Fibre Reinforced Polymer (FRP) glass-epoxy tubes are made by winding glass fibre saturated with epoxy composition on metal cores. The tube structure is programmed. It consists of successive overlapping layers of fibre, each with a specific winding angle. The direction of fibre layering in the layers depends on the type of loads carried by the tube. Most often, these include bending or, less frequently internal pressure, or bending and internal pressure at the same time, and torsion in some cases. Due to the directional properties of glass fibre, glass-epoxy tubes are characterized by a very high anisotropy of mechanical properties. Due to their excellent mechanical strength and electrical insulation properties, glass-epoxy composites are widely used in power engineering as isolating and structural components in overhead and indoor electrical AC and DC equipment.
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GENERAL PROPERTIES |
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Resin Type |
Epoxy Resin |
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Glass Type |
E, ECR |
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Wrapping Angles |
Combination: ±25°, ±53°, 90° |
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Operating Temperature |
-50°C … +100°C |
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Lifetime |
>30 years |
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MECHANICAL PROPERTIES |
Tube Type |
Unit |
Standard |
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bending |
pressure |
bending/pressure |
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Value |
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E – Bending Modulus |
>21 |
>11 |
>19 |
GPa |
PN-EN 61462 |
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Bending Strength |
>300 |
>100 |
>250 |
MPa |
PN-EN 61462 |
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Tensile Strength Parallel to the Axis |
>250 |
>160 |
>220 |
MPa |
PN-EN ISO 527-4 |
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Tensile Strength Perpendicular to the Axis |
>1900 |
>2800 |
>2400 |
N/mm |
PN-EN 1394 |
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>150 |
>220 |
>190 |
MPa |
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ELECTRICAL PROPERTIES |
Value |
Unit |
Standard |
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Puncture Strength Parallel to the Axis (50 Hz) |
≥3 |
kV/mm |
PN-EN 60243-1 |
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Puncture Strength Perpendicular to the Axis (50 Hz) |
≥8 |
kV/mm |
PN-EN 60243-1 |
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Water Diffusion Testing |
<1 |
mA |
PN-EN 62217 |
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Partial Discharge Level |
<2 |
PC |
PN-EN 60270 |
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Dielectric Permittivity εr (20°C, 50 Hz) |
<5.3 |
|
IEC 60250 |
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Electric Loss Factor tanδ (20°C, 50Hz) |
<20 |
10-3 |
IEC 60250 |
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PHYSICAL PROPERTIES |
Value |
Unit |
Standard |
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Content of Glass in the Material (by Weight) |
>77 |
% |
PN-EN ISO 1172 |
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Density |
2.05 |
g/cm3 |
PN-EN ISO 1183-1 |
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Glass Transition Temperature Tg |
>130 |
°C |
PN-EN 61006 |
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Dye Penetration Test |
>15 |
min |
PN-EN 62217 |
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Water Absorption |
<0.1 |
% |
PN-EN ISO 62 |
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Tightness |
<5·10-6 |
bar·cm3/s |
PN-EN 60068-2-17 |
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Flammability |
31.7 |
% |
PN-EN ISO 4589-2 |
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Colour |
Natural |
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Glass-epoxy tubes are compliant with PN-EN 61462.
Our portfolio includes tubes with internal diameters of:
ø80 mm, ø110 mm, ø120 mm, ø122 mm ø130 mm, ø150 mm, ø160 mm, ø180 mm, ø198 mm, ø200 mm, ø220 mm, ø228 mm, ø240 mm, ø248 mm, ø250 mm, ø300 mm, ø315 mm, ø328 mm, ø340 mm, ø350 mm, ø440 mm.
Tube Lengths: up to 4500 mm.
<>Other tube diameters then listed above can be made at customer's request.