This standard specifies the test principle, test instrument and test method for the volume resistivity of conductive and antistatic plastics. This standard is applicable to plastics with a volume resistivity less than 106Ω·m. GB/T 15662-1995 Test method for volume resistivity of conductive and antistatic plastics GB/T15662-1995 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Conductive and antistatic plastic volume resistivity
Testing method
Method of testing volume resistivityof conducing and antistatic plastics This standard adopts 1SO39151981 "Testing method for volume resistivity of conductive plastics". Subject content and scope of application
GB/T15662-1995
This standard specifies the testing principle, testing instrument and testing method for volume resistivity of conductive and antistatic plastics. This standard is applicable to plastics with a volume resistivity of less than 10°a·m. 2 Testing principle
The volume resistance is calculated by measuring the stable DC current (I) flowing through the sample and the voltage (V) between the corresponding voltage electrode edges on the sample. 3 Testing instrument
3.1 Power supply
Use a DC regulated power supply with an output voltage fluctuation coefficient of no more than 0.2%, an output voltage of 0~1000V, and an insulation resistance to ground greater than 102α.
3.2 Ammeter
Use a DC ammeter with a precision of Class 1 and a range of 10-8 to 10-1A. 3.3 Electrostatic voltmeter
Use an electrostatic voltmeter with a precision of Class 1, a range of 0 to 100V, and an input impedance greater than 10122. 3.4 Current electrode As shown in Figure 1, it consists of an electrode plate, an insulating plate, a clamping nut, and a bolt. Approved by the State Administration of Technical Supervision on August 7, 1995 574
Implemented on April 1, 1996
3.4.1 Electrode plate
GB/T15662—1995
1--Bolt: 2 Clamping nut; 3: Insulating plate; 4--Test sample; 5--Electrode plate Figure 1 Current electrode
The electrode plate is made of brass. Its size is 70mm×14mm×3mm, and the surface is chrome-plated. 3.4.2 Insulation board
The insulation board is made of insulating material with a resistivity greater than 10122·m. The recommended dimensions are: length 84~150mm, width 70mm, thickness 14mm.
3.4.3 Clamping bolts and nuts
Made of brass M5×25 bolts and M5 nuts. 3.5 Voltage electrode
The voltage electrode is shown in Figure 2. It consists of a main electrode, an insulating plate, and a terminal. Its weight is 608. The two edges of the electrode should be kept parallel, and the insulation resistance between the two edges should not be less than 10122.575
3.6 Constant temperature drying oven
GB/T15662--1995
1 Main electrode 2-Insulating plate; 3-Terminal
Figure 2 Voltage electrode
Use a constant temperature drying oven with a temperature control range of 25-100℃ and a temperature measurement error of ±2℃. 4 Specimens
4.1 Use a knife or a punch to cut three specimens in both the vertical and horizontal directions on the test piece. The specimen is 70-150mm long, 10mm wide, and 3-4mm thick. The thickness deviation of each point of the same specimen should not be greater than ±0.2mm. 4.2 The surface of the sample must be smooth, clean, free of cracks, bubbles, impurities and other defects. 4.3 The sample must not be stretched or bent, and its surface must not be polished or ground. 5 Test standard environment
23±2'℃
Relative temperature 50%±5%
6 Test steps
6.1 Scrub the cut sample with diatomaceous earth and water, then wash and dry with distilled water. Do not use organic solvents for cleaning. 6.2 Clamp the two ends of the sample treated in 6.1 between the electrode plates at both ends of the current electrode. 6.3 Place the current electrode with the sample in a constant temperature box and keep it at a constant temperature of 70±2℃ for 2h. 6.4 Take out the current electrode with the sample treated in 6.3, place it under the test standard environment conditions for 2h, and then test it. 6.5 Connect the test circuit according to Figure 3, place the voltage electrode on the sample, and make its cutting edge contact perpendicular to the direction of the current flowing through the sample, but the distance between the cutting edge of the voltage electrode and the electrode plate shall not be less than 20mm. Connect the power supply, and read the current and voltage values ​​on the ammeter and electrostatic voltmeter respectively after 1 minute. However, the power consumption in the sample shall not exceed 0.1W. GB/T 15662--1995
1--Insulation board; 2--Insulation board; 3-Sample; 4-Clamping nut; 5-Bolt; 6-Electrode plate; 7--Voltage electrode Figure 3 Schematic diagram of test circuit
6.6 Test three times according to step 6.5 at different positions in the length direction of each sample. 6.7 Test another 5 samples in the same way. 7 Test resultsbZxz.net
7.1 Calculate the resistance value at three different positions of the sample according to the following formula. Take the arithmetic mean as the resistance value of the sample. R=U/
Where: R--resistance value,;
U-voltage between the two edges of the voltage electrode, V; I-current flowing through the sample, A.
7.2 Calculate the volume resistivity according to the following formula:
pR·S/LR·bd/L
Where: —
Volume resistivity, α·m;
Sm-the cross-sectional area of ​​the sample perpendicular to the current, m\; b——the width of the sample, m;
d-the thickness of the sample, m;
L-the distance between the two edges of the voltage electrode, m. 7.3 The resistance value and volume resistivity are calculated to two significant figures. 7.4 The average resistivity of the six samples is taken as the test result. Additional remarks:
This standard is proposed by the Ministry of Public Security of the People's Republic of China. This standard is under the jurisdiction of the National Fire Protection Standardization Technical Committee. This standard is drafted by the Shenyang Fire Science Research Institute of the Ministry of Public Security. (1)
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