Material Properties
Insulation & Sheath Material Properties Related To Fireproof of Cable

Flexible
AEI TP-0870 Flexible thermoplastic general purpose HFFR sheathing
Flexible, low-smoke, halogen-free, flame retardant thermoplastic compound for cable insulation and sheathing

Extruder
An extruder with an L/D ratio (length/diameter) of 15-24 and an extruder screw with a compression ratio 1.5:1 or less are recommended.
Extruder temperature conditions
IIt is important that the melt temperature is not allowed to rise above 170°C.
As a guide the following temperature profile is recommended:-

This profile will vary slightly depending on extruder type, head design and output.
Screw water temperature Depends upon screw design, but should be 30-50°C
Recommended screen pack: 50 (mesh apertures per linear inch) or 300 micron
Masterbatches
Addition of approved colour masterbatches, including black, up to a maximum of 1%, has no detrimental effect on the properties.
It is recommended that all masterbatches should be thoroughly dried at 60°C for 8 hours or at 80°C for 4 hours in a de-humidifying drier.
Storage and shelf life
TP-0870 has an unlimited shelf life. However, the following precautions should be observed:-
• Packaging should remain sealed
• Avoid storage outside and in direct sunlight.