FRP Dog Bone Spacer is a pultruded fiberglass reinforced insulation profile designed for dry type transformers, reactors and other electrical equipment.
It provides reliable winding support, electrical insulation and cooling ventilation channels while maintaining excellent mechanical strength and thermal stability.
Manufactured from high-strength fiberglass and thermosetting resin systems, FRP insulation profiles offer long service life, low dielectric loss and resistance to heat, moisture and aging.
Custom dimensions and profile designs are available according to customer drawings and application requirements.
• High Mechanical Strength
Provides stable support for transformer windings and insulation structures under long-term operating conditions.
• Excellent Electrical Insulation
Low dielectric loss and high surface resistivity help improve system reliability and safety.
• High Temperature Resistance
Suitable for Class F and Class H insulation systems with operating temperatures up to 180°C.
• Low Partial Discharge
Designed to minimize partial discharge and enhance transformer performance.
• Corrosion & Aging Resistance
Resistant to moisture, chemicals and environmental aging.
• Custom Manufacturing
Available in different shapes, dimensions and resin systems according to customer requirements.
• Dry Type Transformers
• Cast Resin Transformers
• Reactors
• Power Capacitors
• High Voltage Inverters
• Switchgear
• Electrical Insulation Structures
• Industrial Electrical Equipment
• FRP Dog Bone Spacer
The most widely used insulation spacer for transformer windings. Its unique profile design provides both mechanical support and cooling air channels.
• FRP Corner Profile
L-shaped insulation profile used for structural reinforcement and insulation support in transformer assemblies.
• FRP T Profile
Designed for positioning and supporting insulation structures in electrical equipment.
• FRP U Profile
Suitable for cable support, insulation assembly and structural protection.
• Custom Pultruded Profiles
Custom shapes and dimensions can be produced according to drawings or samples.
Our FRP insulation profiles are manufactured using advanced pultrusion technology to ensure consistent dimensional accuracy and stable electrical performance.
From fiberglass impregnation and profile forming to cutting and quality inspection, every production stage is carefully controlled to meet industrial insulation requirements.
We support both standard products and customized projects for transformer, reactor and electrical equipment manufacturers worldwide.
Manufacturing Advantages:
• Advanced Pultrusion Production Lines
• Strict Quality Control Process
• Custom Profile Development
• Precision Cutting Service
• OEM & ODM Manufacturing
• Fast Production and Delivery
We manufacture FRP insulation profiles according to customer drawings and specifications.
Customization options include:
• Profile Shape
• Dimensions
• Cutting Length
• Resin System
• Insulation Class
• Surface Finish
• Color Requirements
OEM and custom pultrusion projects are welcome.
| Property | Value |
| Color | Off-white, Light Green; Red/Grey customized |
| Density | 1.9–2.1 g/cm³ |
| Water Absorption | ≤0.1% |
| Flexural Strength | ≥600 MPa |
| Impact Strength | ≥300 kJ/m² |
| Surface Resistivity | ≥1×10¹² Ω |
| Breakdown Voltage | ≥12 kV/mm |
| Heat Resistance | Up to 180°C |
| Insulation Class | Class F / Class H |
Q: What is an FRP Dog Bone Spacer?
A: An FRP Dog Bone Spacer is a fiberglass reinforced insulation profile used in dry type transformers to provide winding support, insulation separation and cooling air ducts.
Q: What insulation classes are available?
A: Most FRP insulation profiles are available in Class F (155°C) and Class H (180°C) insulation systems depending on resin formulation.
Q: Can you manufacture according to customer drawings?
A: Yes. We provide custom pultrusion solutions based on customer drawings, samples or technical requirements.
Q: What resin systems are available?
A: Common resin systems include epoxy resin, polyester resin and vinyl ester resin depending on application requirements.
Q: What colors are available?
A: White and green are the most common colors. Custom colors may also be available upon request.
Q: What industries use FRP insulation profiles?
A: They are widely used in transformers, reactors, switchgear, power capacitors, electrical equipment and industrial insulation systems.
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