What is the Polyester FiberSheet?
Because of its excellent insulating properties and mechanical strength polyester fiber sheet is very widely used in the electrical industry. High-quality synthetic polyester fibers are used to make this, engineered to offer reliable performance in a wide range of electrical applications. It has outstanding dielectric strength and is ideally suited for use as an insulating layer in transformers, motors, and similar high-voltage equipment. Even in the most demanding operating environments, it provides long-term durability through its resistance to moisture, heat, and chemical exposure. Besides insulating, its properties make it quite light and easy to process to cut, shape, or laminate to meet specific design requirements. For the fabrication of composite laminates or as structural components in electrical enclosures or circuit boards, it is generally used as a base material. It has great stability under thermal and electrical stress and serves as a very important factor in achieving the safety and efficiency of electric systems.
Parameters
Form I： Nominal Thickness and Allowable Tolerance|
Nominal Thickness
mm
|
Allowable Tolerance
mm
|
Nominal Thickness
mm
|
Allowable Tolerance
mm
|
|
0.2
|
±0.07
|
5.0
|
±0.48
|
|
0.3
|
±0.07
|
5.5
|
±0.48
|
|
0.4
|
–
|
6.0
|
±0.58
|
|
0.5
|
±0.14
|
6.5
|
±0.58
|
|
0.6
|
—
|
8.0
|
±0.68
|
|
0.8
|
±0.14
|
10.0
|
±0.80
|
|
1.0
|
±0.22
|
12.0
|
±1.00
|
|
1.2
|
±0.22
|
14.0
|
±1.00
|
|
1.5
|
±0.22
|
16.0
|
±1.30
|
|
1.6
|
—
|
20.0
|
±1.30
|
|
1.8
|
±0.28
|
25.0
|
±1.50
|
|
2.0
|
±0.28
|
30.0
|
±1.50
|
|
2.5
|
±0.33
|
35.0
|
±2.00
|
|
3.0
|
±0.33
|
40.0
|
±2.00
|
|
3.5
|
±0.33
|
45.0
|
±2.20
|
|
4.0
|
±0.38
|
50.0
|
±2.20
|
|
4.5
|
±0.38
|
Form II： Properties
|
No.
|
Property
|
Unit
|
Value
|
||
|
1
|
Bending strength across layers
|
Normal Condition
|
MPa
|
≥400
|
|
|
150±2℃
|
≥200
|
||||
|
2
|
Impulse strength along layers
(Beam method)
|
kJ/m2
|
≥50(vertical)
|
||
|
3
|
Withstand voltage vertical to layers，（in 90℃±2℃ oil）
|
MV/m
|
See Form III
|
||
|
4
|
Dielectric loss factor
|
below 48Hz~62Hz |
–
|
≤0.05
|
|
|
below 1MHz
|
–
|
||||
|
Density
|
g/cm3
|
≥1.70
|
|||
|
5
|
Withstand voltage parallet to layers
|
kV
|
≥30
|
||
|
6
|
Insulation resistance parallel to layers
|
Normal condition
|
MW
|
≥1.0×104
|
|
|
Absorbed in water
for 24h
|
≥1.0×102
|
||||
|
7
|
Volume resistivity
|
Normal condition
|
MW.m
|
≥1.0×105
|
|
|
Absorbed in water
for 24h
|
≥1.0×103
|
||||
|
180±2℃
|
≥1.0×103
|
||||
|
8
|
Surface resistivity
|
Normal condition
|
MW
|
≥1.0×106
|
|
|
Absorbed in water
for 24h
|
≥1.0×104
|
||||
|
180±2℃
|
≥1.0×104
|
||||
|
9
|
Temperature Index (TI)
|
–
|
≥180
|
||
Form III： Electrical strength Vertical to Layers
|
Thickness
mm
|
Value
MV/m |
Thickness
mm |
Value
MV/m
|
|
0.5
|
≥22
|
1.8
|
≥20
|
|
0.6
|
≥22
|
2.0
|
≥20
|
|
0.7
|
≥22
|
2.2
|
≥18
|
|
0.8
|
≥22
|
2.4
|
≥18
|
|
0.9
|
≥22
|
2.5
|
≥18
|
|
1.0
|
≥22
|
2.6
|
≥18
|
|
1.2
|
≥20
|
2.8
|
≥18
|
|
1.4
|
≥20
|
3.0以上
|
≥18
|
|
1.6
|
≥20
|
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Features
- High Dielectric Strength:
Insulation is excellent on polyester fiber sheets and is ideal for high-voltage applications such as transformers and motors.
- Thermal Stability:
These sheets are capable of operating in elevated temperature environments with minimal deformation and therefore will continue to provide reliable performance in thermally demanding applications.
- Moisture Resistance:
The low water absorption enables degradation or electrical conductivity change-free durability under humid conditions.
- Chemical Resistance:
They resist oils, solvents, and other common chemicals found in electrical systems, and are stable over a long period.
- Mechanical Strength:
Tensile and compressive strength, both high, for structural support of components in electrical equipment.
- Lightweight and Versatile:
Polyester sheets are easy to cut, shape, or laminate to create custom products for many applications, including insulation barriers and circuit board substrates.
- Environmental Resistance:
Provide high resistance to UV light as well as to environmental aging and are suitable for inside and outside use for electrical installations.
Application
- Transformer Insulation Components:
Used as interlayer insulation in transformers, they separate and protect windings to efficiently transfer energy, and prevent electrical breakdown.
- Busbar Insulation:
These sheets are used as insulation barriers around busbars in switch gear, having high dielectric properties to provide safety and reliability in power distribution systems.
- Generator Slot Liners:
In generators, they are used as a liner in the slots of the generator to provide insulation between the stator winding and core for increased life of the machine.
- Insulating Barriers in Control Panels:
Used in control panels, they are insulating barriers restricting conductive components from short circuits and increasing safety.
- High-Voltage Cable Wrapping:
They mechanically protect the high-voltage cables and also add to the insulation for better system performance.
- Electrical Coil Support:
These sheets act as support for electrical coils in motors and the relays provide mechanical stability and provide increased insulation under the stresses imposed by operation.
- Custom Electrical Enclosure Linings:
Liner inside of electrical enclosure walls are made up of polyester fiber sheets that insulate conductive parts from the walls of that enclosure.
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