GB/T 39815-2021 English PDF

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GB/T 39815-2021: Test method for scratch resistance of ultrathin glass
Status: Valid

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Basic data

Standard ID: GB/T 39815-2021 (GB/T39815-2021)
Description (Translated English): Test method for scratch resistance of ultrathin glass
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Q30
Word Count Estimation: 10,146
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 39815-2021: Test method for scratch resistance of ultrathin glass

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Test method for scratch resistance of ultrathin glass ICS 81.040.01 Q30 National Standards of People's Republic of China Test method for scratch resistance of ultra-thin glass Released on 2021-03-09 2021-10-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee Test method for scratch resistance of ultra-thin glass

1 Scope

This standard specifies the terms and definitions, test principles, test equipment, samples, tests, and calculation of results for the scratch resistance test of ultra-thin glass And test report. This standard applies to the scratch resistance test of ultra-thin glass with a thickness of 0.1mm~1.1mm, and the scratch resistance test of glass of other thicknesses can be tested. Refer to the implementation of this standard.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document. JJG112 Metal Rockwell Hardness Tester

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Furrowscratch Visible V-shaped damage marks formed on the surface of the sample. 3.2 Criticalload The normal load applied when plow-shaped scratches with continuous length greater than 3mm begin to appear on the surface of the sample. 3.3 Scratch resistance The ability of the surface of the sample to resist being scratched by hard objects is expressed by the critical load value. 3.4 Constantloading The load acts on the measured object at a constant value. 3.5 Continuousloading The load starts from a certain initial value and is applied to the object under test in a continuous increment manner.

4 Test principle

Use a certain size of the indenter to act vertically on the surface of the sample, and use a constant loading or continuous loading method to make the indenter water along the surface of the sample. Move horizontally until a plough-shaped scratch that meets the specified requirements appears on the surface of the sample. At this time, the normal force applied by the indenter on the surface of the sample is the test. Such anti-scratch performance indicators.

5 Test equipment

The test equipment is a scratch tester, which is composed of a lifting device, a moving system, a pressure sensor, a sample table, an indenter, a camera system, etc., as shown in Figure 1. As shown, the scratch tester should be able to achieve constant loading and continuous loading, and should meet the following requirements. a) The lifting device is used to adjust the pressure head and pressure sensor up and down, the adjustment range is 0mm~80mm, and the adjustment speed is 1mm/min~ 30mm/min; b) The moving system drives the slider to move horizontally through a servo stepper motor, the stroke range is not less than 300mm, and the moving speed range is 30mm/min~180mm/min; c) The measuring range of the pressure sensor is 0N~50N, and the resolution should reach 0.01N; d) The sample table should be a stainless steel rigid platform with a thickness of not less than 5mm, and the surface should be smooth and flat, and the sample can be fixed; e) The indenter should adopt the Rockwell diamond indenter of HRC-3 specification, the cone angle is (120±0.35)°, and the structure diagram of the indenter is shown in Figure 2. Show. The technical indicators and verification of Rockwell diamond indenter should meet the requirements of JJG112; f) The camera system consists of a camera and an image recorder, the camera magnification is 10 to 20 times, and the built-in accuracy is 0.1mm Scale. During the test, the camera should be able to move synchronously along the marking direction of the indenter.

6 Sample

The ultra-thin glass material of the same material, the same process, the same thickness and no appearance and internal quality defects should be used, and the size should be not small. For rectangular specimens of 75mm×150mm, edge grinding is not required, but there should be no visible cracks and chippings above 1mm on the edges. The number of samples is not Less than 10 pieces, the number of samples includes the samples that caused the test results to be invalid during the test.

7 Test

7.1 Test environment The test should be carried out at room temperature and relative humidity (50±20)%. 7.2 Sample handling Before the test, use a soft cloth and cleaning agent to remove the dust, oil and other impurities on the surface of the sample that may affect the test result, and rinse with distilled water Wash it and place it for at least 4h under the environmental conditions specified in 7.1.Do not damage the surface of the sample during sample handling. 7.3 Test procedure 7.3.1 Constant loading method The test should be carried out according to the following steps. a) Turn on and check the instrument; b) Adjust the sample stage to a horizontal state; c) Set equipment parameters. moving system speed (60.0±1.0) mm/min; d) Place the sample on the sample table and in close contact with it, the sample should be properly fixed, and the sample should not be between the sample table and the sample table during the test. Relative slip should occur; e) Adjust the position of the indenter of the scratcher so that the angle between the axis of the indenter and the plane of the sample table is (90±2)°; f) Adjust the lifting device, set the initial pressure value of the indenter, such as 5N, turn on the moving system, and the indenter will continuously move on the glass surface to form (100.0±5.0)mm scratches, and the scratch line should be parallel to the long side of the sample. Use the camera system to observe whether the surface of the sample is There are plough-shaped scratches with a continuous length greater than or equal to 3mm; g) If there is no plough-shaped scratch with a continuous length greater than or equal to 3mm in the test according to 7.3.1f), you can submit it according to the needs of the test. Increase the force, such as increasing 0.5N or 1N, continue to test according to 7.3.1f) steps, until the continuous length is greater than or etc. Plow-shaped scratches of 3mm. During the test, all the scratch lines should be parallel to each other, and the interval b should not be less than 5mm. The layout diagram is shown in Figure 3, and the scratch line should not be less than 10mm from the edge of the sample; h) If a plough-shaped scratch with a continuous length greater than or equal to 3mm is found in the test according to step 7.3.1f), it can be reduced according to the needs of the test. Use force, such as decrement 0.5N or 1.0N, continue to test according to 7.3.1f), until there is no continuous length greater than or equal to 3mm plow-like scratches. Note 1.Select the indenter force corresponding to the length of the continuous plough scratches closest to 3.0mm as the critical load value of the scratch resistance of the sample. Note 2.If the plough-shaped scratches that meet the conditions are not obtained on the surface of the sample, the test of the sample will fail and be invalid, and another sample will be taken to restart the test, and at the same time according to For the test results of the upper sample, increase or decrease the initial pressure value of the indenter as appropriate. Note 3.If the sample is cracked or broken in the middle, the test of the sample fails and becomes invalid. 7.3.2 Continuous loading method The test should be carried out according to the following steps. a) Adjust the instrument and fix the sample according to the steps in 7.3.1a) to e); b) Adjust the lifting device so that the initial pressure value of the indenter is (0.2±0.1) N, turn on the moving system, and the indenter continuously moves on the surface of the sample. The scratch line is parallel to the long side of the sample, and the pressure loading rate is 12.0N/min~24.0N/min, preferably 18.0N/min, moving The system speed is (60.0±1.0)mm/min, and it stops moving when the length of the plow-shaped scratch exceeds 4mm. Test 5 times in a row, each time The scratch lines are parallel and the spacing is not less than 5mm, and the distance between the scratch lines and the edge of the sample should not be less than 10mm; c) According to the video of the indenter and the scratch on the glass surface recorded by the camera system, read the measurement when the scratch length is (3.0±0.5) mm The test pressure value is used as the test result, and the arithmetic average of the 5 test results is taken as the critical load of the scratch resistance of the sample. Charge value.

8 Result calculation

The test results should be calculated as follows. a) Critical load. According to the test requirements in Chapter 7, 5 glass samples are used for testing, and the scratch resistance of 5 samples is calculated according to formula (1). The arithmetic mean P of the load value, and as the critical load of the batch of samples.

9 Test report

The test report should include at least the following. a) Entrusted unit and inspection category; b) Test basis and instruments used; c) Sample name and description; d) Test temperature and humidity; e) Test loading method and test procedure; f) Test results, including the critical load value of each specimen, the arithmetic mean value and standard deviation of the critical load; g) Standards used (including release and publication year number); h) Inspector, reviewer, date; i) Other relevant information. ......

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