7. Ozone resistance test
The length of the sample is 20cm, and it is placed in a drying vessel for 16h. The diameter of the test rod used in the bending test is (2±0.1) times the outer diameter of the cable. Test box: temperature (40±2)℃, relative humidity (55±5)%, ozone concentration (200±50)×10-6% , Air flow: 0.2 to 0.5 times the volume of the test chamber/min. The sample is placed in the test box for 72h. After the test, there should be no visible cracks on the surface of the sheath.
8. Weather resistance/UV test
Each cycle: sprinkle water for 18min, xenon lamp drying for 102min, temperature (65±3)℃, relative humidity 65%, minimum power under the condition of wavelength 300～400nm: (60±2)W/m2. After 720h, the bending test at room temperature was carried out. The diameter of the test rod is 4 to 5 times the outer diameter of the cable, and there should be no visible cracks on the surface of the sheath after the test.
9. Dynamic Penetration Test
Under room temperature, the cutting speed is 1N/s, and the number of cutting tests: 4 times. Each time the test sample is continued, the sample must be moved forward by 25mm and rotated 90° clockwise. Record the penetration force F at the moment of contact between the spring steel needle and the copper wire, the average value obtained is ≥150·Dn1/2 N (4mm2 section Dn=2.5mm)
10. Dent resistance
Take 3 sections of samples, each section is 25mm apart, and make a total of 4 dents at 90° rotated, the dent depth is 0.05mm and is perpendicular to the copper wire. The 3-stage samples were placed in the -15°C, room temperature, and +85°C test chambers for 3 hours, and then wound on the mandrel in the respective test chambers. The diameter of the mandrel was (3±0.3) times the minimum outer diameter of the cable. At least one notch per sample is located on the outside. Conduct AC0.3kV water immersion voltage test without breakdown.
11. Sheath heat shrinkage test (11 in GB/T 2951.13-2008)
The sample was cut with a length of L1=300mm, placed in a 120°C oven for 1 hour, then taken out to room temperature for cooling, repeated 5 times of such cooling and heating cycles, and finally cooled to room temperature. The thermal shrinkage rate of the sample is required to be ≤2%.
12. Vertical burning test
After the finished cable is placed at (60±2) ℃ for 4h, the vertical burning test specified in GB/T 18380.12-2008 shall be carried out.
13. Halogen content test
pH and conductivity
Sample placement: 16h, temperature (21～25)℃, humidity (45～55)%. Two samples, each of (1000±5) mg, were crushed into particles of less than 0.1 mg. Air flow (0.0157·D2)l·h-1±10%, the distance between the combustion boat and the edge of the effective heating area of ​​the furnace is ≥300mm, the temperature at the combustion boat must be ≥935℃, 300m away from the combustion boat (in the direction of air flow) ) temperature must be ≥900℃.
The gas generated by the test sample is collected by a gas washing bottle containing 450ml (PH value 6.5±1.0; conductivity ≤0.5μS/mm) distilled water, test period: 30min. Requirements: PH≥4.3; conductivity≤10μS/mm.