3M 8402 High Temperature Polyester Tape | Green Silicone Adhesive Tape

Benefits

• Supports reliable splicing of silicone-treated release liners, papers, and films.

• Helps maintain masking integrity during suitable high-temperature processes.

• Reduces the risk of tape tearing during removal when applied correctly.

• Helps minimize adhesive residue on compatible surfaces.

• Protects metal components from scratches during handling and shipping.

• Provides visible identification of spliced or masked areas.

• Supports demanding composite bonding and metal finishing workflows.

Technical Specifications

Property	Typical specification
Product name	3M™ Polyester Tape 8402
Backing material	Polyester film
Adhesive type	Silicone
Color	Green, translucent
Backing thickness	Approximately 0.02 mm
Total tape thickness	Approximately 0.05 mm
Adhesion to steel	Approximately 25 N/100 mm
Tensile strength at break	Approximately 438 N/100 mm
Elongation at break	Approximately 125%
Temperature range	-50°C to 218°C, depending on the test and application
Autoclave performance	Retains flexibility under specified conditions up to 177°C
Release liner	No liner
Standard roll length	Approximately 66 m; other formats may be available
Available widths	Multiple widths, depending on product configuration
Product format	Roll

Note: Values are typical reference data from 3M technical documentation, not guaranteed specifications. Temperature ratings depend on exposure duration and test conditions. Confirm the applicable regional TDS and product configuration before using these values for engineering or purchasing decisions.

Applications

• Splicing silicone-coated release liners

• Splicing silicone-treated papers and films

• Holding bagging materials during composite bonding

• Holding vacuum bags and parts during composite processing

• Masking metal surfaces during anodizing

• Masking during selected chemical milling or etching processes

• Flash breaking in metal bonding operations

• High-temperature paint masking

• Temporary surface protection during handling and shipping

• Industrial masking in demanding thermal environments

Compatible Materials

• Silicone-coated release liners

• Silicone-treated paper

• Silicone-treated films

• Stainless steel

• Aluminum and selected metal surfaces

• Composite processing materials

• Selected industrial tooling and fixtures

Compatibility depends on the substrate, surface condition, temperature, chemical exposure, and dwell time. Testing on the actual materials and process is recommended.

Industries

• Aerospace and aviation

• Automotive manufacturing

• Appliance manufacturing

• Electronics manufacturing

• Composite manufacturing

• Metal fabrication and finishing

• Printing and paper converting

• Construction and transportation

• Industrial equipment manufacturing

• General industrial manufacturing

Why Choose 3M 8402 Polyester Tape?

3M 8402 combines a thin polyester backing with silicone adhesive to support high-temperature masking and applications involving silicone-treated materials. Its green translucent backing improves visibility during splicing and process inspection.

Compared with thicker polyester tapes, its thin construction is useful where flexibility and a low-profile bond line are important. It is particularly suitable for silicone liner splicing, composite processing, and selected metal finishing operations.

Yousan can help customers assess adhesive tape requirements and discuss sourcing, slit-width options, and converting possibilities, subject to product availability and technical review.

Installation Guide

1. Prepare the surface: Ensure the surface is clean, dry, and free from oil, dust, and other contaminants.

2. Check compatibility: Test adhesion and removal on the intended substrate, especially silicone-treated materials.

3. Position the tape: Align the tape carefully along the required splice or masking boundary.

4. Apply consistent pressure: Press the tape down evenly to achieve good contact and avoid wrinkles or trapped air.

5. Verify process conditions: Confirm that temperature, exposure time, and chemical conditions are suitable for the application.

6. Remove when required: Follow the validated process instructions and remove the tape steadily to minimize tearing or residue.

Storage

• Store in a clean, dry environment.

• Keep away from direct sunlight and excessive heat or humidity.

• Retain the tape in its original packaging until use.

• Protect the adhesive surface from dust, oil, and other contaminants.

• Follow the storage conditions and shelf-life guidance in the applicable 3M documentation.

FAQ

Q1: What is 3M 8402 polyester tape used for?
It is used for silicone-coated liner splicing, composite bonding operations, high-temperature masking, anodizing, selected chemical milling processes, and temporary surface protection.

Q2: What color is 3M 8402 tape?
It has a green translucent polyester backing that makes taped and spliced areas easy to identify.

Q3: What adhesive does 3M 8402 use?
It uses silicone adhesive, which supports heat-resistant applications and adhesion to selected silicone-treated surfaces.

Q4: What is the thickness of 3M 8402?
The total tape thickness is approximately 0.05 mm, including a polyester backing of approximately 0.02 mm.

Q5: What temperature can 3M 8402 withstand?
3M lists performance across a broad temperature range, with specified autoclave flexibility up to 177°C and adhesive performance described up to 218°C under applicable conditions. These figures should not be interpreted as a guarantee for every exposure duration or process.

Q6: Can 3M 8402 adhere to silicone-coated release paper?
Yes. It is designed for splicing applications involving silicone-treated papers and films. Confirm performance with the specific liner and production conditions.

Q7: Is 3M 8402 suitable for anodizing?
It is used for masking metal surfaces in selected anodizing processes. Confirm compatibility with the specific bath chemistry, temperature, and exposure time before use.

Q8: Can 3M 8402 be used in composite manufacturing?
Yes. Typical applications include holding bagging materials, vacuum bags, and parts during composite bonding operations, subject to process validation.

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Downloads

Available upon request:

• 3M 8402 Polyester Tape Technical Data Sheet (TDS)
• Safety Data Sheet (SDS)
• Adhesive Tape Selection Guide
• Product Brochure
• Die-Cutting Capability Guide

Please contact our sales team if you require the latest technical documentation.