Transformer Insulation Paper & Pressboard
Polyester Composite Insulation Sheet for Dry-Type Transformers
DMD Polyester composite insulation board is manufactured by bonding multiple layers of polyester film and polyester nonwoven fabric with a special heat-resistant adhesive, followed by surface treatment with a special insulating resin. It is primarily used to form insulation cylinders between high-voltage and low-voltage windings in dry-type transformers.
Type: Insulation composite sheet
Thermal Class: F Class 155℃
Thickness: 0.5mm 0.8mm 0.9mm etc
Width: 780/880/1040/1240mm etc
Color: Reddish brown/White
Description
Product Overview
DMD Polyester composite insulation board is manufactured by bonding multiple layers of polyester film and polyester nonwoven fabric with a special heat-resistant adhesive, followed by surface treatment with a special insulating resin. It is primarily used to form insulation cylinders between high-voltage and low-voltage windings in dry-type transformers.
Chengrui Polyester Composite Insulation Sheet is designed for forming insulating cylinders and barriers between high-voltage and low-voltage windings in dry-type transformers.
The material is manufactured by bonding multiple layers of polyester film (PET) and polyester nonwoven fabric with a heat-resistant adhesive. After lamination, the outer surfaces receive a special insulating resin treatment.
The composite combines electrical insulation, mechanical strength and formability. Low shrinkage and low moisture absorption help maintain dimensional stability, while the material can be cut and formed into cylindrical barriers to suit transformer winding designs.
Key Features
1. Transformer cylinder application: Designed for insulation barriers between high-voltage and low-voltage windings.
2. Resin-treated surfaces: Additional insulating resin treatment applied after lamination.
3. Multilayer polyester construction: PET film and polyester nonwoven fabric bonded with a heat-resistant adhesive.
4. Strength and formability: Combines mechanical strength with the ability to form curved insulation components.
5. Dimensional stability: Low shrinkage and moisture absorption help maintain the required dimensions.
Main Application
• Dry-type transformers: Used between the high- and low-voltage coils of dry-type transformers; can serve as an insulating cylinder—replacing epoxy resin boards or tubes—to provide both isolation and structural support.
• Motors and electrical appliances: Used for insulation within high- and low-voltage motors and electrical equipment—specifically between slots, phases, turns, and layers.
Storage and Shelf Life
Store upright in a dry, well-ventilated and clean environment at room temperature. Keep away from flames, heat sources and direct sunlight.
The shelf life is 12 months under the specified storage conditions. Material beyond this period may still be used after inspection confirms compliance with the required specifications.
Parameter
| Type | DMD Insulation composite sheet | |||||
| Thermal Class | F Class 155℃ | |||||
| Thickness | 0.5mm 0.8mm 0.9mm etc | |||||
| Width | 780/880/1040/1240mm etc | |||||
| For more information, please contact us: [email protected] | ||||||
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Quick Answers for You
Quick answers to your pressing questions.
Q: What thickness, width, length, and tolerance can you supply?
A: Chengrui Insulation can supply standard sizes and also customize dimensions according to customer drawings or application requirements. The tolerance depends on material type, thickness, and processing method. Before quotation, customers should confirm thickness, width, length, quantity, roll weight, or drawing dimensions.
Q: Can you process according to drawings, such as strips, punching, CNC machining, molded parts, and oil duct spacers?
A: Chengrui Insulation can provide custom processing according to drawings, not only raw insulation materials. Common processing includes strip cutting, punching, chamfering, slotting, CNC machining, and components etc.
Q: Is this material suitable for my transformer type, oil-immersed or dry-type?
A: Chengrui Insulation can offer insulation materials both for oil-immersed transformers and dry-type transformers. Common materials for oil-immersed transformers include electrical kraft paper, diamond dotted paper, crepe paper, insulation pressboard, pressboard strips, oil duct spacers, insulation cylinders, and laminated wood. They are widely used for winding insulation, interlayer insulation, end insulation, oil ducts, and support structures. For dry-type transformers requiring higher thermal performance, we normally recommend NMN, NHN, AMA, polyimide film, epoxy fiberglass sheets, etc
Q: Are you a trader or manufacturer?
A: Chengrui combines our own manufacturing capabilities (flexible laminates, insulation sleeving etc) with a qualified partner production network. This allows us to supply a broader range of electrical insulation materials while maintaining specification control, quality inspection and technical support.
Q: What technical documents can you provide?
A: Depending on the material, we can provide ISO, TDS, RoHS, REACH, SGS reports and relevant IEC or UL information for technical evaluation and supplier approval.
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