STK Tape supplies authentic 3M 44, 3M 44D-A, 3M 44T-A, and 3M 55, an advanced portfolio of Polyester Web/Polyester Film Composite Tape solutions engineered specifically for high-reliability electrical equipment manufacturing. Combining a tough polyester film core with an open non-woven polyester web layer and an aggressive Thermosetting Rubber Adhesive, this product line delivers extraordinary edge tear resistance, high Puncture Resistance, and outstanding Varnish Absorption during electrical impregnation processes.
Formulated as the definitive choice for Tear Resistant & Transformer Margin Tape requirements, this series provides stable Class B 130°C Insulation and prevents wire slippage during high-speed coil winding operations.
Performance Features
Superior Edge Tear & Puncture Resistance: Built with a composite web/film matrix that resists physical tearing, cut-through, and corner puncture under heavy wire tension.
Enhanced Varnish Absorption & Retention: The non-woven web surface absorbs electrical insulating varnishes and resins, bonding firmly with encapsulants to eliminate air voids and moisture pockets.
Thermosetting Adhesive System: Features a pressure-sensitive Thermosetting Rubber Adhesive that cures under thermal processing (e.g., 1 hour @ 150°C) to maximize holding power and solvent resistance.
High Dielectric Isolation: Delivers a reliable Dielectric Breakdown Voltage of up to 6,000 Volts to safeguard coil margins, primary-secondary boundaries, and lead wire connections.
TDS
|
Technical Metric |
3M Tape 44 |
3M Tape 44D-A |
3M Tape 44T-A |
3M Tape 55 |
Testing Standard / Condition |
|
Product Category |
Polyester Web/Polyester Film Composite Tape |
Polyester Web/Polyester Film Composite Tape |
Polyester Web/Polyester Film Composite Tape |
Polyester Web/Polyester Film Composite Tape |
Official 3M Designation |
|
Backing Structure |
Polyester Film / Web |
Double Polyester Web / Film |
Thin Polyester Film / Web |
Heavy Polyester Film / Web |
Composite Construction |
|
Adhesive Matrix Type |
Thermosetting Rubber Adhesive |
Thermosetting Rubber Adhesive |
Thermosetting Rubber Adhesive |
Thermosetting Rubber Adhesive |
Pressure-sensitive rubber |
|
Total Tape Thickness |
5.5 mil (0.140 mm) |
7.5 mil (0.190 mm) |
3.2 mil (0.081 mm) |
7.5 mil (0.191 mm) |
ASTM D1000 |
|
Thermal Rating Class |
Class B 130°C Insulation |
Class B 130°C Insulation |
Class B 130°C Insulation |
Class B 130°C Insulation |
Continuous operating spec |
|
Tensile Strength |
40 lbs/in (70 N/10 mm) |
40 lbs/in (70 N/10 mm) |
25 lbs/in (44 N/10 mm) |
40 lbs/in (70 N/10 mm) |
ASTM D1000 |
|
Dielectric Breakdown Voltage |
5,500 V |
6,000 V |
4,000 V |
6,000 V |
ASTM D1000 |
|
Peel Adhesion to Steel |
65 oz/in (7.1 N/10 mm) |
65 oz/in (7.1 N/10 mm) |
50 oz/in (5.5 N/10 mm) |
65 oz/in (7.1 N/10 mm) |
ASTM D1000 |
|
Elongation at Break |
50% |
50% |
50% |
50% |
ASTM D1000 |
|
Varnish Absorption Grade |
Excellent |
Superior |
Good |
Superior |
Varnish retention quality |
|
Primary Design Focus |
Tear Resistant & Transformer Margin Tape |
Tear Resistant & Transformer Margin Tape |
Tear Resistant & Transformer Margin Tape |
Tear Resistant & Transformer Margin Tape |
Edge barrier application |
Applications
3M 44 & 3M 44D-A Applications (Standard & Heavy Composite)
Transformer Coil Margin Sealing: Creating secure edge barriers and margin borders on stick-wound transformer coils to prevent wire slip-off during high-speed automated winding.
Coil Outer Wrap & Layer Insulation: Outer layer protection and inter-layer separation in power distribution transformers and inductors requiring high Varnish Absorption.
3M 44T-A Applications (Thin Composite)
Compact Coil Margin Barriers: Space-saving edge margin insulation on low-profile transformers and fine-wire relay coils where overall tape thickness must be minimized.
3M 55 Applications (High Cushion Composite)
Heavy-Duty Margin Padding: Cushioning and margin containment for heavy-gauge rectangular wire coils and high-vibration electric motor slot edges.
Precision Log Slitting: Processing original 3M jumbo master rolls into custom narrow or wide log roll widths with clean, fuzz-free edge profiles through Precision Log Slitting.
Cleanroom Precision Die-Cutting: Stamping original 3M 44, 3M 44D-A, 3M 44T-A, and 3M 55 into custom coil margin strips, washers, and slot liners via Cleanroom Precision Die-Cutting.
Reliable B2B Direct Inventory: Maintaining continuous factory inventory to support steady OEM transformer, electric motor, and coil winding operations globally.
Our factory & Equipment
Custom Adhesive Tape Solutions
We provide comprehensive adhesive tape customization and converting services, including custom thickness, size, core, packaging, release liners, and die-cutting solutions to meet your specific application requirements.
Custom Thickness
Custom thickness of adhesive tape is available according to customer's request.
Custom Size
Custom width/length of adhesive tape is available according to customer's request.
Custom Core
Custom core diameter of adhesive tape is available according to customer's request.
Custom Package
Custom package of adhesive tape is available according to customer's request.
Custom liner
Adhesive tape with release liner is available according to customer's request.
Die-cut Service
Die-cutting of adhesive tape is available according to customer's request.
Manufacturing & Delivery Process
Coating Adhesive
Rewinding Roll
Cutting Roll
Quality Inspection
Roll Packing
Delivery
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