Mica Tape HT Winding with Accelerator
Mica Tape HT Winding with Accelerator is a flexible woven glass fabric tape impregnated with muscovite mica paper and containing an accelerator, produced to a nominal thickness of 0.15 ± 0.03 mm. It is designed for main wall insulation of vacuum pressure impregnated (VPI) high voltage motor coils and is suitable for thermal class F (155°C) electrical insulation systems. The tape is primarily formulated for use with epoxy-anhydride VPI resin systems.
Key Properties
- Thickness: 0.15 ± 0.03 mm (IEC 60371-2)
- Mica Paper Weight: 160 ± 10 g/m² (IEC 60371-2)
- Glass Fabric Weight: 23 ± 2 g/m² (IEC 60371-2)
- Resin Content: 17 ± 3 g/m² (IEC 60371-2)
- Thermal Class: F (155°C) (IEC 60085)
- Breakdown Voltage: ≥1.5 kV (IEC 60371-2)
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Thickness | 0.15 ± 0.03 mm (0.0059 ± 0.0012 in) | IEC 60371-2 |
| Glass Fabric Weight | 23 ± 2 g/m² (0.68 ± 0.06 oz/yd²) | IEC 60371-2 |
| Mica Paper Weight | 160 ± 10 g/m² (4.72 ± 0.30 oz/yd²) | IEC 60371-2 |
| Total Weight | 200 ± 15 g/m² (5.90 ± 0.44 oz/yd²) | IEC 60371-2 |
| Resin Content | 17 ± 3 g/m² (0.50 ± 0.09 oz/yd²) | IEC 60371-2 |
| Accelerator Content | 480 ± 120 mg/m² (0.0142 ± 0.0035 oz/yd²) | — |
| Porosity | ≤800 s/100ml | ISO 5636/5 |
| Min. Shelf Life at 20°C (68°F) | 12 months | — |
| Min. Shelf Life at 5°C (41°F) | 24 months | — |
Mechanical Properties
| Property | Value | Test Method |
| Tensile Strength | ≥80 N/cm (≥45.7 lbf/in) | IEC 60371-2 |
| Stiffness | ≤75 N/m (≤0.428 lbf/in) | IEC 60371-2 |
Thermal Properties
| Property | Value | Test Method |
| Thermal Class | F (155°C / 311°F) | IEC 60085 |
Electrical Properties
| Property | Value | Test Method |
| Breakdown Voltage | ≥1.5 kV | IEC 60371-2 |
Compliance
- IEC 60371-2 — Compliant
- IEC 60085 — Compliant (Thermal Class F, 155°C)
- ISO 5636/5 — Compliant
- Main wall insulation for high voltage motor coils
- Slot insulation for VPI (vacuum pressure impregnated) windings
- End winding insulation for VPI motor coils
- Coil insulation for use with epoxy-anhydride VPI resin systems
- Thermal Class F electrical insulation systems for rotating machines
Common industries: Electric motor and generator manufacturing, high voltage rotating machinery, industrial electrical equipment production.
Mica Tape HT Winding with Accelerator is a mica winding tape built on a woven glass fabric substrate impregnated with muscovite mica paper. The addition of an accelerator supports rapid, full impregnation during vacuum pressure impregnation (VPI) processing. The tape is intended for slot and end winding insulation of coils in high voltage motors and is primarily designed for use with an epoxy-anhydride VPI resin — the final thermal, electrical, and mechanical properties of the finished insulation system are determined by the properties of the selected VPI resin.
The tape is flexible, supporting rapid coil manufacture, and exhibits very good impregnability with a porosity rating of ≤800 s/100ml. Recommended processing is a half-lapped tape application, with cure cycle determined by the VPI resin selected; optimal results are noted when used together with Damisol® 3407 resin and Epoflex® 324.03 protection tape. Minimum shelf life is 12 months at 20°C or 24 months at 5°C. Compliant with IEC 60371-2, ISO 5636/5, and IEC 60085.
What differentiates Mica Tape HT Winding with Accelerator from other mica winding tapes?
Mica Tape HT Winding with Accelerator contains an accelerator that supports rapid, full impregnation during VPI processing while remaining flexible enough for easy coil manufacture. Combined with an epoxy-anhydride VPI resin, it delivers very good impregnability and is rated for thermal class F (155°C) electrical insulation systems.
Why is breakdown voltage critical for this mica winding tape insulation?
As the main wall insulation for high voltage motor coils, the tape's dielectric integrity directly determines the winding's resistance to electrical breakdown in service. Mica Tape HT Winding with Accelerator is rated ≥1.5 kV breakdown voltage per IEC 60371-2, supporting reliable performance once combined with the selected VPI resin system.
What is the thermal service rating for Mica Tape HT Winding with Accelerator?
Mica Tape HT Winding with Accelerator is rated Thermal Class F (155°C / 311°F) per IEC 60085. The final thermal, electrical, and mechanical properties of the completed insulation system are determined by the properties of the VPI resin used together with the tape.
Is Mica Tape HT Winding with Accelerator suitable for high voltage insulation systems requiring recognized thermal classification?
Yes. Mica Tape HT Winding with Accelerator is rated Thermal Class F per IEC 60085 and is tested to IEC 60371-2 and ISO 5636/5, the recognized standards for mica paper-based flexible insulating materials.
How should Mica Tape HT Winding with Accelerator be specified?
Specify grade (Mica Tape HT Winding with Accelerator), thickness, tape width, thermal class requirement, VPI resin compatibility, and finished roll/core format.
