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

Crack resistant
AEI TP521 Thermoplastic general purpose, highly crack resistant HFFR sheathing
Thermoplastic, low smoke, halogen free, flame retardant compound for cable insulation and sheathing

Test		Test method	Unit	Typical value
Physical properties and mechanical properties
Density		BS 2782 Pt. 6 Mtd 620A-D	g/cm3	1.5
Tensile strength		IEC 60811-1-1	N/mm²	13
Elongation at break		IEC 60811-1-1	%	160
Tear Strength		BS 6469	N/mm	7
Melt Flow Rate (21.6kg @150°C)		AEI Method	g/10 minutes	6
Hardness (N)		Shore A	-	90
Typical ageing behaviour after 7 days at 100°C
Tensile strength		IEC 60811-1-2	% Variation	-10
Elongation at break		IEC 60811-1-2	% Variation	+13
Thermo mechanical properties
Hot pressure deformation at 100°C		IEC 60811-3-1	%	30
Cold bend test at -50°C		IEC 60811-1-4		pass
pass Elongation at break at -30°C		IEC 60811-1-4	%	60 (pass)
Cold impact at -30°C		IEC 60811-1-4		pass
Thermal crack resistance @ 80°C		AEI internal method		pass
Fire & smoke properties
Oxygen Index		BS ISO 4589-2	%	30
Temperature Index		BS ISO 4589-3	°C	270
Halogen Acid Gas Evolution		IEC 60754-1	%	<0.5
Electrical properties
Insulation Constant Ki at 20°C		IEC 60502	MΩ.km	7.7
Insulation Constant Ki at 90°C		IEC 60502	MΩ.km	0.057
Fluid resistance			Temperature ° C
		Time (hrs)	% Variation in TS	% Variation in EB
ASTM No2	4	23	9	2
ASTM No2	4	70	14	24
ASTM No2	4	100	28	48

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
It is important that the melt temperature is not allowed to rise above 170°C.
As a guide the following temperature profile is recommended:-

Zone1	Zone2	Zone3	Zone4	Head	Die
120°C	130°C	140°C	150°C	160°C	160°C

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
TP521 has an unlimited shelf life. However, the following precautions should be observed:-
• Packaging should remain sealed
• Avoid storage outside and in direct sunlight.

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

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