Compound A1-I
Radiation crosslinkable compound for very flexible, transparent thin
wall
polyolefin heat-shrinkable tubing.
Compound properties
Compound A1-I is a radiation crosslinkable compound offering excellent
chemical resistance and physical properties. The carefully selected combination
of polyolefin based polymers, processing aids and additives makes this
compound an excellent choice for the manufacturing of transparent
heat-shrinkable tubings which will easily meet the requirements of MIL-DTL-23053/5
class 2 and VG 95343 Part 5 Type B.
The compound is easy processable at high speeds with minimal melt fracture
and can be extruded on standard PE or PVC screws having a 2:1 pressure
ratio.
Compound characteristics
| Color |
|
Transparent |
| Specific gravity |
ASTM D 792 |
0.95 |
| Water absorption |
ASTM D 570 |
0.15% |
| MFI (160ºC, 21.6kg) |
ASTM D 1238 |
10 |
Extrusion
| Recommended extrusion temperature profile |
100ºC - 110ºC - 120ºC - 125ºC - 125ºC |
| Recommended draw-down ratio |
1.10 : 1 |
Crosslinking
| Recommended dose |
30 - 60 kGy |
| Hot-set elongation |
75 - 150 % (150ºC and 35 gr/mm2 load) |
Packaging
The compound is packed in sealed PE bags of 25 kg.
We recommend to store the compound below 30ºC.
Tubing properties
Heat-shrinkable tubing made of this compound will show a continuous operating
temperature of 135ºC. The excellent heat-ageing properties allows the
product to withstand 250ºC for short periods.
The compound shows good transparency. This makes the compound an excellent
choice for those applications where it is essential that the substrate
is visible and will shrink at a temperature of 100ºC.
Technical values
| Property |
Test Method |
Typical value |
| |
| Physical |
| Tensile strenght at break |
ASTM D 638 |
16 MPa |
| Elongation at break |
ASTM D 638 |
500% |
| |
| Thermal |
| Continuous operating temperature |
|
-55ºC to +135ºC |
| Minimum shrink temperature |
|
100ºC |
| Heat shock (4hrs @ 250ºC) |
ASTM D 2671 |
No cracking, dripping, flowing |
| Heat ageing (168hrs @ 150ºC) |
ASTM D 638 |
Elongation 400% |
| Low temp. flexibility (-55ºC) |
ASTM D 2671C |
No cracking |
| |
| Chemical |
| Fungus resistance |
MIL-DTL-7444 |
Inert |
| Fluid resistance |
MIL-DTL-23053/5 |
Excellent |
| Copper Corrosion |
ASTM D 2671 B |
Non corrosive |
| |
| Electrical |
| Dielectric strength |
ASTM D 2671 |
25 kV/mm(*) |
| Volume resistivity |
ASTM D 257 |
10 @ 13 ohm.cm |
International specifications
- MIL-DTL-23053/5 Class 2
- VG 95343 Part 5 Type B
(*) Depending on wall thickness.
|
