last for (60 ± 1) s.
Collect and weigh the quantity of grit that flowed from the grit feeder. Be certain to subtract the mass of
the container from this measurement.
The grit feeder is properly calibrated if the measured mass is (21 ± 3) g.
This calibration shall be repeated after each test piece or 5 000 revolutions or each break that lasts longer
than 30 min.
5.6.4.2 Abrading capacity
For every new package of abrading material, the abrading capacity shall be checked. Start a wear test in
accordance with the procedure defined in 5.4.3, the test piece being replaced by the calibration plate
specified in 5.5.7.
Wipe clean the calibration plate with a soft cloth that has been dampened with an antistatic spray.
Measure the initial mass of the calibration plate, and then secure the calibration plate to the specimen
holder.
Operate the abrader for 2 000 revolutions. Replenish the abrading material as necessary.
Determine the difference between the initial mass of the calibration plate and the mass after
2 000 revolutions. Repeat the test two additional times with an untested side of a calibration plate (each
side of the plate may be used only one time).
Calculate the average of the three mass loss measurements.
The result is acceptable if:
— the average loss of mass is (145 ± 40) mg;
— no individual measurement is beyond the range (145 ± 50) mg.
After 25 000 revolutions, the abrading capacity shall be repeated and the result shall be checked.
After each checking of the abrading capacity calculate the calibration factor as follows:
Calibration factor = average of mass loss in g / 0,145 g.
Test equipment and materials.
5.6.4.3 Test procedure
5.6.4.3.1 Initial thickness of the lacquer
Measure it in accordance with the method specified in 4.2.
The initial thickness is required only for information. Use one test piece only.
5.6.4.3.2 Wear through
Prior to the wear test, condition the test piece as specified in 4.1.2. The wear test is carried out in the
same climate.
Run the abrader as specified in 5.5.3. until the occurrence of the wear through of the lacquer.
Evaluate wear through by placing the transparent template (see 5.5.8) on the test piece and examining
visually. If the contrast between the substrate and the lacquer is not sufficient, use the contrast making
solution specified in 5.5.10. The liquid should be spread on the surface, and removed with a dry paper in
order to colour the surface abraded and distinguish it from not completely abraded surface
Wear through has occurred when the support shows:
— through 12 sectors out of 16; and
— through 1 sector per quadrant.
Inspect the test piece after every 200 revolutions. When the test nears its end, inspect after every 100
revolutions.
Compare the examined test surface with the examples for wear trough points and deviations described
in Figure 5, examples for abrasion.

(1) Insufficient test (2) Correct test (3) Excessive test
Wear through is not reached Wear in 12 of 16 sectors and Wear-through has passed
(no abrasion in 12 sectors) in every quadrant beyond 12 sectors
Figure 5 — Assessment of Wear trough
At specimens with a joint, wear through within 10 mm of the centre joint shall be disregarded.
5.6.5 Expression of the result for a test piece
5.6.5.1 Initial thickness of the lacquer
See 4.2.4.
5.6.5.2 Single wear through value
For each specimen tested, multiply the number of total revolutions with the calibration factor determined
in 5.4.2 to obtain corrected single test values. Expression of the result for a batch.
5.6.5.3 Initial thickness of the lacquer
See 4.2.4.
5.6.5.4 Average wear through value
The result is average of the individual numbers of rotations to wear the lacquer through each test piece
(see 5.3) rounded to the previous hundred.
...