GB/T 23988-2009 PDF EnglishUS$105.00 · In stock · Download in 9 seconds
GB/T 23988-2009: Determination for abrasion resistance of coatings by falling abrasive Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 23988-2009: Determination for abrasion resistance of coatings by falling abrasive---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/GBT23988-2009GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 87.040 G 50 Determination for abrasion resistance of coatings by falling abrasive ISSUED ON: JUNE 02, 2009 IMPLEMENTED ON: FEBRUARY 01, 2010 Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Instruments and materials ... 4 4 Calibration ... 6 5 Sampling ... 7 6 Test plate ... 7 7 Operation steps ... 7 8 Result calculation ... 8 9 Test report ... 8 Bibliography ... 10 Determination for abrasion resistance of coatings by falling abrasive1 ScopeThis Standard specifies the determination method for abrasion resistance of single-layer or multi-layer coatings of paints, varnishes or related products. This test method is applicable to the determination for abrasion resistance of single- layer or multi-layer coatings of paints, varnishes or related products by dropping abrasive materials on the coating. The abrasion resistance is expressed as the amount of abrasive required to wear and tear a unit film thickness of the coating.2 Normative referencesThe terms in the following documents become the terms of this Standard by reference to this Standard. For dated references, all subsequent amendments (not including errata content) or revisions do not apply to this standard. However, parties to agreements that are based on this Standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest edition applies to this Standard. 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 9271-2008, ISO 1514:2004, MOD) GB/T 13452.2, Paints and varnishes - Determination of film thickness (GB/T 13452.2-2008, ISO 2808:2007, IDT) GB/T 20777, Paints and varnishes - Examination and preparation of samples for testing (GB/T 20777-2006, ISO 1513:1992, IDT)3 Instruments and materials3.1 Wear tester, as shown in Figure 1, with a switch near the top of the conduit to control the flow of abrasive materials. It consists of a metal disc inserted into a narrow slit on one side of the conduit with a collar covering the slit of the conduit. Firmly hold the conduit in a vertical position on the top of a suitable container. There shall be a support on the equipment for placing the painted sample at an angle of 45° to the vertical5 SamplingTake representative samples of the product under test (or each product in a multi-coating system) in accordance with GB/T 3186. Inspect and prepare test samples according to the provisions of GB/T 20777.6 Test plate6.1 Substrate Unless otherwise agreed, the substrate shall be a hard substrate in accordance with the provisions of GB/T 9271, such as metal plate or glass plate, with a minimum size of 70 mm × 150 mm. 6.2 Treatment and coating Unless otherwise agreed, each substrate shall be prepared in accordance with the provisions of GB/T 9271 and then painted using the method specified for the product or system to be tested. At least two test plates shall be prepared for each sample. 6.3 Drying and conditioning Dry and cure the coated test plate under the conditions specified for the product. Unless otherwise specified, the sample plate shall be conditioned at (23 ± 2) °C and relative humidity (50 ± 5) % for at least 24 hours before testing. 6.4 Coating thickness Measure the thickness of the dry coating by one of the methods specified in GB/T 13452.2 and express in μm.7 Operation steps7.1 Unless otherwise agreed, the tests shall be carried out at a temperature of (23 ± 2) °C and a relative humidity of (50 ± 5) %. 7.2 Mark a circular area with a diameter of approximately 25 mm on each test block and position each circular area appropriately on the abrasion test plate support. Measure the coating thickness according to the provisions in 6.4. At least 3 test points are required for each circular area. Record the average measured value of the coating thickness on each circular area. 7.3 Fix the coated test plate on the tester as described in 3.1. Adjust the test plate so that the marked circular area is just below the center of the conduit; pour a certain volume of standard sand into the funnel; turn on the switch; let the sand pass through the conduit and hit the coated test plate. The container installed at the bottom of the tester collects the fallen sand. Repeat the above operation until the coating is destroyed and the substrate of an area of 4 mm diameter is exposed. During the test, the appropriate incremental sand is 2 000 mL ± 20 mL. When approaching the end point, 200 mL ± 2 mL of sand can be added to the funnel. Note 1: When the conduit is switched on, ensure that the collar covers the narrow slit of the conduit opening. Note 2: In order to ensure that the center of the sand beam falls exactly in the center of the sand flow, check the centering of the conduit at regular intervals. Note 3: The sand shall be replaced after passing through the instrument 25 times. 7.4 Repeat the tests of 7.1 ~ 7.3 on another test plate with the same coating.8 Result calculationCalculate the abrasion resistance of the test area of the coated test plate according to the following formula: Where: A – abrasion resistance, in liters per micron (L/μm); V – volume of abrasive material used, in liters (L); T – coating thickness, in microns (μm). Take the arithmetic mean of two parallel determinations as the result, with one decimal place retained. The difference between the two parallel determinations shall be less than 25% of their average value.9 Test reportThe test report shall at least include the following: a) a reference to this Standard (GB/T 23988); b) details required to identify the product and abrasive material being tested; c) test results expressed in accordance with Clause 8; ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 23988-2009 be delivered?Answer: The full copy PDF of English version of GB/T 23988-2009 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 23988-2009_English with my colleagues?Answer: Yes. 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