Main safety characteristic
A:Surface resistance value: ≤ 3 × 108Ω
B:Drum Friction performance : the surface temperature of the drum is ≤ 325 ℃, and there is no flame
combustion or flameless combustion.
C:Combustion performance of alcohol blowtorch:
Test piece with covering layer: average value ≤ 3.0 S, single value ≤ 10.0 S
Test piece without of covering layer: average value ≤ 5.0 S, single value ≤ 15.0 S
D:Tunnel propane combustion performance: retention length of undamaged lenght ＞ 600mm
Covering characteristics ( MT / T914-2019 )
| Tensile strength/MPa | Elongation at break% | Abrasion/mm |
| ≥10.0 | 350% |
≤200 |
Note：again test（70℃）×After 168h，the change rate of tensile strength and Elongation at
break of PVG coating shall not be great than 25% of the measured value before aging.
Adhesive strength
| Cover rubber to core | Core interior | Between core layers | |
| Average value | ≥4.00 | --- | ≥3.50 |
| Minimum value | ≥3.25 | ≥6.5 | ≥3.25 |
Main physical properties
|
ensile strensth |
Minimum warp strength N/mm |
Minimum weft strength N/mm |
Minimum tear force N | Minimum elongation at break in warp direction |
Min weft direction at bre |
| 680/1 level four |
680 |
265 | 1090 | 15 | 18 |
| 800/1 level five | 800 | 280 | 1180 | 15 | 18 |
| 1000/1 level six | 1000 | 300 | 1180 | 15 | 18 |
| 1250/1 level seven | 1250 | 350 | 1540 | 15 | 18 |
| 1400/1 level eight | 1400 | 350 | 1540 | 15 | 18 |
| 1600/1 level nine | 1600 | 400 | --- | 15 | 18 |
| 2000/1 level ten | 680 | 400 | --- | 15 | 18 |
| 2000/1 level eleven | 2680 | 400 | --- | 15 | 18 |
