STK Tape supplies authentic 3M 46, 3M 1339, and 3M 1276, an elite family of Filament Reinforced Polyester Tape materials engineered specifically for high-stress electromechanical restraint and heavy transformer coil construction. Formulated by embedding continuous longitudinal glass strands into a tough polyester film (Glass Filament Backing) and coating it with a high-tack Thermosetting Rubber Adhesive, these industrial electrical tapes offer exceptional structural stability and burst resistance.
Designed to resist severe physical vibration, rotational torque, and thermal expansion, this product series is the definitive solution for Heavy Duty High Tensile Tie-down requirements across heavy electrical machinery manufacturing. Rated for continuous Class B 130°C Insulation, 3M 46 (7.0 mil / 0.177 mm) delivers flagging resistance and electrical stability. 3M 1339 (6.5 mil / 0.165 mm) packs high cut-through toughness into a slim profile, while 3M 1276 (9.0 mil / 0.228 mm) provides maximum structural fortitude with a 300 lbs/in rating for extreme load restraint.
Performance Features
Immense Longitudinal Reinforcement:
Engineered with continuous glass yarn strands to achieve high Tensile Strength up to 300 lbs/in (525 N/10 mm), preventing tearing or snap failures under intense mechanical torque.
Thermosetting Adhesive Matrix:
Utilizes a pressure-sensitive Thermosetting Rubber Adhesive that crosslinks under heat cycles (e.g. 1 hour @ 150°C) to resist varnish solvents, eliminating edge lifting and adhesive degradation.
Ultra-Low Stretch Retention:
Maintains a low Elongation at Break of just 5%, ensuring rigid positional holding, zero slippage, and permanent tension retention during Heavy Duty Bundle Bundling.
High Dielectric Isolation:
Provides a robust Dielectric Breakdown Voltage of up to 6,000 Volts alongside high cut-through defense to safeguard primary windings and lead wires against electrical short-circuiting
TDS
|
Technical Metric |
3M Filament Tape 46 |
3M Filament Tape 1339 |
3M Filament Tape 1276 |
Testing Standard / Condition |
|
Product Category |
Filament Reinforced Polyester Tape |
Filament Reinforced Polyester Tape |
Filament Reinforced Polyester Tape |
Official 3M Designation |
|
Backing Structure |
Glass Filament Backing + PET Film |
Glass Filament Backing + PET Film |
Glass Filament Backing + PET Film |
Continuous glass yarns |
|
Total Tape Thickness |
7.0 mil (0.177 mm) |
6.5 mil (0.165 mm) |
9.0 mil (0.228 mm) |
ASTM D1000 |
|
Adhesive System Type |
Thermosetting Rubber Adhesive |
Thermosetting Rubber Adhesive |
Thermosetting Rubber Adhesive |
Pressure-sensitive rubber |
|
Thermal Rating / Class |
Class B 130°C Insulation (266°F) |
Class B 130°C Insulation (266°F) |
Class B 130°C Insulation (266°F) |
Continuous operating spec |
|
Dielectric Breakdown Voltage |
5,500 V |
5,500 V |
6,000 V |
ASTM D1000 |
|
Breaking / Tensile Strength |
275 lbs/in (481 N/10 mm) |
275 lbs/in (481 N/10 mm) |
300 lbs/in (525 N/10 mm) |
ASTM D1000 |
|
Peel Adhesion to Steel |
50 oz/in (5.5 N/10 mm) |
50 oz/in (5.5 N/10 mm) |
50 oz/in (5.5 N/10 mm) |
ASTM D1000 |
|
Elongation at Break |
5% |
5% |
5% |
ASTM D1000 |
|
Insulation Resistance |
> 1,000,000 MΩ (> 1 × 10⁶) |
> 1,000,000 MΩ (> 1 × 10⁶) |
> 1,000,000 MΩ (> 1 × 10⁶) |
ASTM D1000 |
|
Safety Compliance |
UL Recognized / Flame Retardant |
UL Recognized / Flame Retardant |
UL Recognized / Flame Retardant |
UL File E17385 |
Applications
3M 46, 1339 & 1276 Targeted Applications
Transformer Core Anchoring: Securing heavy magnetic core laminations, primary winding layers, and coil end-turns in power and distribution transformers requiring Transformer Core Anchoring.
Motor Lead & Armature Tie-Down: Executing Heavy Duty High Tensile Tie-down for heavy motor stator coils, armature end-turns, and internal lead wire bundles against centrifugal stress.
Heavy Duty Bundle Bundling: Strapping heavy electrical cable harnesses, oil-filled inductive components, and reactor coils prior to resin impregnation.
High Impact Shearing & Cut-Through Protection: Shielding sharp-edged conductor bars and metallic frames from mechanical abrasion and puncture damage during coil winding.
STK Custom Conversion & Material Supply Services
STK Tape converts authentic 3M master rolls into exact formats for your assembly line
Precision Log Slitting:
Processing original 3M jumbo master rolls into custom narrow or wide roll widths with clean, fiber-free edge finishes through Precision Log Slitting.
Cleanroom Precision Die-Cutting:
Stamping original 3M 46, 3M 1339, and 3M 1276 into custom structural straps, insulation collars, and precut pads via Cleanroom Precision Die-Cutting.
Reliable B2B Direct Inventory:
Maintaining continuous factory inventory to support steady OEM transformer, electric motor, and heavy apparatus manufacturing worldwide.
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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