FT 8331 Double Coated Tape
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Long Description
Avery Dennison™ FT 8331 is a 3.6 mil double-coated polyester tape engineered for applications requiring temporary repositionability on one side and permanent bonding performance on the other. This product features a dual rubber adhesive system designed to deliver reliable foam bonding performance while allowing for controlled removability during application setup or alignment.
This construction is ideal for general industrial, automotive, and foam bonding applications where initial repositionability is needed without compromising the final bond strength. FT 8331 is not recommended for use on substrates with low internal strength, such as paper or wallboard, due to the adhesive's high tack and strength.
Key Features
Specially Designed Dual Adhesive System
Repositionable adhesive on the liner side and a permanent, aggressive rubber adhesive on the unwind side.
Polyester (PET) Film Carrier
Provides excellent dimensional stability and supports clean die-cutting and slitting operations.
Repositionable Rubber Adhesive
Allows for temporary bonding, realignment, or positioning during assembly.
Permanent Rubber Adhesive
Offers strong, long-term bonding especially on foams and a variety of other substrates.
Densified Kraft (Neutral Deerback) Liner
Enhances converting performance and adhesive handling.
Benefits
Excellent Foam Bonding Characteristics
Ensures strong adhesion to foams used in automotive, HVAC, appliance, and general assembly applications.
Repositionability Without Compromising Bond
Allows for part adjustment during installation while ensuring secure permanent adhesion afterward.
Converting Friendly
High-quality polyester carrier and liner make it ideal for precision die-cutting and slitting, minimizing waste and improving productivity.
Reliable Performance Across Surfaces
Bonds well to metals, plastics, painted surfaces, and medium to high surface energy substrates.
Construction Overview
| Component | Material |
|---|---|
| Liner | Neutral Deerback Kraft Paper |
| Adhesive 1 (Liner Side) | Repositionable Rubber Adhesive |
| Carrier | Polyester Film |
| Adhesive 2 (Unwind Side) | Permanent Rubber Adhesive |
Physical Properties (Typical Values per ASTM D3652)
| Property | Imperial | Metric |
|---|---|---|
| Liner Thickness | 2.2 mils | 0.056 mm / 56 µm |
| Adhesive 1 (Liner Side) | 1.6 mils | 0.04 mm / 41 µm |
| Carrier Thickness | 0.5 mils | 0.013 mm / 13 µm |
| Adhesive 2 (Unwind Side) | 3.5 mils | 0.09 mm / 89 µm |
| Total Thickness (w/o liner) | 5.5 mils | 0.14 mm / 140 µm |
| Total Thickness (with liner) | 7.1 mils | 0.18 mm / 180 µm |
Performance Characteristics
Peel Adhesion (ASTM D3330 – 180°, 12 in/min @ Room Temp)
| Substrate | Side | Lbf/in | N/m |
|---|---|---|---|
| Stainless Steel | Liner Side | 2.2 | 387 |
| Unwind Side | 4.6 | 810 |
Loop Tack (ASTM D6195 – 180°, 20 in/min)
| Substrate | Side | Lbf/in | N/m |
|---|---|---|---|
| Stainless Steel | Liner Side | 5.5 | 969 |
| Unwind Side | 6.3 | 1,109 |
Static Shear (ASTM D3654 – 1"², 2500g @ Room Temp)
Stainless Steel, Liner Side (Initial): > 1,000 minutes
Stainless Steel, Unwind Side (Initial): > 1,000 minutes
(indicating excellent holding power under stress)
Temperature Performance
| Condition | Temperature |
|---|---|
| Minimum Application Temperature | 50 °F (10 °C) |
| Maximum Continuous Service Temp | 150 °F (65 °C) |
| Maximum Intermittent Temp | 180 °F (82 °C) |
Application Guidelines
Ensure the application surface is clean, dry, and free of grease, dust, or contaminants.
Apply firm pressure to activate adhesive contact for best results.
Note: Repositionable adhesive may not hold effectively on porous or low-strength substrates like drywall or uncoated paper.
Storage & Shelf Life
Shelf Life: 1 year from date of manufacture
Recommended Storage Conditions:
Temperature: 64–72 ºF (18–22 ºC)
Relative Humidity: 30–70%
Keep in original packaging and out of direct sunlight
