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GB/T 1768-2006: Paints and varnishes -- Determination of resistance to abrasion -- Rotating abrasive rubber wheel method Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 1768: Historical versions
GB/T 1768-2006: Paints and varnishes -- Determination of resistance to abrasion -- Rotating abrasive rubber wheel method---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT1768-2006 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 ContentsForeword ... 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 method1 ScopeThis 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 referencesThe 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 PrinciplesUnder 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 requiredFor 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 Instruments5.1 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 SamplingAccording 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 panels7.1 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 Steps8.1 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 expression9.1 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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