This standard specifies the test method for the thickness of vacuum metal coating on the surface of soft insulating substrates. This standard is applicable to the measurement of the thickness of vacuum metal coating on the surface of soft insulating substrates. GB/T 15717-1995 Test method for thickness of vacuum metal coating Resistance method GB/T15717-1995 Standard download decompression password: www.bzxz.net
This standard specifies the test method for the thickness of vacuum metal coating on the surface of soft insulating substrates. This standard is applicable to the measurement of the thickness of vacuum metal coating on the surface of soft insulating substrates.

National Standard of the People's Republic of China
Test method for vacuum-deposited metal thickness-Electric resistance method
1 Subject content and scope of application
This standard specifies the test method for the thickness of vacuum metal coating on the surface of insulating soft substrates. This standard is applicable to the measurement of the thickness of vacuum metal coating on the surface of insulating soft substrates. 2 Referenced standards
GB2918 Standard environment for state adjustment and testing of plastic specimens 3 Test principle and equipment
3.1 Test principle
GB/T 15717 1995
The metal coating of the specimen is a section of metal conductor. The resistance value of the metal coating of the specimen of specified length and width is measured according to Ohm's law. The thickness of the metal coating is expressed as sheet resistance or its thickness is directly calculated. 3.2 Test device
DC bridge
Schematic diagram of the structure of the vacuum metal coating thickness measuring device 1--DC bridge? 2-wire, 3-measuring head? 4--measuring head connecting plate; 5-tested sample; 6 rubber sheet
Approved by the State Administration of Technical Supervision on October 18, 1995 and implemented on April 1, 1996
GB/T 15717-1995
This test uses a vacuum metal coating thickness measuring device, and the resistance measurement error is not more than 1%. Its structure is shown in the figure. The measuring width of the device is not less than 100mm, and the distance accuracy between the two measuring heads is ±0.10mm. 4 Specimens and preparation
4.1 Specimen size: length is not less than 300mm, width is 100 ±0.10mm. The number of specimens is not less than five. 4.2 The surface of the specimen should be smooth and flat, without defects such as creases, dirt, spatter points, scratches, etc. Note: When the width of the sample is narrower than 100mm, the actual size shall be used as the width of the sample. 5 Test steps
Place the metal coating measuring instrument and the sample in the environment of 23±2℃, 45%-55%RH specified in GB2918, and measure after 4 hours. 5.1
Wipe the measuring head of the instrument with anhydrous ethanol before each measurement. Place the sample flat on the rubber plate of the measuring instrument to ensure good contact between the measuring head and the metal coating. 5.3
5.4 The instrument must be zeroed before each measurement.
5.5 Measure the resistance value of the sample.
6 Calculation and expression of test results
6.1 Sheet resistance of metal coating
Where: Q/□---Square resistance 0;
R---Resistance value of the metal coating to be measured, a; I————Ratio of effective length to width of the sample Take the average value of 5 test results and retain three significant figures. 6.2 Thickness of metal coating
Where: d-thickness of metal coating, mm,
resistivity, 10-3Q·mm2/mm;
Q/square resistance, 2.
Take the average value of 5 test results and retain three significant figures. 6.3 Average degree of metal coating
8= 0/max -
0/n×100bZxz.net
~average degree of metal coating, %;
Where: —
0/mx—maximum square resistance value, 0#
/min——minimum square resistance value, 2,
2/—average square resistance value, a.
The test results are retained to two significant figures.
Note: (1) The thickness of vacuum metal coating can be expressed by thickness value or square resistance value. ② The unit of resistivity is converted from Q·mm\/m to 10-30·mm/mm. 7 Test report
The test report shall include the following contents:
(2)
(3)
Product standard name and code:
Sample name, specification, model, grade; GB/T 15717-1995
Square resistance, thickness and uniformity of metal coating; test environment;
Test personnel and date;
Other matters that need to be explained, etc.
Additional notes:
This standard was proposed by China National Packaging Corporation. This standard is under the jurisdiction of the National Packaging Standardization Technical Committee. This standard was drafted by the National Packaging Product Quality Supervision and Inspection Center (Jinan) and Qingzhou Aluminum Foil Paper Factory. The main drafters of this standard are Yuan Huachuan, Wang Xingdong, Liu Faguo, Yu Yusheng and Xu Lianshui. 397
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