This standard specifies the test method for the resistivity of fiber-reinforced plastics that have conductive and antistatic properties by adding conductive particles or antistatic agents. This standard is applicable to materials with resistivity less than 108Ωcm, and is not applicable to materials that have conductive and antistatic properties by changing their surface resistance. GB/T 15738-1995 Test method for resistivity of conductive and antistatic fiber-reinforced plastics GB/T15738-1995 Standard download decompression password: www.bzxz.net

1s 83.120
National Standard of the People's Republic of China
G8/T15738--1996
Conductive and antistatic fiber reinforced plastics
Test method of resistivity
Test method of resistivity for fibre reinforcedconducting and antistatic plastics1995-11-16Published
National Technical Supervision Bureau
Implementation on 1996-06-01
National Standard of the People's Republic of China
Conductive and antistatic fiber reinforced plastics! bzxZ.net
Test method for resistivity
Test tnethnd nf Tealstivity fnr flbre relafnrcedconductlig and ntistnic plastlcs1 Subject content and applicable scope
GB/T15738—1995
This standard specifies the test method for resistivity of fiber reinforced plastics with conductive and antistatic properties by internally adding conductive micro- or antistatic agents.
This standard is applicable to the measurement of materials with resistivity less than 10m + materials with conductive and antistatic properties due to the change of surface resistance.
2 Reference standards
CB1446 General test method for fiber reinforced materials 3 Principle
This standard adopts the principle of four-terminal test method. When used as a reference, the sample specified in the angle must be selected to achieve the electrode structure. When a wider long test specimen is used, a wider electrode is used accordingly. A stable direct current of magnitude 1 is passed between the power supply electrodes at both ends of the test specimen, and the voltage drop (V) between the two potential electrodes is measured electrostatically. The test resistance between the two potential electrodes is R=F/F, and it is concluded that it has nothing to do with the ground resistance. 4. Storage and measurement equipment
Schematic diagram of the test circuit is shown in the National Technical Supervision Requirement 1995-11-16 Approved 1996-06-01 GB/T15738-1995
Figure 1 Schematic diagram of the test circuit
1-Sample battery
All components are insulated against a 102-millimeter power supply voltage: 3 km-key resistance
4.1 Power supply: Select the power supply directly and place the power supply on a commercially available insulated equalizer so that its resistance to ground is not less than 10\4. And the power consumption caused on the sample is not more than 0.1A,
4.2 mA meter or microammeter: choose one of them, the current measurement should be accurate to ±5%. When the current is less than 0.1A, the voltage drop across the known self-resistance R of the sample can be measured by the electrometer, and the voltage drop can be calculated by the electric filter formula (1). IALR
where: · Current through the sample A
The voltage drop between the potential electrodes, V
is equal to the resistance value of 0.0.
4.3 Phone
4.3.1 Power supply electrode, made of pure brass or stainless steel. The length is not less than the width of the sample, and the contact width with the sample is about 5m yuan 1.4.3.2 Potential electrode: Its mass is about 606, and the force applied to the sample is about 0N. The distance between the two contacts should be 10 ± 0.2 mm (see Figure 2). If there are special requirements, the distance between the contacts can reach 70 mm. However, the distance should be at least 6 mm smaller than the length of the sample. The accuracy of the distance between the two contacts is 2%. The continuous resistance of the contact must not be less than 10\A. GE/r15738-1995 Figure 2 Electrostatic discharge 1. Continuous resistance (car, sample or stainless steel) 4.4 Electrometer, input resistance is greater than 10:0, measurement accuracy is = 5% 4.5 High insulation material two plates: volume resistivity greater than 10\0 cm: 4.6 Machine temperature box: temperature control at 70-+2℃. 5 Sample 51 Sample size Sample width, 10 ± 02 mm length, 70 ~150mm thickness, 1~4mm, average curvature, =5%. Reference thickness: 3~4m, 5-2 Sample preparation
When cutting the sample, deformation and damage should be avoided. The test surface should be very clean. If necessary, it can be washed with a mixture of silicate water, rinsed with distilled water, and dried. The surface of the sample cannot be polished or polished, nor can it be rubbed with organic substances that corrode or swell the sample material. 5.3 Number of samples
The number of samples is 3. Considering the influence of anisotropy, 3 samples should be cut from two mutually perpendicular directions. The direction should be parallel and perpendicular to the fiber direction or the flow direction during processing. 6 Test environment conditions
Ambient temperature: 23±2℃. Relative humidity: 45%~55%:? Test steps
7.1 Use measuring tools to measure the length, width and thickness. The thickness of the sample should be evaluated. The length should be measured at 6 evenly distributed points, and the average value should be obtained. The error of each measured value should not be greater than 5% of the average value. 7.2 Place the sample on a high-pressure material plate and test it at the ambient temperature specified in CB1446 for at least 16 hours. 7.3 Before the test, connect the power supply electrodes to both sides of the sample. 7.4 Put the above potential electrode system into a constant temperature box: heat it at 71 ± 2 °C for 2 hours, and then heat it to room temperature for more than 1 hour. For materials that are prone to deformation at 70 °C, they can be heated at 60 ± 2 °C for 3 hours. After taking it out, place it under the temperature for more than 1 hour. 7.5 Place the potential electrode system on the sample, ensure that the blade contact is at right angles to the direction of the electric field, and the distance between the potential electrode at any end and the power supply electrode should be greater than 20mm, apply direct current to the power supply electrode, read the current after charging for 60 seconds <1. And use an electrometer to measure the voltage drop between the potential electrodes (V). GB/T15738-1995 Move the potential electrode slowly and measure the same test ladder twice to obtain the voltage drop on the sample evenly distributed between the power supply electrodes (7.6 Carry out the same measurement on other samples. Calculation of test results B.1 The resistance value R of each bit of the potential electrode is calculated according to formula (2): R - voltage drop between the potential electrodes, V. I - current passing through the sample, A (when the current is less than 0.1 bar A, calculate according to formula (1)). 8.2 The resistivity P is calculated according to formula (3) where r is the resistivity, cm2. R is the resistance value calculated in 8.1, a is the cross-sectional area of ​​the specimen perpendicular to the direction of current flow, cm2 (see Figure 3); the distance between the two potential electrodes is em2. The median value is taken from the test results as the resistivity value of the test material: B-3 The arithmetic mean value of the test results x standard deviation 3, number of deviations Cy. According to GB1446 Chapter 6 calculation, 1-power supply electrode: 2-cross-sectional (5) 9 test report The test report should include the following items: Material name, production unit, sample collection direction: Sample size Sample handling method: Distance between power supply electrodes, GE/T15738-1995 Single value, median, arithmetic mean value of resistivity, standard deviation and dispersion coefficient; Others Additional remarks: This standard was proposed by China Ordnance Industry Corporation and the standard was approved by the National Fiber Reinforced Plastics Standardization Technical Committee. This standard was drafted by the 53rd Institute of China Ordnance Industry, and the main drafters of this standard were Zhu Jinyi and Li Changzheng. This standard refers to the international standard S03915-1981 Determination of resistivity of conductive plastics 3.
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