Aramid Fibre Pressboard for Transformer & Electrical Insulation
Medium and high-density aramid pressboard engineered for reliable electrical insulation, structural support, and oil-immersed transformer applications.
Product Overview
Aramid Pressboard for Demanding Insulation Systems
Electrical insulation inside transformers and rotating machines often needs to do more than provide dielectric separation. Structural components must also retain their shape and integrity while operating under mechanical pressure and, in many applications, continuous exposure to insulating oil.
3A Associates’ Aramid Fibre Pressboard addresses these requirements with two density options designed for different insulation duties. The medium-density variant is suited to moulded insulation components such as V-rings, angle rings, gap gaskets, and round sleeves.
For applications involving greater mechanical loads, the high-density variant provides enhanced compression resistance, making it particularly suited to gaskets and structural components inside oil-immersed transformers.
Both variants are designed to perform in air as well as oil, with dielectric performance increasing substantially following oil impregnation. Large sheet formats also allow bigger insulation components to be produced with fewer joints.
Key Features
1. Two Density Options
Medium and high-density variants address different electrical and structural insulation requirements.
2. Oil-Immersed Performance
Dielectric strength increases significantly when the pressboard is impregnated with insulating oil.
3. High Compression Resistance
High-density construction maintains integrity when subjected to sustained mechanical clamping loads.
4. Aramid Fibre Construction
Provides a dependable insulation base for demanding transformer and rotating-machine components.
5. Large Sheet Availability
Large sheet formats help reduce joints when producing sizeable structural insulation components.
Designed For
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Oil-immersed transformer components
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Moulded electrical insulation parts
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Transformer gaskets and spacers
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V-rings and angle rings
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Rotating machine slot wedges
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Liquid-filled transformer systems
Benefits
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Matches density to application requirements
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Performs reliably in air and oil
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Maintains integrity under compression
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Supports large insulation components
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Reduces joints in fabricated parts
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Handles structural insulation requirements
ADVANTAGES OF 3A ARAMID FIBRE PRESSBOARD
Medium and high-density grades available
Strong dielectric performance after oil impregnation
Excellent resistance to sustained compression loads
Large sheet formats for efficient fabrication
Suitable for structural and electrical insulation
Reliable performance across demanding applications
Real-World Use Cases
Oil-immersed transformer gaskets
Generator slot and layer insulation
Transformer winding and interlayer insulation
Oil-filled transformer insulation systems
UPS and data centre converter insulation
Rotating-machine insulation spacers
Send Enquiry
Find the Right Aramid Pressboard for Your Application
Share your required density grade, thickness, sheet dimensions, and application details, and our team will help identify the appropriate aramid pressboard specification.