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PVC cable mass is usually compounded in two stages:
hot/cold mixing in the powder phase, followed by compounding and pelletizing on a Co-Kneader.
Compounding requirements can be summarized as follows.
The plasticizers and other constituents like stabilizers, additives, fillers, reinforcements, flame retardants and others. are absorbed in the porous PVC grain and then must be systematically gelled, dispersively and distributively mixed, and agglomerated. This is all in compliance with well defined temperature limits. Custom-tailored property profiles lead to a wide variety of formulations, with efficient production in rather decreasing batch sizes.
Here are two examples:
Softener formulation adjustment can raise the continuous operating temperature limit to 105°C.
Aluminium trihydroxide (ATH) additive can systematically reduce flammability and smoke formation. Regulatory authorities such as the VDE, EN or UL issue standardized property profiles for insulation and coating compounds.
Cable PVC Compounds Types:
Technical Data:
| Items | Unit | Typical Value | Testing Method | ||
| 70 ℃ PVC Cable Compound | 105 ℃ PVC Cable Compound | 105 ℃ Irradiated crosslinked FR PVC Compound | |||
| Tensile Strength | Mpa | 11 | 11 | 12 | GB/T 1040.3-2006 |
| Elongation at Break | % | 180 | 180 | 180 | |
| Heat Aging | |||||
| Testing Termperature | ℃ | 100 | 135 | 135 | GB/T 8815-2008 |
| Testing Time | h | 168 | 168 | 168 | |
| Variation at tensile strength | % | 20 | 20 | 20 | |
| Variation at elongation | % | -15 | -15 | -15 | |
| Low Temperature Brittleness | ℃ | -20 | -20 | -20 | GB/T 5470-2008 |
| Oxygen Index | / | ≥23 | ≥23 | ≥28 | GB/T 2406.2-2008 |
| Density | g/cm3 | 1.42 | 1.42 | 1.42 | GB/T 1033.1-2008 |
| Hardness | Shore A | 70-96 | 70-96 | 70-96 | GB/T 2411-2008 |