Applications
Where our insulation goes
Oil-immersed and dry-type transformers, motors and generators, reactors, instrument transformers and switchgear. Find the material by the position it insulates.
Application 01
Oil-Immersed Transformers
Turn, layer, lead and structural insulation for power and distribution transformers under transformer oil.
Inside an oil-immersed transformer the insulation must be oil-compatible, dimensionally stable through the drying and vacuum cycles, and mechanically strong enough to keep the winding clamped for decades. We supply kraft paper and dotted papers for the winding, pressboard for end and layer insulation, crepe paper tubes for tap leads and glass-fibre stays and resin cushions for the structural supports.
Insulation positions covered
- Turn-to-turn and layer insulation
- HV/LV interlayer insulation
- Coil end and lead insulation
- Coil clamping and structural support
- Tap lead insulation
Recommended materials
Application 02
Dry-Type Transformers
Cast-resin and open-type dry-type transformer insulation, from layer insulation to coil reinforcement.
Cast-resin dry-type transformers need insulation that bonds into the cured coil, not just sits between layers. Prepreg DMD and SHS prepreg reflow during impregnation; epoxy prepreg netting reinforces the coil; PET composite cowl carries inter-coil and end insulation without the mass of a rigid board.
Insulation positions covered
- Layer insulation in cast-resin coils
- HV-LV inter-coil and end insulation
- Ground and end-seal insulation
- Coil reinforcement
- Structural insulation boards
Recommended materials
Application 03
Electric Motors & Generators
Slot, phase, turn, wiring and binding insulation for Class B, F and H rotating machines.
A motor insulation system is only as good as its weakest interface: slot liner, phase separator, sleeve, binding tape and varnish all have to work at the same temperature class. We supply DMD, NMN, NHN and AMA for the slots, coated sleevings for the leads, cotton / polyester / fiberglass tapes for binding, and Class B, F and H varnishes for impregnation.
Insulation positions covered
- Slot, phase and turn insulation
- Class F / H slot liners and wedges
- Lead wire sleeving and protection
- Coil binding and tightening
- VPI, dip and trickle impregnation
Recommended materials
Application 04
Reactors
Coil reinforcement, support insulation and high-temperature materials for reactors.
Reactor coils run hot and see high mechanical forces. Glass-fibre netting cures into the coil to control cracking, pultruded stays and resin cushions hold the structure, and Class H materials take the temperature duty without compromising dielectric performance.
Insulation positions covered
- Coil reinforcement insulation
- Support and spacer blocks
- Coil stays
- Structural insulation parts
- Class H impregnation
Recommended materials
Application 05
Instrument Transformers
Turn insulation and HV field grading for voltage and current transformers.
Instrument transformers are where dielectric consistency matters most: thin, uniform turn insulation and stable semi-conductive shielding. DDM dotted Mylar is the standard for voltage-transformer turn insulation; semi-conductive crepe paper keeps the field distribution stable at electrodes and conductor edges.
Insulation positions covered
- Turn insulation in voltage transformers
- HV shielding and field grading
- Layer insulation
- Wrapping of magnet wire and leads
Recommended materials
Application 06
Switchgear & Electrical Equipment
Barriers, mounting boards, machined parts and wiring protection for switchgear and electrical equipment.
Switchgear needs laminates that hold their mechanical and arc-resistant properties in service: 3240 and FR-4 (UL94 V-0) for barriers and mounting boards, GPO-3 / SMC / DMC machined to drawing, and sleeving and film for internal wiring.
Insulation positions covered
- Barriers and arc chutes
- Mounting boards and fixtures
- Machined insulation parts
- Internal wiring protection
- Shielding and wrapping
Recommended materials
Selection index
Find the material by application
A quick reference. Final selection still depends on voltage class, insulation design, process and validation requirements.
| Application | Recommended products |
|---|---|
| Oil-immersed transformer: turn / layer | DDP, Craft Paper, Diamond Dotted AMA, Crepe Paper |
| Oil-immersed transformer: end / structure | Pressboard, Pultruded Stays, Silicone Cushion, Crepe Paper Tube |
| Dry-type / cast-resin transformer | Prepreg DMD, PET Composite Cowl, Epoxy Netting, SHS Prepreg, 3240, FR-4 |
| Motor: slot / phase / turn | DMD-F, NMN, NHN, AMA, Polyester Film 6020 |
| Motor: binding | Cotton Tape, Heat-Shrinking Tape, Fiberglass Tape |
| Motor: wiring / protection | 2715, 2740, 2753 |
| Impregnation | 1038, 1040, 1042, 1140, 1153, 1053 |
| Instrument transformer / HV shielding | DDM, DDP, Semi-Conductive Crepe, Crepe Paper |
| Custom machining | Insulated Workpiece, Silicone Cushion |