Compound C2-I

Radiation crosslinkable compound for very flexible,
superior flame-retarded non-dripping and excellent
printable thin wall polyolefin heat-shrinkable tubing.

Compound properties

Compound C2-I is a radiation crosslinkable compound offering excellent chemical resistance and flame-retardancy properties. The carefully selected combination of polyolefin based polymers, flame-retardants , processing aids and additives makes this compound an excellent choice for the manufacturing of heat-shrinkable tubings which will easily meet the requirements of MIL-DTL-23053/5 class 3, UL 224-VW 1, CSA C22.2 No 198.1 OFT and VG 95343 Part 5 Type A.
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 Natural
Specific gravity ASTM D 792 1.4
Water absorption ASTM D 570 0.15%
MFI (160ºC, 21.6kg) ASTM D 1238 10
LOI ASTM D 2868 33%
Burning rate UL 94 V-O

Extrusion

Recommended extrusion temperature profile 125ºC - 130ºC - 140ºC - 150ºC - 155ºC
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 excellent flame-retardancy properties and is non-dripping. This makes the compound an excellent choice for applications were non-flame-propagating properties are required.
Tubing manufactured of this non-blooming compound shows superior printability properties for marker-sleeves and will shrink at temperatures of 90ºC.

Technical values

Property Test Method Typical value
 
Physical
Tensile strenght at break ASTM D 638 15 MPa
Elongation at break ASTM D 638 450%
 
Thermal
Continuous operating temperature   -55ºC to +135ºC
Minimum shrink temperature   90ºC
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 Excellent
Copper Corrosion ASTM D 2671 B Non corrosive
 
Electrical
Dielectric strength ASTM D 2671 20 kV/mm
Volume resistivity ASTM D 257 10 @ 13 ohm.cm

International specifications

- MIL-DTL-23053/5 class 3
- UL 224 VW-1
- CSA C22.2 No 198.1-98 OFT
- VG 95343 Part 5 Type A
 
 
 

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