The 3 Reasons LSZH Compounds Fail in Cable Production
Many cable manufacturers assume that if an LSZH compound (Low Smoke Zero Halogen compound) passes laboratory tests, it will perform perfectly in production.
In reality, most problems appear on the extrusion line - not in the lab.
After working closely with cable manufacturers producing electric cables, HFFR wires, ZHFR wires, and optical fibre cables, we often see three common reasons for LSZH/ZHFR compound failures in production.
1) Poor Dispersion of Flame Retardant Fillers
LSZH compounds typically contain a high loading of mineral fillers.
If dispersion is not uniform:
- Surface roughness appears on the cable
- Mechanical properties drop
- Smoke performance becomes inconsistent
Proper compound design and mixing technology are critical to maintain uniform filler distribution.
2) Inconsistent Batch-to-Batch Properties
For cable manufacturers, consistency is everything.
Even a small variation in MFI, filler dispersion, or polymer ratio can cause:
- Extrusion instability
- Diameter fluctuations
- Variation in tensile and elongation properties
Reliable cable compounds must behave identically across batches to maintain stable cable production.
3) Compound Not Optimised for the Extrusion Line
Many LSZH compounds pass lab tests but are not optimised for the customer's extrusion conditions.
Factors such as:
- Screw design
- Processing temperature
- Line speed
- Cooling conditions
All these factors influence compound behaviour.
The best results come when compound formulation is matched to the cable manufacturer’s processing line.
The Real Lesson
LSZH / ZHFR compounds are not just about passing flame or smoke tests.
They must deliver stable processing, predictable behaviour, and consistent performance across:
- Electric cables
- HFFR wires
- ZHFR wires
- Optical fibre cables
- Data centre and infrastructure cables
That’s why successful cable manufacturers increasingly look for technical partnership - not just material supply.
Industry Insight
Curious to hear from cable manufacturers and process engineers.
Have you experienced LSZH or ZHFR compound issues on the extrusion line, even when lab reports looked perfect?
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The 3 Reasons LSZH Compounds Fail in Cable Production
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