I. Illustration
With Chlorinated Polyethylene (here below called CPE), blended with other additives and pigments, DCH 21A Jacket has excellent properties of fire retardancy, oil-proof, wearing-proof, tearing-proof, cold-resistance and excellent mechanical properties. With is excellent properties, excellent extruded rubber surface, good flexibility, lower density & lower cost, our 21A is the first ideal substitution of CR or shipping cable and CSM based rubber sheath.
II. Application
Our DCH 21A is researched out according to our newest national standard for shipping cable. The product properties resulted from cured sheet or extrusion-rubber continuous cure all reach or overpassed the national standard.
III. Comparison of Material Properties & Standard
| No. |
Test Item |
Unit |
GB7594-87
XH-21A |
DCH21A
Sheet |
DCH21A
Final Pdt |
| 1 |
Mechanical properties before aging |
|
|
|
|
| 1.1 |
Tensile Strength |
Mpa |
≥11.0 |
14.0 |
13.5 |
| 1.2 |
Elongation at break |
% |
≥250 |
420 |
435 |
| 2 |
Mechanical properties after ageing (120°C, 7days) |
|
|
|
|
| 2.1 |
Change ratio of Tensile Strength (Maximum) |
% |
-15 - +15 |
8.5 |
8.0 |
| 2.2 |
Change ratio of Elongation at break (Maximum) |
% |
-25 - +25 |
-15 |
-17 |
| 3 |
Heat-extending test |
|
|
|
|
| |
Test condition |
Temperature |
°C |
200 |
|
|
| Load time |
min |
15 |
|
|
| Mechanical stress |
Mpa |
0.2 |
|
|
| 3.1 |
Elongation in load |
% |
≤175 |
40 |
30 |
| 3.2 |
Permanent set after cooling |
% |
≤25 |
10 |
5 |
| 4 |
Dipped mine oil test |
|
|
|
|
| |
Tensil strength |
Oil temperature |
°C |
100±2 |
|
|
| Oil-absorption time |
h |
24 |
|
|
| 4.1 |
Change ratio of Tensile Strength (Maximum) |
% |
-40 - +40 |
-9 |
-10 |
| 4.2 |
Change ratio of Elongation at break (Maximum) |
% |
-40 - +40 |
-14 |
-16 |
| 5 |
Low temperature Tensile test (-35°C) |
|
|
|
|
| |
Maximum elongation at break |
% |
|
90 |
|
| 6 |
Scorched time（140°C） |
Min |
|
> 30 |
|
Oxygen Index can be adjusted according to the customers' requirement.
IV. Processing Condition
Continuous vulcanization production method is preferred
Reduction ratio of extruder: 1.1:1-1.5:1
Length-diameter ratio: 6:1-16:1(hot feed is suggested if lower than 10:1)
Temperature of extruder: 65-85°C
Curing pipe's temperature: 80-200°C(13-15Mpa)
V. Package & Storage
Generally, 25kgs in one carton box or depends on customers' requirements.
Shape of the material: Rectangle rubber sheet & depends on customers' request.
The material should be stoned at clean, dry, draughty warehouse. |
