3M

3M 4646 VHB Tape

3M™ VHB™ Tape 4646 is a 25 mil thick firm double sided foam tape. This product is specially engineered for use on metal substrates and resistance to high heat. Possible applications include bonding onto substrates prior to high temperature paint processes. Constructed with firm foam, this tape provides the maximum tape strength in the VHB family.

Fast and easy-to-use permanent bonding method provides high strength and long-term durability
Can replace mechanical fasteners (rivets, welds, screws) or liquid adhesives
High temperature capability, often suitable for bonding prior to high temperature paint processing

Unwind Side Adhesive Type: General Purpose Acrylic

Liner Side Adhesive Type: General Purpose Acrylic

Color: Dark Gray

Liner Material: Red PE Film

Backing/Carrier Material: Firm Acrylic Foam (Closed Cell)

TotalThickness: 25 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

Fast and easy-to-use permanent bonding method provides high strength and long-term durability
Can replace mechanical fasteners (rivets, welds, screws) or liquid adhesives
High temperature capability, often suitable for bonding prior to high temperature paint processing
Virtually invisible fastening keeps surfaces smooth
Eliminates drilling, grinding, refinishing, screwing, welding and associated clean-up
Creates a permanent seal against water, moisture and other environmental elements
Allows the use of thinner, lighter weight and dissimilar materials
Pressure sensitive adhesive bonds on contact to provide immediate handling strength

Specifications

Color	Dark Gray
Backing/Carrier Material	Firm Acrylic Foam (Closed Cell)
Unwind Side Adhesive Type	General Purpose Acrylic
Liner Side Adhesive Type	General Purpose Acrylic
Total Thickness	25 mil
Density	52 lb/ft³
Liner Material	Red PE Film
Liner Thickness	5 mil
Unwind Side Adhesive Strength	15 lb/in
Liner Side Adhesive Strength	15 lb/in
Normal Tensile Strength	100 lb/in²
Maximum Temperature Performance	450°F
Unwind Side Adhesive Permanent	Yes
Liner Side Adhesive Permanent	Yes

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

3M VHB Tape 4646 is a dark gray, 0.025 in general-purpose adhesive tape with firm foam and high temperature resistance. It replaces rivets, welds, and screws, providing strong, permanent bonding and design flexibility for a variety of surfaces.

Bonding applications replacing many rivets, spot welds, liquid adhesives and other permanent fasteners
Often suitable for bonding prior to high temperature paint processing
Stiffener to panel
Panel to frame
Decorative material and trim
Nameplates and logos

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