Compound A2-M
Moisture crosslinkable compound for very flexible, commercial, non
flame retarded general purpose thin wall heat-shrinkable tubing
Compound properties
Compound A2-M is a silane-grafted, moisture crosslinkable low cost, flexible
compound, designed for the manufacturing of thin wall non flame-retarded
heat-shrinkable tubing for commercial purposes where flame-retardancy
is not required.
The compound can be easily colored by adding standard color masterbatches
based on PE or EVA.
Compound characteristics
| Color |
|
Natural |
| Specific gravity |
ASTM D 792 |
1.25 |
| Water absorption |
ASTM D 570 |
0.2% |
| MFI (160ºC, 21.6kg) |
ASTM D 1238 |
6-8 (*) |
Extrusion
| Recommended extrusion temperature profile |
125ºC - 130ºC - 135ºC - 140ºC |
| Recommended draw-down ratio |
1.10 : 1 |
Crosslinking
| Recommended time |
Minimum 72 hours to ensure full crosslinking (**) |
| Recommended temperature |
75ºC at 100% relative humidity (water vapour) |
| Conditioning |
48 hours at 75ºC |
| Hot-set elongation |
130 - 160 % (150ºC and 35 gr/mm2 load) |
Packaging
To avoid premature crosslinking and to achieve a 6 months shelf-life after
date of production, all moisture crosslinkable PTL compounds are packed
in aluminium coated bags of 25 kg and should be stored below 30ºC.
Tubing properties
Heat-shrinkable tubing made of this compound will show a continuous operating
temperature of 125ºC. The excellent heat-ageing properties allows the
product to withstand 175ºC for short periods. Heat-shrinkable tubing manufactured
with this compound will shrink at temperatures above 90ºC.
Tubing made of this non-blooming compound shows excellent printability
properties and are halogen- and cadmium free.
Technical values
| Property |
Test Method |
Typical value |
| |
| Physical |
| Tensile strenght at break |
ASTM D 638 |
14 MPa |
| Elongation at break |
ASTM D 638 |
400% |
| |
| Thermal |
| Continuous operating temperature |
|
-55ºC to +125ºC |
| Minimum shrink temperature |
|
90C |
| Heat shock (4hrs @ 250ºC) |
ASTM D 2671 |
No cracking, dripping, flowing |
| Heat ageing (168hrs @ 150ºC) |
ASTM D 638 |
Elongation 300% |
| Low temp. flexibility (-55ºC) |
ASTM D 2671C |
No cracking |
| |
| Chemical |
| Fungus resistance |
MIL-DTL-7444 |
Inert |
| Fluid resistance |
MIL-DTL-23053/5 |
Good |
| Copper Corrosion |
ASTM D 2671 B |
No corrosion |
| |
| Electrical |
| Dielectric strength |
ASTM D 2671 |
20 kV/mm |
| Volume resistivity |
ASTM D 257 |
10 @ 14 ohm.cm |
International specifications
- FMVSS 302
(*) In non-crosslinked state
(**) The crosslinking time is depending on wall-thickness.
|
