tesa 4939 Double-Sided PET Film Tape, Transparent, 50 mm x 25 m 04939-00003-11

In demanding industrial assembly, reliable bonding of smooth surfaces is critical. The tesa 4939 double-sided tape delivers high initial tack and excellent long-term adhesion, making it a trusted choice for professionals in electronics, automotive, and signage. With a transparent PET film carrier and a tackified acrylic adhesive, it provides a clean, invisible bond on glass, metal, and high-energy plastics. The white siliconized paper liner ensures easy die-cutting and handling during automated or manual application.

Key specifications

• Carrier: PET film (transparent)
• Adhesive: tackified acrylic
• Total thickness: 200 µm
• Adhesion to steel: 10 N/cm initial, 11 N/cm after 14 days
• Temperature resistance: short-term 100 °C, long-term 70 °C
• Elongation at break: 50%
• Tensile strength: 20 N/cm
• Roll dimensions: 50 mm width × 25 m length

Why choose it

This tape offers a balanced combination of high bond strength, good temperature resistance, and excellent UV and humidity resistance. Its transparent carrier blends seamlessly with clear substrates, while the tackified acrylic adhesive ensures reliable adhesion even on slightly rough or low-surface-energy materials. The siliconized paper liner protects the adhesive until application and allows for precise die-cutting to custom shapes.

Ideal use cases

• Mounting of displays, touch panels, and decorative trim in electronics
• Bonding of nameplates, badges, and emblems in automotive interiors and exteriors
• Joining of transparent plastics, glass, and metal in signage and displays
• General industrial assembly where a thin, high-strength double-sided tape is required

Good to know

For optimal adhesion, surfaces should be clean, dry, and free from dust or grease. The tape performs best when applied at room temperature and with firm pressure. It is suitable for both indoor and outdoor applications due to its UV and humidity resistance. Store in a cool, dry place away from direct sunlight to maintain adhesive properties.