OKABE MICA CO.,LTD.

JapaneseChinese

We specialize in heat-resistant insulators and fire-resistant insulants.

Mica tape for Coil Insulation

Dry mica tape and prepreg mica tape

(1) Dry mica tape

Dry mica tape is made of mica paper and reinforcements bonded with small amount of epoxy adhesive. It has good resin impregnation properties, and most suited to building an insulation system by Vacuum Pressure Impregnation (VPI) method for high-voltage coils.

(2) Prepreg mica tape

Prepreg mica tape is made of mica paper and glass cloths bonded with epoxy adhesive. Its main feature is that epoxy adhesive is semi-cured (B stage), and it allows for building an insulation system just by heat press after winding the coil.

Characteristics

  1. (1) Dry mica tape has excellent impregnation properties.
  2. (2) Prepreg mica tape can be shaped (integrated) by just using heat press.
  3. (3) Highly flexible and easy to wind, which provides good adhesion with coils.
  4. (4) Excellent electrical insulation properties including corona resistance.
  5. (5) Excellent heat resistance, which also allows for use in high heat resistance classification (former F class and H class, etc).

Use

  1. (1) Insulation for power generators, electrical motors, or various types of high-voltage coils
  2. (2) Insulation between slot cells and coils
  3. (3) Insulation between layers of high-voltage equipment

Composition and standard dimensions of dry mica tape

Item DL86-4C DG86-TD1
Mica Mica paper based on uncalcinde muscovite
Adhesive Epoxy
Reinforcement Polyester film Glass cloth
Standard
dimensions
Thickness
(mm)
0.13 0.15 0.18 0.13 0.18
Width (mm) ≧10
Length(m) 30 or 50 (Negotiable)

Properties of dry mica tape

Item Unit DL86-4C DG86-TD1
Nominal thickness mm 0.13 0.15 0.18 0.13 0.18
Tensile strength N/10mm wide 46 46 48 80 107
Binder content wt% ≦10 ≦10
Breakdown voltage kV 7.5 8.6 9.1 2.2 3.4

Composition and standard dimensions of prepreg mica tape

Item DG86-TP1 DG86-3
Mica Hard non-calcined mica paper Hard calcined mica paper
Adhesive Epoxy
Reinforcement Glass cloth
Standard dimensions Thickness
(mm)
0.18
Width (mm) ≧10
Length(m)

30 or 50 (Negotiable)

Properties of prepreg mica tape

Item Unit DG86-TP1 DG86-3
Nominal thickness mm 0.18 0.18
Tensile strength N/10mm wide 89 133
Binder content wt% ≦50 ≦50
Breakdown voltage kV 6.0 6.0
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