125 Centigrade Irradiation Cross-linking Low-smoke Halogen-free Flame Retardant Jacketing for Low and Medium Power Cable
Experiment item
|
Unit
|
Standard value
|
Typical value
|
Test method
|
1Tensile strength
|
MPa
|
≥10.0(*10.0)
|
11.8(*10.7)
|
GB/T 1040
|
2Elongation at break
|
%
|
≥150(*180)
|
185(*205)
|
GB/T 1040
|
3. Aging 136 ± 2℃×168h
|
%
|
≤±20
|
+10
|
GB/T 2951
|
Change of tensile properties
|
GB/T 2951
|
|||
Change of elongation properties
|
%
|
≤±20
|
-12
|
GB/T 2951
|
4. Thermal deformation(200℃ × 15min, 0.2Mpa)
|
||||
Elongation under load
|
%
|
≤175
|
45
|
GB/T 2951
|
Permanent deformation after cooling
|
≤15
|
5
|
GB/T 2951
|
|
5. Low temperature brittleness properties
|
℃
|
≤-25
|
-40℃PASS
|
GB/T 5470
|
6. 20℃ DC volume resistivity
|
Ω•m
|
≥1×10^12
|
4.2×10^12
|
GB/T 1410
|
7. Electric strength
|
MV/m
|
≥20
|
27
|
GB/T 1408
|
8. Oxygen index
|
%
|
≥32
|
34
|
GB/T 2406
|
9. Smoke density
|
GB/T8323
|
|||
Flame combustion
|
≤100
|
55
|
GB/T8323
|
|
10. Halogen acid gas content
|
mg/g
|
≤5
|
<1
|
GB/T 17650
|
11. PH value
|
—
|
≥4.3
|
5.8
|
GB/T 17650
|
Conductivity
|
μs/mm
|
≤10
|
1.1
|
GB/T 17650
|