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

Halogen free
AEI SX407:CM424 General purpose silane crosslinkable HFFR sheathing wiith LOCA approval
Low-smoke, low-toxicity, halogen-free, flame-retardant, silane crosslinkable compound for
insulation of LV cables and sheathing of all types of cables

Test	Test method	Unit	Typical value
Physical properties and mechanical properties
Density	BS 2782 Pt. 6 Mtd 620A-D	g/cm3	1.37
Tensile strength	IEC 60811-1-1	N/mm²	10
Elongation at break	IEC 60811-1-1	%	150
Typical ageing behaviour after 7 days at 135°C
Tensile strength Elongation at break	IEC 60811-1-2 IEC 60811-1-2	% variation % variation	+20 -15
Cure assessment by hot set test (forced cured at 80°C in water)
Elongation under load (20N/cm2 at 200°C)	IEC 60811-2-1	%	40
Permanent elongation after cooling	IEC 60811-2-1	%	5
Thermo mechanical properties
Hot Pressure Deformation at 100ºC	IEC 60811-3-1	%	15
Cold bend at -70°C	IEC 60811-1-4	-	Pass
Fire and smoke properties
Smoke density	ASTM 2843:2004	%	4.13
Oxygen index	BS ISO 4589-2	%	29
Temperature index	BS ISO 4589-3	oC	280
Halogen gas evolution	IEC 60754-1	%	<0.5
Electrical properties
Volume resistivity at 20°C	IEC 60502	Ω.cm	1.0 x10¹³
Dielectric strength at 20°C	IEC 80243	kV/mm	14.4
Permittivity at 50Hz at 23°C	IEC 60250	-	4.15

Extruder
Extruders of L/D ratios (length/diameter) of 15-24 and extruder screws of compression ratio 2:1 or less are
recommended.
Extruder temperature conditions
It is important that the melt temperature is not allowed to rise above 170ºC. As a guide the following temperature profile is recommended:-

Zone1	Zone2	Zone3	Head	Die
130°C	140°C	140°C	150°C	150°C

This profile will vary slightly depending on extruder type, head design and output.
Screw water temperature30-50°C
Recommended screen pack: 50 (mesh apertures per linear inch) or 300 micron
Crosslinking or cure
A satisfactory cure can be obtained either by immersion in hot water or exposure to low pressure steam at a temperature up to 65°C.
Catalyst and colour masterbatches
Addition of approved colour masterbatches, including black, up to a maximum of 1%, has no detrimental effect on the properties or crosslinking capability.
It is recommended that all masterbatches, including those containing the catalyst, 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
SX407 normally has shelf life of at least 6 months from the date of manufacture. The storage of silane crosslinkable
compounds in cool dry conditions will maximise useful shelf life. Other precautions are:-
• Packaging should remain sealed.
• Avoid temperature above 25°C.
• Avoid storage outside and in direct sunlight.
• Use within 8 hours of opening packaging.

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

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