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Silicone heat-shrink tubing

Series

HFGST

HFGST silicone heat-shrink tubing is produced from very high quality materials that make it suitable for use in sectors such as rail, where halogen-free materials with very low smoke opacity are mandatory.

HFGST tubing offers good resistance to high temperatures and high elasticity, consistently ensuring excellent insulation and thermal protection. Its operating temperature ranges from -50°C to +200°C.

Technical characteristics Product dimensions

Characteristic	Unit	Reference standard	Typical value
Colour	—	—	Grey
Shrink temperature	°C	UL 224	+80°C
Service temperature	°C	UL 224	From -50°C to +200°C
Shrinkage	%	Internal method	≥ 47 %
Concentricity	—	UL 224	≥ 65
Density	g/cm³	ASTM D 1817	1.2 +/-0.1
Hardness	Shore A	ASTM D 2240	From 60 to 75 Shore A
Tensile strength	MPa	ASTM D 624	≥ 4
Elongation at break	%	ASTM D 412	≥ 300
Tear strength	KN/m	ASTM D 624	≥ 14
Dielectric strength	KV/mm	ASTM D 149	≥ 23
Dielectric constant	—	ASTM D 150	2.5-3.5
Dissipation factor	—	ASTM D 150	0.001
Shrink ratio	—	—	From 1.6÷1 to 1.9:1
Volume resistivity	Ω/cm	ASTM D 149	1×10¹²
Flame resistance	—	UL 224	VW-1

Standard colour

Grey

Operating temperature

From -50°C to +200°C

Shrink ratio

From 1.6:1 to 1.9:1

Approval to specification

EN 45545-2:2015

Part number	Before shrinking	After shrinking	Wall thickness
HFGST-23-GY	2.3 mm	1.3 mm	0.5 mm
HFGST-30-GY	3 mm	1.6 mm	1 mm
HFGST-49-GY	4.9 mm	2.6 mm	1 mm
HFGST-60-GY	6 mm	3.4 mm	1 mm
HFGST-78-GY	7.8 mm	4.2 mm	1 mm
HFGST-110-GY	11 mm	5 mm	1.5 mm
HFGST-155-GY	15.5 mm	8.5 mm	1.5 mm
HFGST-210-GY	21 mm	11.5 mm	2 mm
HFGST-230-GY	23 mm	16 mm	2 mm
HFGST-315-GY	31.5 mm	18 mm	2 mm

Silicone heat-shrink tubing

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