Grade
|
Testing temperature(≤)
|
T1
|
100℃
|
T2
|
125℃
|
T3
|
150℃
|
T4
|
175℃
|
Item
|
Grade
|
||||
T1
|
T2
|
T3
|
T4
|
||
Changing range allowed
|
|||||
Hardness
|
Difference between before-aging and after-aging (IRHD)
|
+20
|
+20
|
±20
|
±20
|
Maximum value after aging (IRHD)
|
85
|
85
|
85
|
85
|
|
Tensile strength
|
Change rate of property/ %
|
-25
|
-30
|
-40
|
-40
|
Minimum value after aging/ MPa
|
12
|
10
|
5
|
5
|
|
Breaking elongation
|
Change rate after aging/ %
|
-50
|
-50
|
-55
|
-55
|
Minimum value after aging/ %
|
200
|
200
|
180
|
180
|
Nominal belt type
|
160
|
200
|
250
|
315
|
400
|
500
|
630
|
800
|
1000
|
1250
|
1600
|
2000
|
2500
|
3150
|
Item
|
Ply to ply
|
Rubber cover to ply
|
All samples average value/ (N/mm) ≥
|
4.5
|
3.5
|
All samples min peak value/ (N/mm) ≥
|
3.9
|
2.9
|