3B Linered 3 mil Polyimide Film Tape with Silicone Adhesive with Liner

TapeCase

3B Linered 3 mil Polyimide Tape with Silicone Adhesive with Liner

3B Linered

TapeCase 3B Linered is a 3 mil polyimide backing with a high temperature silicone adhesive and a PET liner, providing excellent electrical insulation, mechanical strength, and thermal resistance up to 500°F. Thin and conformable, it delivers reliable adhesion, clean removal, and dependable performance for high temperature masking and electrical insulation applications.

Excellent thermal resistance and electrical insulating properties
High dielectric strength and chemical resistance
Wide operating temperature range up to 500°F

Color: Amber

Liner Material: PET Film

Backing/Carrier Material: Polyimide Film

Adhesive Type: Silicone

TotalThickness: 4.5 mil

Overview
Customize
Features
Specifications
Compliance
Resources

Overview

Consult

Specify a finalized design or create a new one from scratch with our experienced converting experts.

Design

Pair our material sampling library with our precision converting capabilities to optimize and validate a prototype.

Produce

Rely on our top-tier suppliers, strict quality controls, and hands-on help to ensure your product's effectiveness throughout its lifecycle.

Customize

Customize This Material

Our wide range of converting capabilities allow us to take this material and transform it into the right width, length, shape or fabricated part to not only achieve ideal integration into your end use, but also optimize how you apply the material in your application. Our converting equipment paired with our expert engineering team will help you create the exact custom solution for your unique requirements.

To learn more about the most common converting services we offer, or to contact our team to start discussing your solution, please utilize the below links:

Tape Slitting

Die-Cutting

Custom Part Fabrication

Prototyping

Custom Length Rolls

Features

Excellent thermal resistance and electrical insulating properties
High dielectric strength and chemical resistance
Wide operating temperature range up to 500°F
Removes cleanly without adhesive residue after exposure to heat and chemicals
Excellent abrasion, puncture, and tear resistance
Thin and conformable enabling masking of uneven surfaces
Includes a PET liner for die-cutting and easy handling
MIL- P - 461112B / ASTM D 5213, Type 1 Item A

Specifications

Color	Amber
Backing/Carrier Material	Polyimide Film
Adhesive Type	Silicone
Total Thickness	4.5 mil
Backing/Carrier Thickness	3 mil
Adhesive Thickness	1.5 mil
Liner Material	PET Film
Liner Thickness	3 mil
Adhesive Strength	25 oz/in
Tensile Strength	80 lb/in
Elongation	60%
Dielectric Strength	15,000 volts
Minimum Temperature Performance	-100°F
Maximum Temperature Performance	500°F

Compliance

We value the importance of up to date an accurate regulatory information on the products we work with. For the most current Compliance and Regulatory information on your product of interest, please contact our experts for assistance.

Resources

Technical Data Sheet

TapeCase Polyimide Tape 3B Linered features a 3 mil polyimide backing coated with a high temperature silicone adhesive with a PET liner designed for demanding masking and insulating applications. It provides excellent mechanical and electrical properties, along with dimensional stability in harsh environments. The polyimide backing is thin and highly conformable while offering strong resistance to cut through, impact, and abrasion. Engineered to withstand temperatures up to 500°F (260°C), Polyimide Tape 3B Linered maintains reliable adhesion and removes cleanly after exposure to heat and chemicals. Common applications include high temperature protection of PCB gold fingers during wave solder or solder dip processes, thermal shielding of sensitive components, and high temperature electrical insulation for coils, capacitors, transformers, battery pack leads, and magnet wire. It is widely used in the electrical, automotive, and aerospace industries where dependable performance is critical. The 3B Linered series meets MIL- P - 461112B / ASTM D 5213, Type 1 Item A.

Masking of PCB gold fingers during wave solder or solder dip processes
Electrical insulation for coils, capacitors, transformers, battery pack leads, and magnet wire
Insulation of wires, switches, diaphragms, sensors, and heated coil components
Protection of fragile electronic components