GB/T 1768-2006 PDF English
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Paints and varnishes -- Determination of resistance to abrasion -- Rotating abrasive rubber wheel method
| Valid |
| GB/T 1768-1979 | English | RFQ |
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Method of test for abrasion resistance of paint films
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GB/T 1768-2006: Paints and varnishes -- Determination of resistance to abrasion -- Rotating abrasive rubber wheel method
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 87.040
G 51
GB/T 1768-2006 / ISO 7784-2:1997
Replacing GB/T 1768-1979 (1989)
Paints and varnishes - Determination of resistance to
abrasion - Rotating abrasive rubber wheel method
(ISO 7784-2:1997, Paints and varnishes - Determination of resistance to abrasion -
Part 2: Rotating abrasive rubber wheel method, IDT)
ISSUED ON: DECEMBER 29, 2006
IMPLEMENTED ON: JUNE 01, 2007
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
National Standardization Administration.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Principles ... 6
4 Supplementary information required ... 7
5 Instruments ... 7
6 Sampling ... 9
7 Test panels ... 9
8 Steps ... 10
9 Result expression ... 11
10 Precision ... 12
11 Test report ... 12
Appendix A (Normative) Supplementary information required ... 13
Appendix B (Informative) Calibration of instruments ... 14
Appendix C (Informative) Precision ... 16
References ... 17
Paints and varnishes - Determination of resistance to
abrasion - Rotating abrasive rubber wheel method
1 Scope
This standard is one of a series of standards related to sampling and testing of paints,
varnishes and related products.
This standard specifies a test method for the determination of the abrasion resistance of
dry films of paints, varnishes or related products, using a rubber grinding wheel,
through rubbing with the rotating motion of the rubber grinding wheel.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For the dated references, the subsequent amendments
(excluding corrections) or revisions do not apply to this Standard; however, parties who
reach an agreement based on this Standard are encouraged to study if the latest versions
of these documents are applicable. For undated references, the latest edition of the
referenced document applies.
GB/T 3186 Paints, varnishes and raw materials for paints and varnishes - Sampling
(GB/T 3186-2006, ISO 15528:2000, IDT)
GB/T 9271 Paints and varnishes - Standard panels for testing (GB/T 9271-1988, eqv
ISO 1514:1984)
GB/T 13452.2 Paints and varnishes - Determination of film thickness (GB/T
13452.2-1992, eqv ISO 2808:1974)
GB/T 20777 Paints and varnishes - Examination and preparation of samples for
testing (GB/T 20777-2006, ISO 1513:1992, IDT)
3 Principles
Under specified conditions, use a rubber grinding wheel fixed on the abrasion tester to
rub the dry paint film of paint or varnish. During the test, a weight of specified weight
must be added to the rubber grinding wheel. Wear resistance is expressed by the mass
loss of the paint film, after a specified number of friction cycles, OR by the number of
cycles required to remove this course of coating to the next course of coating or
substrate.
4 Supplementary information required
For any particular application, the test methods specified in this standard need to be
completed with supplementary information. The terms of the supplementary
information are set out in Appendix A.
5 Instruments
5.1 Abrasion tester, consisting of the components described in 5.1.1 to 5.1.4 (see Figure
1).
5.1.1 The turntable, which can rotate at a speed of (60 ± 2) r/min; the test panel can be
centered on the turntable and firmly fixed.
5.1.2 Two rubber grinding wheels1), each rubber grinding wheel is (12.7± 0.1) mm thick.
Install the two rubber grinding wheels on the horizontal rotating shaft, respectively;
they can rotate freely around the rotating shaft. The distance between the inner surfaces
of the two rubber grinding wheels is (53.0 ± 0.5) mm. The assumed distance -- between
the axis passing through the two rotating shafts and the central axis of the turntable --
is (19.1 ± 0.1) mm. The outer diameter of the new rubber grinding wheel is (51.6 ± 0.1)
mm. The outer diameter of the rubber grinding wheel shall not be less than 44.4 mm,
under any circumstances.
The selection of rubber grinding wheel model shall be agreed upon by the parties
concerned.
Since the rubber bonding material of the rubber grinding wheel gradually hardens, its
hardness shall be checked to see if it meets the technical requirements specified by the
manufacturer. The rubber grinding wheel may no longer be used if the manufacturer's
expiration date marked on the rubber grinding wheel has passed, OR if more than one
year has passed since the date of purchase, if no expiration date was given.
1 According to the wear and tear of the paint product during use, select three types of rubber grinding wheels from
Taber Industries in the United States: CS-10F, CS-10, CS-17, or rubber grinding wheels with agreed abrasion effects
equivalent to them.
1.5 kPa2) ~ 1.6 kPa lower than the atmospheric pressure.
5.2 Weight, which can gradually increase the load on each rubber grinding wheel, up to
a maximum of 1 kg.
5.3 Reconditioning media, in the form of friction discs, is used to recondition rubber
grinding wheels.
Note: Different reconditioning media shall be selected according to different rubber grinding
wheels.
5.4 Calibration plate, which has a thickness of (0.8 ~ 1) mm, is used for instrument
calibration (see Appendix B).
5.5 Balance, accurate to 0.1 mg.
6 Sampling
According to the provisions of GB/T 3186, take a representative sample of the product
under test (or each product in a multi-coating system).
Inspect and prepare test samples, according to the provisions of GB/T 20777.
7 Test panels
7.1 Substrate
Unless otherwise agreed, the substrate shall be selected in accordance with the
provisions of GB/T 9271. If possible, the same type of material as that used in actual
use shall be selected. The substrate of the test panel shall be flat and without
deformation; otherwise, the abrasion of the coating under test will be uneven.
7.2 Shape and dimensions
The shape and size of the test panel shall enable the test panel to be correctly fixed on
the instrument. There shall be a hole with a diameter of 6.35 mm in the center of the
test panel.
Note: The commonly used test panel size is 100 mm × 100 mm or φ100 mm.
7.3 Treatment and painting
Unless otherwise agreed, each test panel shall be treated according to the provisions of
GB/T 9271. Then the tested product or product system shall be painted according to the
2 1 kpa - 10 mbar.
prescribed method.
7.4 Drying and conditioning
Each painted test panel is dried (or baked) under specified conditions and left, if
applicable, for a specified period of time.
7.5 Thickness of coating
Determine the dry film thickness according to a method specified in GB/T 13452.2,
expressed in μm.
8 Steps
8.1 Test conditions
Unless otherwise agreed, tests are carried out under the conditions of temperature (23
± 2) and relative humidity (50 ± 5)%.
8.2 Calibration of instrument
Calibrate the instrument (an example of the calibration procedure is given in Appendix
B).
8.3 Preparation of rubber grinding wheel
8.3.1 Check whether the rubber grinding wheel meets the requirements specified in
5.1.2.
8.3.2 To ensure that the abrasive effect of the rubber grinding wheel is maintained at a
constant level, prepare the rubber grinding wheel in accordance with the manufacturer's
specifications and in accordance with 8.3.2.1 to 8.3.2.4.
8.3.2.1 Install the selected rubber grinding wheels onto their respective flange frames,
being careful not to touch the friction surface directly with your hands. Adjust the load
on the rubber grinding wheel to a value agreed upon by the parties concerned.
Note: The load on the rubber grinding wheel is expressed by the marked mass of the weight
(the sum of the mass of the pressurizing arm and the mass of the weight itself).
8.3.2.2 Install the reconditioning media disc onto the turntable. Carefully lower the
friction head, so that the rubber grinding wheel rests on the disc. Place the vacuum
nozzle and adjust the position of the vacuum nozzle, so that it is about 1 mm away from
the surface of the disc.
8.3.2.3 Set counter to zero.
8.3.2.4 Turn on the vacuum cleaner and start the turntable. Run the rubber grinding
wheel on the reconditioning media disc for the specified number of revolutions, to
recondition the rubber grinding wheel.
Note: The commonly used number of revolutions is 50 revolutions.
Before testing each specimen and after every 500 revolutions, the rubber grinding wheel
is reconditioned, in such a way that the friction surface is exactly cylindrical and the
edges between the friction surface and the side surfaces are sharp without any bending
radii. Recondition new rubber grinding wheels before first use.
8.4 Determination
8.4.1 Unless otherwise agreed, condition the painted test panels for at least 16 hours at
temperature (23 ± 2) and relative humidity (50 ± 5)%.
8.4.2 If the coating surface is irregular due to dry skin, brush marks, etc., pre-grind it
for 50 revolutions before testing. Then wipe it clean with lint-free paper. If this
operation is performed, it shall be noted in the test report.
8.4.3 Weigh the conditioned test panel or the test panel that has been pre-ground and
wiped clean with lint-free paper to the nearest 0.1 mg. Record this mass.
8.4.4 Fix the test panel on the turntable. Place the friction head on the test panel. Put
the vacuum nozzle in place.
8.4.5 Set the counter to zero. Switch on the vacuum cleaner. Start the turntable.
8.4.6 After the specified number of revolutions, use lint-free paper to remove any loose
grinding debris remaining on the test panel. Weigh the test panel again and record this
mass. Check the test panels to see if the coating has been worn through.
8.4.7 Measure the wear point more accurately by interrupting the test at certain intervals;
calculate the average mass loss after a specified number of friction cycles.
8.4.8 Repeat steps 8.4.2 to 8.4.6 on the other two test panels; record the results.
9 Result expression
9.1 For each test panel, use the decrement method to calculate the mass loss after the
agreed number of revolutions.
Calculate the average mass loss for all three test panels; report the results to the nearest
1 mg.
Note: Mass loss can also be calculated for each interval in which the test is interrupted.
Appendix B
(Informative)
Calibration of instruments
B.1 General
Auxiliary facilities required for calibration, such as calibration plates and sandpaper,
are best obtained from the abrasion meter manufacturer. Usually, manufacturers use
zinc plates as calibration plates.
B.2 Instruments
In addition to complying with the provisions of Chapter 5, the instrument shall also
include the following facilities.
B.2.1 Two rubber wheels
Each rubber wheel is (12.7 ± 0.1) mm thick, which has a total diameter of (50.0 ± 0.2)
mm (including the outer rubber strip). The outer circumference of the wheel is covered
with a rubber strip which has a thickness of 6 mm and a hardness of (50 ± 5) IRHD
(measured according to GB/T 6031-1998). The rubber wheel is installed on the
horizontal axis and can rotate freely around the axis.
The distance between the inner surfaces of the two rubber wheels is (53.0 ± 0.5) mm.
The assumed distance between the axis passing through the two rotating shafts and the
central axis of the turntable is (19.1 ± 0.1) mm. The mass distribution of the device shall
be such that the force exerted by each rubber wheel on the test panel is (1 ± 0.02) N.
B.2.2 Sandpaper strips
It has a width of (12 ± 0.2) mm and a length about 175 mm. The grade of sandpaper
shall comply with the abrasive grain size standard P180 in the P series of GB/T 9258.2-
2000.
Note: Self-adhesive sandpaper is also available from some manufacturers.
B.2.3 Double-sided tape
If it cannot buy self-adhesive sandpaper, it can use a double-sided tape strip, which has
a width of (12 ± 0.2) mm and a length of about 175 mm.
B.3 Calibration steps
B.3.1 Unless otherwise agreed, condition the sandpaper, tape (if used), test panels at
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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