MOPP Fixing Tape
MOPP Fixing Tape — High-Temperature Monoaxially Oriented Polypropylene Insulation Tape
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Product Introduction
MOPP (Monoaxially Oriented Polypropylene) Fixing Tape is a high-performance single-coated pressure-sensitive adhesive tape engineered for electrical insulation and mechanical fixation in transformers, motors, coils, and lithium battery packs. The backing film - a uniaxially stretched polypropylene - delivers exceptional tensile strength in the machine direction while maintaining a thin, conformable profile ideal for wrapping irregular surfaces.
Coated with a high-temperature solvent-based acrylic or rubber-based adhesive system, the tape bonds securely to copper windings, steel laminations, and engineering plastics. It withstands continuous operating temperatures up to 130°C (standard grade) and 150°C (high-temperature grade), with short-term peak resistance exceeding 180°C during varnish curing or impregnation processes.
Key performance characteristics:
Dielectric strength ≥ 40 kV/mm - meets IEC 60664-1 requirements for reinforced insulation
Flame retardancy UL94 VTM-0 available for applications requiring self-extinguishing behavior
Solvent resistance - withstands transformer oil, varnish, and common industrial cleaning agents
Clean removability - peels off without adhesive residue on copper or steel substrates after thermal cycling
Low moisture absorption ≤ 0.03% - maintains electrical integrity in humid environments
Typical applications include interlayer insulation and end-taping of transformer windings, coil lead fixation, slot liner retention in motor stators, and cell-to-cell insulation in prismatic battery modules.
| Property | Specification |
|---|---|
| Backing Material | Monoaxially Oriented Polypropylene (MOPP) film |
| Adhesive Type | High-temperature acrylic / rubber-based (solvent-based) |
| Tape Width | 5 mm – 50 mm (custom widths available) |
| Tape Thickness | 0.03 mm – 0.15 mm |
| Standard Length per Roll | 33 m / 66 m / 100 m (custom lengths available) |
| Color | Transparent, Yellow, White, or custom-matched |
| Core Diameter | 25 mm (1") / 38 mm (1.5") / 76 mm (3") |
| Operating Temperature | -40°C to +130°C (standard) / -40°C to +150°C (high-temp grade) |
| Dielectric Strength | ≥ 40 kV/mm (IEC 60243) |
| Tensile Strength (MD) | ≥ 60 N/cm |
| Elongation at Break (MD) | 25% – 60% |
| Adhesion to Steel | ≥ 1.5 N/cm (180° peel, ASTM D3330) |
| Flame Retardancy | UL94 VTM-0 (optional, upon request) |
| Moisture Absorption | ≤ 0.03% (24h immersion) |
| Certifications | UL, IEC 60454-3, RoHS, REACH |
Why Choose Our MOPP Fixing Tape
Proprietary Adhesive Formulation Our in-house developed acrylic and rubber-based adhesive systems are optimized for the specific surface energy of copper windings and electrical steel. Unlike generic commodity tapes, our formulation maintains peel strength after repeated thermal cycling from -40°C to +150°C - a critical requirement in transformer and motor applications where bond failure is not an option.
Precision Slitting and Winding All rolls are slit on CNC-controlled slitting lines with ±0.1 mm width tolerance and tension-controlled winding to eliminate telescoping, edge burrs, and adhesive ooze. This ensures smooth, consistent unwinding on automated taping machines and manual assembly lines alike.
Application Scenarios
| Application | Industry | Key Requirement |
|---|---|---|
| Transformer winding interlayer insulation | Power distribution | High dielectric strength, thermal class F/H |
| Motor coil lead fixation & end-taping | Industrial motors | Solvent resistance, clean removability |
| Lithium battery cell wrapping & insulation | Energy storage / EV | Flame retardancy (VTM-0), electrolyte resistance |
| Slot liner retention in stator cores | Motor manufacturing | Thin gauge, high MD tensile strength |
| Bobbin / coil former outer wrap | Electronics / relay coils | Conformability, residue-free removal |
our customer
certification
International certification
IEC certification: complies with international electrical equipment standards
ISO 9001 quality management system certification
UL certification: Complies with US UL certification to ensure product safety and quality.
FAQ
Q: What is the difference between MOPP tape and PET tape for transformer insulation? MOPP (Monoaxially Oriented Polypropylene) offers higher tensile strength in the machine direction and better conformability than PET (polyester) at comparable thicknesses. MOPP is preferred for applications requiring tight wrapping around irregular coil geometries, while PET is typically used where dimensional stability and higher temperature ratings (Class F/155°C and above) are required.
Q: Can you supply MOPP tape with flame retardant certification? Yes. We offer UL94 VTM-0 certified MOPP tape grades. This is particularly relevant for lithium battery insulation and applications where fire safety standards mandate self-extinguishing materials. Certification documentation is provided with each shipment.
Q: Do you offer custom widths and lengths? Yes. Standard widths range from 5 mm to 50 mm, and we can slit to any custom width within this range at no additional tooling charge for volumes above 1,000 rolls. Custom roll lengths (beyond the standard 33 m, 66 m, and 100 m options) are also available.
Q: What is the shelf life of MOPP fixing tape? 12 months from the date of manufacture when stored in original packaging at 20°C ± 5°C and 50% ± 10% relative humidity, away from direct sunlight and UV exposure.
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